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Review

Review of Polymer-Based Composites for Electromagnetic Shielding Application

by
Yuqi Wang
1,2,
Wei Zhao
1,2,
Linli Tan
1,2,*,
Yingru Li
1,2,
Liu Qin
1,2,3 and
Shidong Li
1,2
1
College of Intelligent Systems Science and Engineering, Hubei Minzu University, Enshi 445000, China
2
Key Laboratory of Green Manufacturing of Super-Light Elastomer Materials of State Ethnic Affairs Commission, Hubei Minzu University, Enshi 445000, China
3
Ningbo GMF New Material Technology Co., Ltd., Cixi 315300, China
*
Author to whom correspondence should be addressed.
Molecules 2023, 28(15), 5628; https://doi.org/10.3390/molecules28155628
Submission received: 28 June 2023 / Revised: 19 July 2023 / Accepted: 21 July 2023 / Published: 25 July 2023
(This article belongs to the Section Macromolecular Chemistry)
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Abstract

:
The rapid advancement of electronic communication technology has greatly aided human productivity and quality of life, but it has also resulted in significant electromagnetic pollution issues. Traditional metals and alloys are often used for electromagnetic interference (EMI) shielding due to their excellent electrical conductivity. However, they have drawbacks such as being heavy, expensive, and having low corrosion resistance, which limits their application in electromagnetic shielding. Therefore, it is crucial to develop novel EMI shielding materials. Polymers, being highly flexible, corrosion-resistant, and possessing high specific strength, are frequently employed in electromagnetic shielding materials. In this review, we firstly introduce the basic theory of electromagnetic shielding. Then, we outline the processing methods and recent developments of polymer-based electromagnetic shielding composites, including uniform-, foam-, layered-, and segregated structures. Lastly, we present the challenges and prospects for the field, aiming to provide direction and inspiration for the study of polymer-based electromagnetic shielding composite materials.

Graphical Abstract

1. Introduction

With the rapid advancement of electronic communications and wearable technology in the 5G era [1,2,3], people’s daily lives and productivity have been greatly enhanced. However, this technological progress has also led to a new environmental challenge—electromagnetic radiation pollution, which has raised significant concerns [4,5,6]. Alongside air pollution, noise pollution, and water pollution, electromagnetic radiation pollution has emerged as another major environmental issue [7,8]. Numerous studies have demonstrated that electromagnetic radiation not only disrupts the normal functioning and reduces the longevity of electronic devices but also poses health risks, including the development of various diseases [9,10]. Therefore, whether it is to maintain the normal operation of electronic devices or to protect human health, the study of electromagnetic shielding materials has become a focus of research in recent years [11,12,13]. Metals were initially employed as electromagnetic shielding materials due to their exceptional electrical conductivity [14,15,16], but their disadvantages are also obvious. First of all, metal materials have high density, are not easy to process, and have poor corrosion resistance. Secondly, metal materials mainly shield electromagnetic waves through reflection, which will inevitably cause secondary pollution [17,18,19,20]. These shortcomings limit the application of metal materials in electromagnetic shielding. High-entropy alloys (HEAs) are expected to break the limitations of traditional alloys in the field of electromagnetic shielding. HEAs have excellent mechanical properties, corrosion resistance, and oxidation resistance. These characteristics make HEAs effective electromagnetic shielding materials in extreme environments. In addition, since HEAs are composed of multiple elements, their lattice distortion will lead to a decrease in electrical conductivity, which may change the electromagnetic shielding mechanism of the material from reflection to absorption, thereby reducing the secondary pollution caused by reflection [21,22,23,24,25]. Polymers have attracted extensive attention due to their light weight, good processability, corrosion resistance, and low cost. Researchers are gradually developing polymers as electromagnetic shielding materials [26,27,28]. According to their components and composition, conductive polymer-based EMI shielding materials can be further separated into intrinsic and composite groups.
ICPs (Intrinsically Conductive Polymers) are a class of polymer materials with conjugated π bonds. They include PA (polyacetylene), PANI (polyaniline), PT (polythiophene), and PPy (polypyrrole). After doping, carriers are generated between polymer chains, making them conductive. These materials possess high conductivity, as well as the advantages of light weight, corrosion resistance, and good flexibility of polymer materials [29,30]. However, achieving high conductivity often requires doping, which involves complex preparation processes and high costs. Consequently, they are primarily used in special situations, such as military applications [31]. In contrast, CPCs (Conductive Polymer Composites) offer more advantages. Although the polymers used in CPCs are not conductive, they can be blended with conductive fillers to prepare lightweight, corrosion-resistant, low-cost, and processable electromagnetic shielding materials, allowing for greater flexibility in design [32,33]. Nevertheless, the characteristics of CPCs also present challenges. Increasing the content of conductive filler is necessary to improve the electromagnetic interference shielding effectiveness (EMI SE) of CPCs. However, excessively high filler content can compromise the mechanical properties and processability, and increase production costs. [33,34,35]. To address these issues, researchers have focused on enhancing the structure of CPCs, including foam structures [36,37,38], separated structures [39,40], and layered structures [41,42,43]. These improved CPCs with enhanced structures exhibit superior electromagnetic shielding capabilities and have gained widespread application. Presently, research on CPCs has become a popular topic, especially with the rapid advancement of 5G communication technology and the potential future prospects of 6G technology. As a result, CPCs will play a significant role in the development of EMI shielding technology [44,45,46].
The review discusses the principle of electromagnetic shielding and provides a summary of the research progress in polymer-based electromagnetic shielding composites. It focuses on the structure, preparation methods, and applications of these composites. Furthermore, the article explores the future development prospects of polymer-based EMI materials, aiming to provide valuable insights for professionals in relevant industries.

2. Electromagnetic Shielding Mechanism

The principle of electromagnetic interference (EMI) shielding refers to the ability of EMI materials to absorb, reflect, or weaken electromagnetic waves [47]. There are several theoretical explanations for the electromagnetic shielding process, including the eddy current effect theory, the electromagnetic field theory, and the transmission line theory. The transmission line theory is widely recognized due to its simplicity in calculation, high precision, and ease of understanding. Figure 1 illustrates the specific mechanism [48]. When an electromagnetic wave travels through a material, a portion of the wave is reflected on the surface of the electromagnetic shielding material caused by a discontinuity in the interface impedance (i.e., reflection loss efficiency, SER). A part of the electromagnetic wave enters the material and is continuously attenuated due to loss (i.e., absorption loss efficiency, SEA). A portion of the electromagnetic wave will be dissipated by multiple reflections inside the material (i.e., multiple reflection efficiency, SEM), and the remaining electromagnetic waves will be transmitted in waves after passing through the shielding material. The shielding performance of a material is usually expressed by the shielding efficiency (SE), which can be expressed by Equation (1) [49,50,51,52].
SE = SER + SEA + SEM
EMI SE is strongly associated with the charge, current, and polarization events occurring on the surface and inside the shielding enclosure [53,54]. When an electromagnetic wave is reflected and absorbed by the shielding surface, there is poor impedance matching between the shielding material surface and the free interface, resulting in induced charges in the magnetic field within the shielding material. Therefore, it is necessary for the shielding material to have good conductivity [55,56]. Conductivity is a crucial factor influencing the electromagnetic shielding ability of materials, since higher conductivity generates a larger number of free charges, leading to impedance mismatch and increased reflections. Increased reflection results in a higher SER of the material, subsequently increasing the SE of the material as well [57,58]. When an un-reflected electromagnetic wave enters the shielding material and is absorbed and attenuated, the material contains numerous dipoles that experience orientation polarization within the magnetic field. Hence, the shielding material must possess good magnetic conductivity, excellent electromagnetic loss, and an appropriate dielectric constant [59,60,61,62]; when the remaining electromagnetic wave reaches the transmission edge of the electromagnetic shielding enclosure, it undergoes multiple reflection attenuation. Shielding materials with a porous structure and a large number of interfaces can improve the frequency of multiple reflections and scatterings, thereby effectively enhancing the SE of the materials [63,64,65]. Consequently, an effective electromagnetic shielding material should exhibit both strong reflectivity and efficient electromagnetic wave absorption [66,67].

3. Research Progress of Polymer-Based Composites with Different Structures in the Field of Electromagnetic Shielding

Polymer-based EMI shielding materials have gained significant attention as a viable alternative to traditional metal materials. This is because conventional metals lack corrosion resistance and possess drawbacks such as difficult processing, heavy weight, poor air permeability, high price, and limited control over shielding effectiveness. Consequently, the use of traditional metals is restricted within certain applications [68,69]. Polymer-based materials offer several advantages, including lightweight properties, corrosion resistance, and ease of manufacturing. Moreover, for CPCs, an effective structure (conductive network) provides exceptional conductivity and ultra-high EMI shielding effectiveness. The prevailing polymer-based EMI shielding composites encompass uniform structure, isolation structure, porous structure, and layered structure [33,34,35].

3.1. Uniform Structure

The uniform structure refers to the dispersion of conductive filler in the matrix in a uniform manner. Common methods for preparing EMI shielding materials with such a structure include solution and melt blending, as well as in situ polymerization. These methods are preferred due to their low cost and simplicity. However, this type of material has a significant drawback. To enhance the EMI shielding effectiveness (SE), it is necessary to increase the filler content in the matrix. This, in turn, leads to a high percolation value of the material, ultimately impacting its mechanical properties [70,71,72,73]. Acharya et al. [74] prepared PVDF(polyvinylidene fluoride)/RGO(reduced graphene oxide) electromagnetic shielding composite; when the concentration of the material was 21%, the EMI SE reached 60 dB. Li et al. [75] obtained a POM(polyformaldehyde)/MWCNT(multi-carbon nanotube) composite. The composite, with a concentration of 40%, had an EMI SE of 70 dB. They observed that the electromagnetic interference shielding effectiveness of the material was influenced by the filler content. As the filler content increased in the matrix, the EMI SE of the material improved; however, this enhancement was accompanied by a reduction in its mechanical performance [51,74]. Consequently, it was crucial to modify the filler and develop a novel process to reduce the filler content [76]. Researches on poly-based electromagnetic shielding composites with uniform structure are summarized in Table 1. It is worth mentioning that the frequency range of commonly used electromagnetic waves is 0 to 400 Ghz. Most of the studies on the electromagnetic shielding performance of the polymer matrix composites mentioned in this article were carried out in the frequency range of 8 ∓ 12 Ghz (X-band). This preference is due to the X-band’s low atmospheric attenuation rate, where gas molecules and suspended particles in the atmosphere absorb and scatter electromagnetic waves, resulting in energy attenuation. As a result, the cost of transmitting electromagnetic waves in the X-band is relatively low while maintaining a high throughput. Consequently, the X-band is widely suitable for communication satellites, aviation and marine radars, and military applications [18,77,78].

3.1.1. Solution-Blending Method

The production process of this method can be summarized as follows: Firstly, a suitable solvent is chosen to uniformly disperse or dissolve the conductive filler and the matrix. Next, the solvent is removed, and finally, a uniformly structured electromagnetic shielding material is prepared. Additionally, physical methods such as mechanical agitation or ultrasound are commonly employed in this process [92,98]. Vineeta et al. [83] prepared RGO/PdNi(palladium-nickel)/EVA(ethylene-vinyl acetate copolymer) composite through the solution-blending method. Meher et al. [73] employed the solution-mixing method to blend PANI and PVDF, resulting in a high-quality electromagnetic shielding composite material with a high dielectric constant and a low band gap for light energy. Zhang et al. [87] obtained PMMA(polymethyl methacrylate)/GNP(graphene nanoplatelet)-MWCNT composite via the solution-blending method. They found that the shielding properties of the material increased with an increase in fill content and that the EMI SE of composite with high aspect ratio was higher [73,83,87]. Shakir et al. [71]. used PS(polystyrene) as the matrix and PANI as the conductive filler to prepare PS/PANI composite. They verified the EMI SE of the PS/PANI blend film in the microwave and near-infrared regions. The experimental results proved that the blend had excellent EMI SE in the 9Ghz to 18Ghz band, the measured shielding effect was 45 dB, and the transmittance in the near-infrared region was <1%. Ankur et al. [94]. utilized CB(carbon black) as a nano-filler to fabricate blend composites of EMA (ethylene-co-methyl acrylate) and TPO (thermoplastic polyolefin) through solution blending. At a filler content of 30%, the EMI SE reached 29 dB, exceeding the 15 dB threshold required for commercial applications.
The method requires material compatibility with the solvent; otherwise, the material will not dissolve. Additionally, when using this method to prepare composite materials, the solution will contain a significant amount of solvents that are challenging to completely remove. The presence of these remaining solvents can affect the material’s mechanical properties and potentially harm the environment through volatilization and release into the atmosphere [99,100].

3.1.2. Melt Blending

This is the most frequent approach for producing uniformly structured polymer-based EMI shielding composites. It offers the advantages of being cost-effective and easily processed. In addition, the method is simpler to prepare than the solution-blending method, since no solvent is added to reduce the stickiness of the composites, which leads to the mass production of shielding materials using this method. The preparation process of this method involves pre-mixing the polymer and the filler initially, followed by uniform mixing above the melting flow temperature of the polymer matrix, and finally cooling to obtain the desired polymer-based composite material [101,102,103]. Li et al. [51] prepared two composites, POM/MWCNT and POM/GNP, using melt blending. Their preparation is simple and straightforward and the EMI SE of the composites was higher than commercial requirements. Zeng et al. [86] obtained PLA(polylactic acid)/PEO(polyethylene oxide)/GNP composite through the melt-blending method. Schmitz et al. [91] prepared ABS(acrylonitrile butadiene styrene copolymers)/CB/CNT(carbon nanotube) composite using melt blending. Their research found that increasing the filler led to an increase in conductivity and EMI SE. In addition, they had better physical properties [86,91]. Chen et al. [97] created TPU(thermoplastic polyurethane)/SiAPP(silicon-wrapped ammonium polyphosphate)/SCF(short carbon fiber)/Ti3C2Tx MXene composite with multiple structures. The findings demonstrate that the average EMI SE of the material reached 50.5 dB after adding Ti3C2Tx MXene into the TPU/SiAPP/SCF/composite. This is mainly due to the excellent electrical conductivity of MXene. Aiming at the problem that the current melt blending technology has difficulty endowing polyacrylonitrile with high conductivity, Wang et al. [95] proposed a “two-step dispersion strategy” method, i.e., creating PLA/CNT composite materials using the Pickering emulsion template and masterbatch mixing as a design framework. The results show that the PLA/CNT composite had a low permeation threshold (0.46 vol%) and high electrical conductivity (72.2 S/m) at 5.6% CNT loading. The performance of the material prepared by this method was better than that of the PLA/CNT composite obtained by straight melt mixing. In addition, the composites had an ideal EMI SE (31.1 dB), as shown in Figure 2.
The melt-blending method offers several advantages, including efficient processing, affordability, environmental friendliness, and versatile applications. Consequently, it has found widespread use in both production and experimentation. Nonetheless, the significant shear stress generated during the manufacturing process can damage the filler’s structure, reduce performance, and ultimately compromise the composite material’s electromagnetic interference (EMI) shielding capability [104,105].

3.1.3. In Situ Polymerization Method

This method involves mixing the conducting filler with the polymer thoroughly prior to polymerization. Low shear force is applied through mechanical stirring during the polymerization process to achieve an even distribution of the conductive filler within the polymer matrix. This ultimately yields a polymer-based electromagnetic shielding material with a uniform structure. In contrast to the solution method and the melting method, this approach demonstrates superior dispersion capabilities while minimizing damage to the filler structure. It has also been widely utilized in practical production and experimentation [106]. Mohsina et al. [82] prepared PEDOT(poly-3,4-ethylenedioxythiophene)/GNP composite using an in situ polymerization method. They observed that absorption was the main shielding mechanism of the material, and that PEDOT could absorb more than 90% of electromagnetic waves. Zhang et al. [93] also prepared hetero-structured composite with this method. They found that the heterostructured composite had better EMI SE. This is mainly because of the synergistic effect of interfacial polarization, electrical conductivity, skin depth effect, and heterostructure. Raju et al. [96] synthesized PANI and SWCNT(single-walled carbon nanotube) nanocomposites using the ultrasonic method and in situ polymerization technology. As shown in Figure 3a, the chains of polymers and carbon nanotubes interacted more effectively, and the energy band positions at 1577, 1456, and 1103 cm−1 were slightly changed and the intensity was increased compared with pure PANI and SWCNT, which indicates a p-p interaction between the PANI ring and the graphitic structure of SWCNTS. As shown in Figure 3b, the overall EMI SE improves as the SWCNTs content grows, since increasing the SWCNTs content considerably raises the charge of the carriers, boosting the conductivity of the nanocomposite. When the concentration of SWCNT in the matrix is 3%, the EMI SE value reaches 32.8 dB. However, when the SWCNT content is too high (more than 3 wt%), the total EMI SE declines, which could be due to a lack of network due to the hopping transport mechanism, which impacts carrier transport, conductivity, and SE.
The viscosity of the system gradually increases during the process of preparing composite materials using this method. Despite the minimal shear force created by mechanical stirring, it sufficiently promotes the uniform and sustained distribution of conductive fillers, without altering the filler structure. However, due to the conductive filler’s interfacial contact with the polymer matrix, it is often necessary to modify the filler’s surface to achieve good dispersion, which affects the filler’s physical and chemical properties [107,108,109].

3.2. Foam Structure

Shielding materials with foam structures offer numerous advantages, including anti-aging, corrosion resistance, light weight, and low cost. These materials find applications in various fields, such as aerospace, communication electronics, and military engineering [110,111,112,113]. Compared to other materials, foam-structured EMI shielding composites excel in using a small amount of conductive filler to achieve higher electromagnetic shielding performance, resulting in lower permeability values. Moreover, the hole walls on the surface provide multiple interfaces, allowing for multiple reflections and absorptions of electromagnetic radiation within the material. This property enhances the material’s EMI SE and reduces pollution caused by surface reflection to some extent. There are three primary processes used to create foam structures: physical foaming, chemical foaming, and freeze-drying [114,115,116]. Table 2 shows the recent research progress of foam-structured electromagnetic shielding materials.

3.2.1. Physical Foaming Method

Currently, there are two primary methods of physical foaming. The first method involves fully dissolving the inert gas into the material in an inert gas environment at a specific temperature and pressure, followed by depressurization to form pores inside the material for foaming. The second method utilizes the evaporation and vaporization of a low-boiling liquid within the material through increased temperature to achieve foaming. Among these methods, the supercritical CO2 (sc-CO2) foaming method is the most widely used due to its operability and sustainability [134]. Wang et al. [123] obtained lightweight TPU/MWCNT composite with the sc-CO2 foaming method. Zou et al. [125] combined the sc-CO2 foaming method and annealing treatment to prepare PS/PMMA/MWCNT foam composites with a low percolation threshold. Luo et al. [127] prepared a PBS(poly-butylene succinate)/CNT composite with this method. Their research proves that low-cost, degradable, and good EMI SE composites can be prepared by supercritical carbon dioxide foaming. Bai et al. [132] prepared PVDF/GNPs/CNTs/Ni nanocomposite foam materials using sc-CO2 foaming technology. CNTs and GNPs can enhance the dielectric loss of PVDF composites, whereas Ni can increase the magnetic loss of PVDF composites. Porous structures can also be used to provide multi-interface reflection attenuation. The formation of a nanofiller–nanofiller network in PVDF composite foam raises its dielectric properties and EMI SE (19.4 dB). In another experiment, Bai et al. [133]. obtained ABS/CNTs foam composite prepared with the sc-CO2 method. Compared with pure ABS, the storage modulus and complex viscosity of ABS/CNTs composites were improved by nearly two orders of magnitude, and the electrical conductivity was increased by about nine orders of magnitude. The EMI ratio shielding performance of ABS/CNTs foam improved from 22.75 to 26.6 dB at 145 °C compared to the un-foamed sample. They found that for various ABS foam materials with the same carbon nanotube concentration, the greater the cell size, the larger the specific interface area, and the better the EMI shielding performance.
The physical foaming method is cost-effective, particularly concerning the expenses of CO2 and N2. However, the current research primarily concentrates on the preparation of general-purpose plastics. There is a considerable amount of progress required to apply this technology to engineering plastics.

3.2.2. Chemical Foaming Method

The chemical foaming method involves heating the foaming agent to produce gas, generating cells inside the composite material. Additionally, the chemical reaction between the material’s components can be utilized for foaming. Common chemical blowing agents include sodium chloride, sodium bicarbonate, and nitroso compounds [135]. Some recent studies have used this method to prepare electromagnetic shielding composites [36,117,118,120,126]. Zhu et al. [36] used chemical injection foaming to create a high-strength and lightweight PA6(polyamide 6)/CF(carbon fiber) composite foam. The inclusion of CF enhances the viscoelasticity, melt strength, and foaming ability of PA6/CF composites. The PA6/CF composite foam exhibits the greatest foaming effect and the maximum EMI shielding performance (36.6 dB) when the CF component is 22 wt%. PA6/CF composite foam has higher electromagnetic shielding performance than solid foam, indicating that the cell structure of PA6/CF composite foam helps to improve EMI SE. In addition, the tensile strength, flexural strength, and flexural modulus of PA6/CF composite foam rose as CF content was increased and cell structure was improved. Kim et al. [128]. prepared a MXene/APU(auxetic polyurethane) composite foam. Since APU has a larger specific surface area, this will add another conductive interface, allowing electromagnetic waves to scatter through the skin effect, resulting in a longer propagation distance for electromagnetic waves before transmission, allowing the material to capture more electromagnetic waves and exhibit better EMI SE. The results are shown in Figure 4. Under the same density and electrical conductivity, the EMI shielding efficacy of MXene/APU composite material is 31.2% higher than other similar products, reaching 76.2 dB.
The status of the chemical foaming method closely resembles that of the physical foaming method. It finds primary application in the production of general-purpose plastics and is infrequently employed in the field of engineering plastics.

3.2.3. Freeze-Drying Method

The freeze-drying process is used to control the formation of ice crystals while constructing cell shape on the micro/nano scale. Due to the advantage of controllable multi-scale ordered structure, this method has become an effective means of designing high-performance foam-structured polymer-based EMI shielding materials [136,137]. MWCNT and MCHM (mesoporous carbon hollow microsphere) were employed as conductive fillers, while WPU(water-based polyurethane)/PVA served as the matrix. By regulating the moisture content and freeze-drying, Liang et al. [129] created foam composites. The outcomes demonstrate that changing the density can alter the foam composite’s EMI SE, and the synergistic effect of hollow mesoporous carbon and multi-walled carbon nanotubes can enhance the EMI SE of the composite. When the density was 232.8042 mg cm−3 and MWCNT/WPU was 40 wt%, the electrical conductivity of the composite was 30.2 S m−1, and the EMI shielding efficiency was 23 dB. Wang et al. [130] obtained PDCPD(poly dicyclopentadiene)-CNT/GN EMI shielding composite material with a porous structure. They found that increasing the diameter of the GN in the composite could form a more regular and denser conductive network structure, which makes the material have higher electromagnetic EMI SE. As shown in Figure 5, it could reach 43 dB in the X-band.
To further broaden the application of the freeze-drying method, two challenges need to be addressed. First, it is essential to control ice crystal formation to achieve a suitable structure. Second, this method is applicable only to systems that are soluble or decomposable in water and imposes specific criteria for selecting polymers and fillers [138,139].

3.3. Segregated Structure

The polymer itself has low electrical conductivity, necessitating the continuous addition of conductive fillers to the polymer matrix to impart conductivity. However, excessively high filler content increases costs and processing difficulty, and damages the material’s mechanical properties [140,141,142]. These challenges are effectively addressed by creating polymer-based EMI shielding materials with segregated structures. The isolation structure of these materials ensures that conductive fillers are distributed only between the polymer particle interfaces, preventing them from dispersing freely throughout the matrix. This restricted distribution increases the probability of filler overlap at the interfaces and significantly reduces the percolation threshold. Consequently, even at low filler content, the composite material exhibits strong electrical conductivity and EMI shielding capability [143,144,145]. Research by numerous investigators has demonstrated that the generation of a segregated structure is advantageous for reducing the percolation threshold of the composite, while synergistic filler interactions enhance the material’s shielding ability and mechanical properties [39,40,146,147,148,149]. The recent studies of segregated-structured electromagnetic shielding materials are summarized in Table 3. Zhang et al. [150] prepared PVDF/Fe3O4-RGC composite using layered electrostatic assembly and hot pressing. Wu et al. [151] obtained Fe3O4@PA6/MWCNT composite with layer-adding manufacturing and molding. They found that establishing a separation structure could form a complete conductive network, and adjusting the content of magnetic fillers could effectively improve the EMI SE of the composite. Yang et al. [152] obtained TPU/EG(expanded graphite)/AG(silver) composite material. The inclusion of the Ag component at just 0.58 vol% led to remarkable improvements in the syntactic foam’s conductivity and EMI SE, reaching 171.2 S/m and 56.3 dB, respectively—well exceeding the minimum requirements for commercial EMI shielding. The introduction of a porous structure effectively mitigates the impedance mismatch between the surrounding air and the composite material, facilitating more incident electromagnetic waves and reducing reflectivity. The material’s reflection efficiency in the X-band decreased from 99% to 31%, successfully mitigating secondary electromagnetic wave emission pollution. Additionally, the strong interfacial bonding between the filler and matrix ensures excellent compressibility recovery and shielding stability, even after 50 compression cycles. Wang et al. [153].prepared BPEI(multiblock polyetherimide)/MLG(multilayer graphene) composites. Due to the existence of two blocks with large TG differences in BPEI, the polymer has a high chain mobility, which allows it to inter-diffuse between the BPEI particle interfaces below TK-N, forming a good isolated conductive network. The findings demonstrated that the BPEI/MLG composite loaded with 5.0 wt% MLG generated an isolation structure at a temperature of 270 °C, thereby giving it an electrical conductivity of 313.5 S/m and an EMI shielding performance of 62.2 dB. Ma et al. [154] prepared a CNT/PDMS(polydimethylsiloxane) composite by establishing chemical bonds between them. The cross-linked network of PDMS microspheres prevents the penetration of CNTs into the polymer microcells, resulting in the formation of segregated structures. The results showed that even with only 2.2 vol% of CNT, this composite exhibited exceptional shielding performance at 47.0 dB. Notably, the tensile strength and elongation at break of the composite material reached 3.6 MPa and 87.0%, respectively, marking a substantial increase of 35.0 and 7.0 times compared to traditional isolation composite materials. Additionally, the material exhibited excellent reliability, retaining a high EMI SE of 80% even after undergoing 1000 strain-release cycles at 30% ultimate elongation.
Materials with a segregated structure have garnered considerable interest due to their outstanding EMI shielding performance and remarkably low percolation threshold. However, the distribution of conductive fillers at the polymer particle interface poses challenges, hindering molecular chain diffusion and affecting interface compatibility. Additionally, agglomerated conductive fillers generate micropores along the direction of the conductive path. These adverse circumstances will impact the mechanical characteristics of the polymer-based EMI shielding material with a segregated structure [155,156,157,158]. Yang et al. [159] added SiO2 particles to PDMS, and the EMI SE of the composite was improved due to the volume exclusion effect and multi-interface. However, nanoparticles disrupt conductive networks.
Table
Table 3. Summary of the research on poly-based electromagnetic shielding composites with segregated structure.
Table 3. Summary of the research on poly-based electromagnetic shielding composites with segregated structure.
Materials *Filler LoadingEMI SE (dB)Thickness (mm)FrequencyRef.
Starch/CNT3 vol%33.121.68–12 Ghz[146]
PEBA/CNS composites0.2 wt%333.48–12 Ghz[39]
PS/CNT/PEDOT:PSS6 wt%33.40.68–12 Ghz[147]
PVDF/Fe3O4-RGC2.02 vol%44.5-8–12 Ghz[150]
Fe3O4@PA6/MWCNT9 wt%24.80.58–12 Ghz[151]
BPEI/MLG5 wt%62.22.38–12 Ghz[153]
PP/RGO/MWCNT5 wt%16-8–12 Ghz[145]
PLA/PBS/MWCNT2 wt%27.5628–12 Ghz[148]
PA12/CNT5.66 wt%23.928–12 Ghz[149]
POM/CNT4 wt%21.528–12 Ghz[40]
BN/GNP/PPS40 wt%7038–12 Ghz[157]
SiO2/CNT/PDMS35.4 vol%52.228–12 Ghz[159]
NR/CNT7 wt%44.228–12 Ghz[158]
PBS/CNT2 wt%2428–12 Ghz[142]
CNT/PDMS2.2 vol%4728–12 Ghz[154]
TPU/EG/AG0.58 vol%56.3-8–12 Ghz[152]
* PEBA—polyether block amide; CNS—carbon nanostructures; PSS—polystyrene sulfonate; RGC—reduced graphene oxide/single-wall carbon nanotube; PP—polypropylene; BN—boron nitride nanosheet; PPS—polyphenylene sulfide; NR—natural rubber; EG—expanded graphite.

3.4. Layered Structure

The polymer-based EMI shielding composite material with a layered structure contains multiple interfaces, allowing for repeated reflection of electromagnetic radiation, leading to polarization loss and electromagnetic wave absorption loss [160,161]. This layered structure of EMI shielding material can achieve high electromagnetic shielding performance even with a low content of conductive filler, while offering design flexibility. Typically, polymer-based electromagnetic shielding composites with a layered structure exhibit sandwich and gradient configurations, which can be easily prepared using methods like vacuum filtration and deposition [162,163,164]. Due to their strong absorbing ability, these layered materials find extensive applications in critical fields such as military technology and precision instruments, significantly reducing secondary pollution caused by electromagnetic wave reflection [165,166,167,168]. Yu et al. [169] prepared PI(polyimide)/Ti3C2Tx Mxene/AgNW(silver nanowire) composite through electrostatic spinning and a hot-press approach. Wu et al. [170] obtained PPA6@NiM(magnetic PA6 microspheres)/PDMS composite using the solvent coprecipitation method. Chu et al. [171] prepared h-PANI/CNF/Mxene composite films with the alternating vacuum-assisted filtration method. Guo et al. [172] obtained ANF(aramid nanofiber)/AgNW/GN composite films through a vacuum filtration and hot-press approach. They found that the electromagnetic shielding material with a layered structure exhibited a strong absorbing ability, primarily attributed to the formation of a dense conductive network in the core layer of the material and excellent adhesion between the layers [42,169,170,171,172]. Table 4 shows the recent research of layered-structured electromagnetic shielding materials. Song et al. [173] obtained TPU/MWCNT electromagnetic shielding material with a sandwich structure through the CO2 foaming method. Figure 6 shows that at 2.5% MWCNT content, the average EMI SE exceeded 20 dB (meeting the lowest commercial standard). With 5% MWCNT content, the average EMI SE surpassed 30 dB (shielding over 99% of electromagnetic waves), and achieved maximum SE and absorbance of 53.3 dB and 0.66, respectively. This is attributed to the Fabry–Perot resonance effect, causing attenuation of electromagnetic waves in the electromagnetic shielding material with a sandwich structure and a certain thickness of the middle layer, thereby demonstrating excellent electromagnetic shielding performance.
Liu et al. [174] prepared NiFe2O4/AgNW/EPM(expandable polymer microsphere) composite through the vacuum filtration and hot-pressing method. The resulting asymmetric foam allows electromagnetic radiation to follow the “absorption-reflection-absorption” path, facilitated by the magnetic NiFe2O4/EPM impedance matching layer and the conducting AgNW/EPM shielding layer. The findings demonstrate that the 2 mm thick 10-AgE-10-NFOE foam outperformed other known shielding materials with a remarkable EMI SE of 66.5 dB, an exceptionally low conjugate reflection coefficient of 0.15, and a green shielding index (gs) of 5.67. Additionally, the material exhibited a thermal conductivity of 0.028 W/(m·K), comparable to that of air, signifying good thermal insulation performance. Moreover, the electromagnetic shielding performance remained at 81.2% even after 1000 compression cycles. Xing et al. [175]. obtained MXene/AgNW/MoS2 composite films by vacuum filtration and atomic deposition. The composite film achieves an exceptional maximum shielding value of 86.3 dB in the X-band, despite its mere 0.03 mm thickness. This impressive performance was attributed to the three-dimensional conductive network structure formed by the AgNW skeleton interspersed in the MXene sheet, significantly enhancing conductivity. Furthermore, the presence of a heterogeneous interface between the MXene/AgNW and AgNW layers contributed to an amplified multilayer reflection loss of electromagnetic waves.
Polymer-based electromagnetic shielding composite materials with a layered structure offer significant design freedom, low cost, and strong microwave absorption ability. However, they encounter challenges in actual production [41,176,177]. The bonding of the layers in the layered structure material using physical methods can degrade the compatibility between the layers and may also lead to cracks forming during the bonding process. Consequently, these drawbacks have the potential to restrict the application of multilayer polymer-based electromagnetic shielding materials [43,178].
Table
Table 4. Summary of the research on poly-based electromagnetic shielding composites with layered structure.
Table 4. Summary of the research on poly-based electromagnetic shielding composites with layered structure.
Materials *Filler LoadingEMI SE (dB)Thickness (mm)FrequencyRef.
PI/Ti3C2Tx Mxene/AgNW20 wt%79.540.158–12 Ghz[169]
PLA/MWCNT5 vol%261.524–40 Ghz[41]
PPA6@NiM/PDMS54.9 wt%39.918–12 Ghz[170]
PLLA/GNP/Fe3O410wt%41.70.48–12 Ghz[176]
CF@(CNT/Fe3O4/EP)0.045 wt%30.528–12 Ghz[177]
h-PANI/CNF/Mxene8 wt%35.3-8–12 Ghz[171]
PVDF/SiBi58/Co-C30 vol%5028–12 Ghz[166]
EP/LMPA20 vol%20-8–12 Ghz[161]
SR/Mxene/Fe3O421.2 wt%55.528–12 Ghz[165]
CF/GF/PDMS1 wt%3018–18 Ghz[167]
ANF/AgNW/GN2 vol%68.30.048–12 Ghz[172]
NR/MXene/CNT50 wt%49.90.28–12 Ghz[43]
PEEK/MWCNT20 wt%44.50.568–12 Ghz[42]
TPU/MWCNT5 wt%53.32.48–12 Ghz[173]
NiFe2O4/AgNW/EPM10 wt%66.528–12 Ghz[174]
MXene/AgNW/MoS210 wt%86.30.038–12 Ghz[175]
* LMPA—low-melting-point alloy; SR—silicone rubber; GF—graphene fiber; PEEK—polyether-ether-ketone.

4. Applications of Polymer-Based Electromagnetic Shielding Composites

Electromagnetic waves are vital resources closely intertwined with people’s lives [67,179]. However, the issue of electromagnetic radiation has also caused significant challenges to both human health and the proper functioning of electronic equipment. In response, numerous devices with electromagnetic shielding capabilities have been developed. This paper centers on the exploration of polymer-based EMI shielding composites in both military and civilian applications.

4.1. EMI Shielding Composites in Military Fields

In the military field, EMI shielding composite materials are primarily employed as stealth materials, particularly in aircraft and tank stealth technology [180,181]. Radar, a device using radio waves for target tracking and location determination, operates based on the principle of emitting electromagnetic waves toward the target. Upon hitting the target, some electromagnetic waves are reflected back, and the radar analyzes the echo signal to calculate the target’s position [182]. Reducing electromagnetic wave reflection is crucial in modern warfare to prevent enemy detection of reflected electromagnetic waves and ensure the secrecy of military facilities [183]. There are two primary methods for achieving stealthiness in fighters: specially designing the aircraft’s shape to minimize electromagnetic wave reflection and using materials with wave-absorbing properties. Polymer-based electromagnetic shielding composites have gained increasing usage due to their excellent wave-absorbing ability, lightweight, and corrosion resistance [184]. Teber et al. [185] used PAN(polyacrylonitrile) as the matrix and added metal particles to it to prepare a light-weight radar absorbing material. Chen et al. [186] used SR(silicone rubber) as the matrix and RGO as the filler to prepare a composite material with good radar absorbing ability. In the frequency range of 4–18 Ghz, its absorption capacity could reach up to 37.8 dB. Tank stealth technology comprises camouflage and radar stealth. Camouflage involves using surface coatings and camouflage nets to achieve visual and infrared stealth for tanks. PU(polyurethane) plays a pivotal role in coatings due to its excellent adhesion [187]. Radar stealth means that tanks use wave-absorbing materials or special shapes to reduce electromagnetic wave reflections to achieve stealth effects. Vivek et al. [188] obtained γFe2O3/Ba4Co2Fe36O60-EP(epoxy resin) radar-absorbing composite. In the frequency range of 2–18 Ghz, its maximum absorption rate could reach 98.9%. In addition, studies have shown that materials such as PVC(polyvinyl chloride), PS, and PANI can also have good wave-absorbing capabilities through intelligent processing [189,190].

4.2. EMI Shielding Composites in Civilian Field

In the civilian field, polymer-based electromagnetic shielding composite materials find extensive applications in personal protection, building protection, and equipment protection. Long-term exposure to high-frequency electromagnetic radiation can severely damage people’s cardiovascular and nervous systems [191,192]. Therefore, designing clothing with excellent electromagnetic radiation protection ability offers an effective solution to this problem. PAN, PVA(polyvinyl alcohol), PVDF, and other polymers are widely utilized because they can be processed into conductive fabrics that are highly flexible, lightweight, and possess strong absorbing ability [193,194,195]. Guo et al. [196] prepared TaC(tantalum carbide)/PAN fibers with high strength and excellent flexibility. Its tensile strength can reach up to 9.5 MPa, and its EMI SE can reach 37.7 dB in the X-band. Long et al. [197] obtained Ag-decorated PVA/Fe2O3 nanofiber composites. On the X-band, it had an EMI SE maximum of 45.2 dB. In areas with relatively strong electromagnetic radiation, it is essential to implement appropriate protective measures against electromagnetic radiation pollution. Polymer-based electromagnetic shielding composite materials, known for their excellent wave-absorbing properties, are also employed as wave-absorbing materials in buildings [198,199]. Given the serious interference that electromagnetic waves can cause to electronic equipment in operation, providing electromagnetic protection for such equipment is highly essential. Polymer-based composites emerge as the most suitable protective materials owing to their high absorption, low reflection, broadband capability, lightweight, and high strength [200,201]. Tao et al. [202] prepared CNF(cellulose nanofiber)/MXene/MCHS(mesoporous carbon hollow spheres) composite films for electromagnetic shielding protection. Because MCHS has a porous structure, electromagnetic waves can be reflected multiple times in the pores, which effectively reduces the reflection of electromagnetic waves and effectively reduces the secondary pollution caused by reflection. High-precision equipment benefits from an ideal protection method that involves a combination of reflective and absorbing shielding coatings. Reflective coatings block the entry of external electromagnetic waves, while absorbing coatings neutralize the remaining electromagnetic waves, resulting in an effective electromagnetic shielding effect.

5. Conclusions and Outlook

Based on the above summary, it can be concluded that polymer-based electromagnetic shielding composites are effective for solving electromagnetic radiation and have been widely used. This review focuses on the latest research progress of polymer matrix composites in electromagnetic shielding. Composites with a uniform structure are simple to prepare and have a low cost. However, their EMI SE is generally not particularly high. Improved shielding performance means higher filler content, which may increase the manufacturing cost of the material and deteriorate its mechanical properties. For materials with a uniform structure, conductive fillers with high aspect ratios are commonly used at present, but future research should prioritize developing materials with low conductive filler content while ensuring electrical conductivity. Composite materials with foam structures are widely used in flexible sensors due to their light weight and low density. However, further studies are needed on their mechanical properties, primarily due to their reduced density during the foaming process, which leads to deteriorated mechanical properties due to higher porosity. In the future, adjusting the phase composition and filler distribution to develop lightweight, high-strength foam composites may become an important research direction. The conductive fillers of composites with isolated structures are only distributed between the interfaces of polymer particles, increasing the probability of conductive fillers overlapping at the interface and reducing the percolation threshold. This enables the material to have high conductivity and electromagnetic shielding performance even with low filler content. However, the distribution of conductive fillers at the interface hinders the diffusion of molecular chains between polymers, affecting interface compatibility, and leading to the formation of micro-holes due to gathered conductive fillers along the direction of the conductive path, often resulting in deteriorated mechanical properties. New preparation methods should be developed to address this issue. Layered composites can be designed flexibly, creating multiple functional layers with numerous interfaces that reflect electromagnetic waves multiple times, enhancing polarization loss and absorption loss to improve electromagnetic shielding effectiveness. However, deployment of layered structure polymer-based electromagnetic shielding composites is impacted by compatibility and layer cracking issues. Currently, this problem is often solved by adding an adhesive or introducing an interface-coupling agent, but these additives may pose environmental challenges. For future development, focus should be placed on improving existing additives, aiming for non-toxic, harmless, green, and environmentally friendly solutions. With the continuous development of wireless communication technology and micro-electronic devices, electromagnetic shielding materials with only a single function may not suffice for future needs. The trend for future development lies in lightweight, flexible, super-hydrophobic, ultra-thin, self-healing, corrosion-resistant, flame-retardant, high-strength, and other multi-functional electromagnetic shielding composite materials.

Author Contributions

Data curation, Y.W. and W.Z.; original draft preparation, Y.W.; tables preparation, Y.W. and L.T.; review and editing, Y.L.; visualization, L.Q.; supervision, S.L.; project administration, S.L. and L.T.; funding acquisition, L.T. All authors have read and agreed to the published version of the manuscript.

Funding

This work was supported by the Hubei Minzu University Campus Cultivation project(PY20026), Team Project of Education Department of Hubei Province (T2021013).

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

No new data were created or analyzed in this study. Data sharing is not applicable to this article.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Wan, Y.; Xiong, P.; Liu, J.; Feng, F.; Xun, X.; Gama, F.M.; Zhang, Q.; Yao, F.; Yang, Z.; Luo, H.; et al. Ultrathin, Strong, and Highly Flexible Ti3C2Tx MXene/Bacterial Cellulose Composite Films for High-Performance Electromagnetic Interference Shielding. ACS Nano 2021, 15, 8439–8449. [Google Scholar] [CrossRef]
  2. Zhan, Y.; Oliviero, M.; Wang, J.; Sorrentino, A.; Buonocore, G.G.; Sorrentino, L.; Lavorgna, M.; Xia, H.; Iannace, S. Enhancing the EMI shielding of natural rubber-based supercritical CO2 foams by exploiting their porous morphology and CNT segregated networks. Nanoscale 2019, 11, 1011–1020. [Google Scholar] [CrossRef]
  3. Zhao, B.; Deng, J.; Zhang, R.; Liang, L.; Fan, B.; Bai, Z.; Shao, G.; Park, C.B. Recent Advances on the Electromagnetic Wave Absorption Properties of Ni Based Materials. Eng. Sci. 2018, 3, 5–40. [Google Scholar] [CrossRef] [Green Version]
  4. Chen, X.; Wang, W.; Shi, T.; Wu, G.; Lu, Y. One pot green synthesis and EM wave absorption performance of MoS2@nitrogen doped carbon hybrid decorated with ultrasmall cobalt ferrite nanoparticles. Carbon 2020, 163, 202–212. [Google Scholar] [CrossRef]
  5. Limthin, D.; Klamchuen, A.; Phromyothin, D. Surface modification of superparamagnetic iron oxide nanoparticles and methyl methacrylate molecularly imprinted polymer for gluten detection. Ferroelectrics 2019, 552, 97–107. [Google Scholar] [CrossRef]
  6. Zhang, X.; Zhao, Z.; Xu, J.; Ouyang, Q.; Zhu, C.; Zhang, X.; Zhang, X.; Chen, Y. N-doped carbon nanotube arrays on reduced graphene oxide as multifunctional materials for energy devices and absorption of electromagnetic wave. Carbon 2021, 177, 216–225. [Google Scholar] [CrossRef]
  7. Shao, H.; Wen, Z.; Cheng, P.; Sun, N.; Shen, Q.; Zhou, C.; Peng, M.; Yang, Y.; Xie, X.; Sun, X. Multifunctional power unit by hybridizing contact-separate triboelectric nanogenerator, electromagnetic generator and solar cell for harvesting blue energy. Nano Energy 2017, 39, 608–615. [Google Scholar] [CrossRef]
  8. Xia, L.; Zhang, Y. An overview of world geothermal power generation and a case study on China—The resource and market perspective. Renew. Sustain. Energy Rev. 2019, 112, 411–423. [Google Scholar] [CrossRef]
  9. Joseph, J.; Koroth, A.K.; John, D.A.; Sidpara, A.M.; Paul, J. Highly filled multilayer thermoplastic/graphene conducting composite structures with high strength and thermal stability for electromagnetic interference shielding applications. J. Appl. Polym. Sci. 2019, 136, 47792. [Google Scholar] [CrossRef]
  10. Ma, F.; Yuan, N.; Ding, J. The conductive network made up by the reduced graphene nanosheet/polyaniline/polyvinyl chloride. J. Appl. Polym. Sci. 2012, 128, 3870–3875. [Google Scholar] [CrossRef]
  11. Singh, S.K.; Akhtar, M.J.; Kar, K.K. Hierarchical Carbon Nanotube-Coated Carbon Fiber: Ultra Lightweight, Thin, and Highly Efficient Microwave Absorber. ACS Appl. Mater. Interfaces 2018, 10, 24816–24828. [Google Scholar] [CrossRef] [PubMed]
  12. Wongkasem, N. Electromagnetic pollution alert: Microwave radiation and absorption in human organs and tissues. Electromagn. Biol. Med. 2021, 40, 236–253. [Google Scholar] [CrossRef] [PubMed]
  13. Chen, Y.; Yang, Y.; Xiong, Y.; Zhang, L.; Xu, W.; Duan, G.; Mei, C.; Jiang, S.; Rui, Z.; Zhang, K. Porous aerogel and sponge composites: Assisted by novel nanomaterials for electromagnetic interference shielding. Nano Today 2021, 38, 101204. [Google Scholar] [CrossRef]
  14. Rajavel, K.; Hu, Y.; Zhu, P.; Sun, R.; Wong, C. MXene/metal oxides-Ag ternary nanostructures for electromagnetic interference shielding. Chem. Eng. J. 2020, 399, 125791. [Google Scholar] [CrossRef]
  15. Oh, K.; Hong, S.M.; Seo, Y. Effect of crosslinking reaction on the electromagnetic interference shielding of a Fe-Si-Al alloy (Sendust)/polymer composite at high frequency. Polym. Adv. Technol. 2014, 25, 1366–1370. [Google Scholar] [CrossRef]
  16. Choi, H.K.; Lee, A.; Park, M.; Lee, D.S.; Bae, S.; Lee, S.-K.; Lee, S.H.; Lee, T.; Kim, T.-W. Hierarchical Porous Film with Layer-by-Layer Assembly of 2D Copper Nanosheets for Ultimate Electromagnetic Interference Shielding. ACS Nano 2021, 15, 829–839. [Google Scholar] [CrossRef]
  17. Zhang, C.-S.; Ni, Q.-Q.; Fu, S.-Y.; Kurashiki, K. Electromagnetic interference shielding effect of nanocomposites with carbon nanotube and shape memory polymer. Compos. Sci. Technol. 2007, 67, 2973–2980. [Google Scholar] [CrossRef] [Green Version]
  18. Geetha, S.; Satheesh Kumar, K.K.; Rao, C.R.K.; Vijayan, M.; Trivedi, D.C. EMI shielding: Methods and materials—A review. J. Appl. Polym. Sci. 2009, 112, 2073–2086. [Google Scholar] [CrossRef]
  19. Cao, M.-S.; Wang, X.-X.; Cao, W.-Q.; Yuan, J. Ultrathin graphene: Electrical properties and highly efficient electromagnetic interference shielding. J. Mater. Chem. C 2015, 3, 6589–6599. [Google Scholar] [CrossRef]
  20. Jiang, X.; Li, S.; He, S.; Bai, Y.; Shao, L. Interface manipulation of CO2–philic composite membranes containing designed UiO-66 derivatives towards highly efficient CO2 capture. J. Mater. Chem. A 2018, 6, 15064–15073. [Google Scholar] [CrossRef]
  21. Ye, W.; Xie, M.; Huang, Z.; Wang, H.; Zhou, Q.; Wang, L.; Chen, B.; Wang, H.; Liu, W. Microstructure and tribological properties of in-situ carbide/CoCrFeNiMn high entropy alloy composites synthesized by flake powder metallurgy. Tribol. Int. 2023, 181, 108295. [Google Scholar] [CrossRef]
  22. Hua, D.; Liu, X.; Wang, W.; Zhou, Q.; Xia, Q.; Li, S.; Shi, J.; Wang, H. Formation mechanism of hierarchical twins in the CoCrNi medium entropy alloy. J. Mater. Sci. Technol. 2023, 140, 19–32. [Google Scholar] [CrossRef]
  23. Ren, Y.; Huang, Z.; Wang, Y.; Zhou, Q.; Yang, T.; Li, Q.; Jia, Q.; Wang, H. Friction-induced rapid amorphization in a wear-resistant (CoCrNi)88Mo12 dual-phase medium-entropy alloy at cryogenic temperature. Compos. Part B Eng. 2023, 263, 110833. [Google Scholar] [CrossRef]
  24. Wan, Q.; Hua, K.; Zhou, Z.; Zhang, F.; Wu, H.; Zhou, Q.; Wang, H. Revealing the B addition on tribology performance in TiZrHfTa0.5 refractory high-entropy alloy at ambient and elevated temperature. J. Alloys Compd. 2022, 931, 167521. [Google Scholar] [CrossRef]
  25. Luo, D.; Zhou, Q.; Huang, Z.; Li, Y.; Liu, Y.; Li, Q.; He, Y.; Wang, H. Tribological Behavior of High Entropy Alloy Coatings: A Review. Coatings 2022, 12, 1428. [Google Scholar] [CrossRef]
  26. Zhang, K.; Gu, X.; Dai, Q.; Yuan, B.; Yan, Y.; Guo, M. Flexible polyaniline-coated poplar fiber composite membranes with effective electromagnetic shielding performance. Vacuum 2019, 170, 108990. [Google Scholar] [CrossRef]
  27. Dogan, S.; Kayacan, O.; Goren, A. A lightweight, strength and electromagnetic shielding polymer composite structure for infant carrier strollers. Polym. Compos. 2019, 40, 4559–4572. [Google Scholar] [CrossRef]
  28. Tan, Y.-J.; Li, J.; Cai, J.-H.; Tang, X.-H.; Liu, J.-H.; Hu, Z.-Q.; Wang, M. Comparative study on solid and hollow glass microspheres for enhanced electromagnetic interference shielding in polydimethylsiloxane/multi-walled carbon nanotube composites. Compos. Part B Eng. 2019, 177, 107378. [Google Scholar] [CrossRef]
  29. Zhang, Y.; Qiu, M.; Yu, Y.; Wen, B.; Cheng, L. A Novel Polyaniline-Coated Bagasse Fiber Composite with Core–Shell Heterostructure Provides Effective Electromagnetic Shielding Performance. ACS Appl. Mater. Interfaces 2016, 9, 809–818. [Google Scholar] [CrossRef] [PubMed]
  30. Zhao, H.; Hou, L.; Bi, S.; Lu, Y. Enhanced X-Band Electromagnetic-Interference Shielding Performance of Layer-Structured Fabric-Supported Polyaniline/Cobalt–Nickel Coatings. ACS Appl. Mater. Interfaces 2017, 9, 33059–33070. [Google Scholar] [CrossRef]
  31. Wang, Y.; Jing, X. Intrinsically conducting polymers for electromagnetic interference shielding. Polym. Adv. Technol. 2005, 16, 344–351. [Google Scholar] [CrossRef]
  32. Sun, F.; Xu, J.; Liu, T.; Li, F.; Poo, Y.; Zhang, Y.; Xiong, R.; Huang, C.; Fu, J. An autonomously ultrafast self-healing, highly colourless, tear-resistant and compliant elastomer tailored for transparent electromagnetic interference shielding films integrated in flexible and optical electronics. Mater. Horiz. 2021, 8, 3356–3367. [Google Scholar] [CrossRef]
  33. Nazir, A.; Yu, H.; Wang, L.; Haroon, M.; Ullah, R.S.; Fahad, S.; Naveed, K.-U.-R.; Elshaarani, T.; Khan, A.; Usman, M. Recent progress in the modification of carbon materials and their application in composites for electromagnetic interference shielding. J. Mater. Sci. 2018, 53, 8699–8719. [Google Scholar] [CrossRef]
  34. Wang, L.; Qiu, H.; Liang, C.; Song, P.; Han, Y.; Han, Y.; Gu, J.; Kong, J.; Pan, D.; Guo, Z. Electromagnetic Interference Shielding MWCNT-Fe3O4@Ag/Epoxy Nanocomposites with Satisfactory Thermal Conductivity and High Thermal Stability. Carbon 2018, 141, 506–514. [Google Scholar] [CrossRef]
  35. Wang, L.; Chen, L.; Song, P.; Liang, C.; Lu, Y.; Qiu, H.; Zhang, Y.; Kong, J.; Gu, J. Fabrication on the annealed Ti3C2Tx MXene/Epoxy nanocomposites for electromagnetic interference shielding application. Compos. Part B Eng. 2019, 171, 111–118. [Google Scholar] [CrossRef]
  36. Zhu, N.; Jiang, T.; Zeng, X.; Li, S.; Shen, C.; Zhang, C.; Gong, W.; He, L. High strength and light weight polyamide 6/carbon fiber composite foams for electromagnetic interference shielding. J. Appl. Polym. Sci. 2023, 140, e53818. [Google Scholar] [CrossRef]
  37. Li, J.; Zhang, S.; Wang, L.; Liu, X. In Situ Growth of Fe3O4 Nanoparticles in Poly(arylene ether nitrile)/Graphene/Carbon Nanotube Foams for Electromagnetic Interference Shielding. ACS Appl. Nano Mater. 2023, 6, 7802–7813. [Google Scholar] [CrossRef]
  38. Huang, B.; Yue, J.; Fan, B.; Tang, X.Z.; Liu, Y.; Huang, X. Constructing hierarchical structure via in situ growth of CNT in SiO2-coated carbon foam for high-performance EMI shielding application. Compos. Sci. Technol. 2022, 222, 109372. [Google Scholar] [CrossRef]
  39. Li, X.; Wu, M.; Chen, J.; Zhou, X.; Ren, Q.; Wang, L.; Shen, B.; Zheng, W. A facile and large-scale approach to prepare macroscopic segregated polyether block amides/carbon nanostructures composites with a gradient structure for absorption-dominated electromagnetic shielding with ultra-low reflection. Compos. Commun. 2023, 40, 101628. [Google Scholar] [CrossRef]
  40. Chen, C.; Zhao, X.; Ye, L. Low Percolation Threshold and Enhanced Electromagnetic Interference Shielding in Polyoxymethylene/Carbon Nanotube Nanocomposites with Conductive Segregated Networks. Ind. Eng. Chem. Res. 2022, 61, 3962–3972. [Google Scholar] [CrossRef]
  41. Bertašius, P.; Plyushch, A.; Macutkevič, J.; Banys, J.; Selskis, A.; Platnieks, O.; Gaidukovs, S. Multilayered Composites with Carbon Nanotubes for Electromagnetic Shielding Application. Polymers 2023, 15, 1053. [Google Scholar] [CrossRef] [PubMed]
  42. Wu, T.H.; Mei, X.H.; Liang, L.B.; Ma, Y.M.; Wang, G.B.; Zhang, S.L. Achieving structurally and functionally integrated electromagnetic shielding composites based on polyetheretherketone by sandwich structure. J. Sandw. Struct. Mater. 2021, 24, 484–502. [Google Scholar] [CrossRef]
  43. Wu, H.; Zhu, C.; Li, X.; Hu, X.; Xie, H.; Lu, X.; Qu, J.-P. Layer-by-Layer Assembly of Multifunctional NR/MXene/CNTs Composite Films with Exceptional Electromagnetic Interference Shielding Performances and Excellent Mechanical Properties. Macromol. Rapid Commun. 2022, 43, e2200387. [Google Scholar] [CrossRef] [PubMed]
  44. Ryu, S.H.; Kim, H.; Park, S.-W.; Kwon, S.J.; Kim, S.; Lim, H.-R.; Park, B.; Lee, S.-B.; Choa, Y.-H. Millimeter-Scale Percolated Polyethylene/Graphene Composites for 5G Electromagnetic Shielding. ACS Appl. Nano Mater. 2022, 5, 8429–8439. [Google Scholar] [CrossRef]
  45. Zhang, Y.; Gu, J. A Perspective for Developing Polymer-Based Electromagnetic Interference Shielding Composites. Nano-Micro Lett. 2022, 14, 1–9. [Google Scholar] [CrossRef]
  46. Zhao, B.; Hamidinejad, M.; Wang, S.; Bai, P.; Che, R.; Zhang, R.; Park, C.B. Advances in electromagnetic shielding properties of composite foams. J. Mater. Chem. A 2021, 9, 8896–8949. [Google Scholar] [CrossRef]
  47. Shukla, V. Review of electromagnetic interference shielding materials fabricated by iron ingredients. Nanoscale Adv. 2019, 1, 1640–1671. [Google Scholar] [CrossRef]
  48. Sankaran, S.; Deshmukh, K.; Ahamed, M.B.; Khadheer Pasha, S.K. Recent advances in electromagnetic interference shielding properties of metal and carbon filler reinforced flexible polymer composites: A review. Compos. Part A Appl. Sci. Manuf. 2018, 114, 49–71. [Google Scholar] [CrossRef]
  49. Wang, L.; Song, P.; Lin, C.-T.; Kong, J.; Gu, J. 3D Shapeable, Superior Electrically Conductive Cellulose Nanofibers/Ti3C2Tx MXene Aerogels/Epoxy Nanocomposites for Promising EMI Shielding. Research 2020, 2020, 4093732. [Google Scholar] [CrossRef]
  50. Ji, H.; Zhao, R.; Zhang, N.; Jin, C.; Lu, X.; Wang, C. Lightweight and flexible electrospun polymer nanofiber/metal nanoparticle hybrid membrane for high-performance electromagnetic interference shielding. NPG Asia Mater. 2018, 10, 749–760. [Google Scholar] [CrossRef]
  51. Wang, H.; Li, S.; Liu, M.; Li, J.; Zhou, X. Review on Shielding Mechanism and Structural Design of Electromagnetic Interference Shielding Composites. Macromol. Mater. Eng. 2021, 306, 2100032. [Google Scholar] [CrossRef]
  52. Omana, L.; Chandran, A.; John, R.E.; Wilson, R.; George, K.C.; Unnikrishnan, N.V.; Varghese, S.S.; George, G.; Simon, S.M.; Paul, I. Recent Advances in Polymer Nanocomposites for Electromagnetic Interference Shielding: A Review. ACS Omega 2022, 7, 25921–25947. [Google Scholar] [CrossRef]
  53. Abdi, M.M.; Kassim, A.B.; Ekramul Mahmud, H.N.M.; Yunus, W.M.M.; Talib, Z.A. Electromagnetic Interference Shielding Effectiveness of New Conducting Polymer Composite. J. Macromol. Sci. Part A 2009, 47, 71–75. [Google Scholar] [CrossRef] [Green Version]
  54. Rathi, V.; Panwar, V. Electromagnetic Interference Shielding Analysis of Conducting Composites in Near- and Far-Field Region. IEEE Trans. Electromagn. Compat. 2018, 60, 1795–1801. [Google Scholar] [CrossRef]
  55. Xu, W.; Pan, Y.-F.; Wei, W.; Wang, G.-S. Nanocomposites of Oriented Nickel Chains with Tunable Magnetic Properties for High-Performance Broadband Microwave Absorption. ACS Appl. Energy Mater. 2018, 1, 1116–1123. [Google Scholar] [CrossRef]
  56. Gargama, H.; Thakur, A.K.; Chaturvedi, S.K. Polyvinylidene fluoride/nanocrystalline iron composite materials for EMI shielding and absorption applications. J. Alloys Compd. 2016, 654, 209–215. [Google Scholar] [CrossRef]
  57. Tian, D.; Xu, Y.; Wang, Y.; Lei, Z.; Lin, Z.; Zhao, T.; Hu, Y.; Sun, R.; Wong, C.-P. In-Situ Metallized Carbon Nanotubes/Poly(Styrene-Butadiene-Styrene) (CNTs/SBS) Foam for Electromagnetic Interference Shielding. Chem. Eng. J. 2021, 420, 130482. [Google Scholar] [CrossRef]
  58. Chen, M.; Zhang, L.; Duan, S.; Jing, S.; Jiang, H.; Luo, M.; Li, C. Highly conductive and flexible polymer composites with improved mechanical and electromagnetic interference shielding performances. Nanoscale 2014, 6, 3796–3803. [Google Scholar] [CrossRef]
  59. Kamkar, M.; Ghaffarkhah, A.; Hosseini, E.; Amini, M.; Ghaderi, S.; Arjmand, M. Multilayer polymeric nanocomposites for electromagnetic interference shielding: Fabrication, mechanisms, and prospects. New J. Chem. 2021, 45, 21488–21507. [Google Scholar] [CrossRef]
  60. Kumar, R.; Choudhary, H.K.; Pawar, S.P.; Bose, S.; Sahoo, B. Carbon encapsulated nanoscale iron/iron-carbide/graphite particles for EMI shielding and microwave absorption. Phys. Chem. Chem. Phys. 2017, 19, 23268–23279. [Google Scholar] [CrossRef]
  61. Manna, K.; Srivastava, S.K. Tuning of Shells in Trilaminar Core@Shell Nanocomposites in Controlling Electromagnetic Interference through Switching of the Shielding Mechanism. Langmuir 2020, 36, 4519–4531. [Google Scholar] [CrossRef]
  62. Ayub, S.; Guan, B.H.; You, K.Y. Electromagnetic Interference Shielding Mechanisms of MMG@PVDF Composites for a Broadband Frequency Range. Mater. Today Commun. 2023, 35, 106273. [Google Scholar] [CrossRef]
  63. Han, T.; Luo, R. Effect of carbon nanotubes on the electromagnetic shielding properties of SiC f /SiC composites. J. Alloys Compd. 2018, 745, 90–99. [Google Scholar] [CrossRef]
  64. Hu, X.-S.; Shen, Y.; Lu, L.-S.; Xu, J.; Zhen, J.-J. Enhanced electromagnetic interference shielding effectiveness of ternary PANI/CuS/RGO composites. J. Mater. Sci. Mater. Electron. 2017, 28, 6865–6872. [Google Scholar] [CrossRef]
  65. Zhao, Z.J.; Zhang, B.Y.; Du, Y.; Hei, Y.W.; Yi, X.S.; Shi, F.H.; Xian, G.J. MWCNT modified structure-conductive composite and its electromagnetic shielding behavior. Compos. Part B Eng. 2017, 130, 21–27. [Google Scholar] [CrossRef]
  66. Bera, R.; Das, A.K.; Maitra, A.; Paria, S.; Karan, S.K.; Khatua, B.B. Salt leached viable porous Fe3O4 decorated polyaniline—SWCNH/PVDF composite spectacles as an admirable electromagnetic shielding efficiency in extended Ku-band region. Compos. Part B Eng. 2017, 129, 210–220. [Google Scholar] [CrossRef]
  67. Liang, J.; Wang, Y.; Huang, Y.; Ma, Y.; Liu, Z.; Cai, J.; Zhang, C.; Gao, H.; Chen, Y. Electromagnetic interference shielding of graphene/epoxy composites. Carbon 2009, 47, 922–925. [Google Scholar] [CrossRef]
  68. Byeon, J.H.; Kim, J.-W. Aerosol based fabrication of a Cu/polymer and its application for electromagnetic interference shielding. Thin Solid Film. 2011, 520, 1048–1052. [Google Scholar] [CrossRef]
  69. Okazaki, Y.; Ueno, K. Magnetic shielding by soft magnetic materials in alternating magnetic field. J. Magn. Magn. Mater. 1992, 112, 192–194. [Google Scholar] [CrossRef]
  70. Gahlout, P.; Choudhary, V. EMI shielding response of polypyrrole-MWCNT/polyurethane composites. Synth. Met. 2020, 266, 116414. [Google Scholar] [CrossRef]
  71. Shakir, M.F.; Abdul Rashid, I.; Tariq, A.; Nawab, Y.; Afzal, A.; Nabeel, M.; Naseem, A.; Hamid, U. EMI Shielding Characteristics of Electrically Conductive Polymer Blends of PS/PANI in Microwave and IR Region. J. Electron. Mater. 2020, 49, 1660–1665. [Google Scholar] [CrossRef]
  72. Li, X.; Xu, T.; Cao, W.; Wang, M.; Chen, F.; Jin, L.; Song, N.; Sun, S.; Ding, P. Graphene/carbon fiber network constructed by co-carbonization strategy for functional integrated polyimide composites with enhanced electromagnetic shielding and thermal conductive properties. Chem. Eng. J. 2023, 464, 142595. [Google Scholar] [CrossRef]
  73. Meher, D.; Suman, N.; Karna, N.; Sahoo, B.P. Development of Poly (vinylidene fluoride) and Polyaniline blend with high dielectric permittivity, excellent electromagnetic shielding effectiveness and Ultra low optical energy band gap: Effect of ionic liquid and temperature. Polymer 2019, 181, 121759. [Google Scholar] [CrossRef]
  74. Acharya, S.; Datar, S. Wideband (8–18 GHz) microwave absorption dominated electromagnetic interference (EMI) shielding composite using copper aluminum ferrite and reduced graphene oxide in polymer matrix. J. Appl. Phys. 2020, 128, 104902. [Google Scholar] [CrossRef]
  75. Li, J.; Wang, Y.; Yue, T.-N.; Gao, Y.-N.; Shi, Y.-D.; Shen, J.-B.; Wu, H.; Wang, M. Robust electromagnetic interference shielding, joule heating, thermal conductivity, and anti-dripping performances of polyoxymethylene with uniform distribution and high content of carbon-based nanofillers. Compos. Sci. Technol. 2021, 206, 108681. [Google Scholar] [CrossRef]
  76. Li, T.; Zhao, G.; Wang, G. Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites. Polym. Compos. 2018, 40, E1786–E1800. [Google Scholar] [CrossRef]
  77. Chung, D.D.L. Carbon materials for structural self-sensing, electromagnetic shielding and thermal interfacing. Carbon 2012, 50, 3342–3353. [Google Scholar] [CrossRef]
  78. Gupta, S.; Tai, N.-H. Carbon Materials and Their Composites for Electromagnetic Interference Shielding Effectiveness in X-band. Carbon 2019, 152, 159–187. [Google Scholar] [CrossRef]
  79. Khodiri, A.A.; Al-Ashry, M.Y.; El-Shamy, A.G. Novel hybrid nanocomposites based on polyvinyl alcohol/graphene/magnetite nanoparticles for high electromagnetic shielding performance. J. Alloys Compd. 2020, 847, 156430. [Google Scholar] [CrossRef]
  80. Zhang, H.; Heng, Z.; Zhou, J.; Shi, Y.; Chen, Y.; Zou, H.; Liang, M. In-situ co-continuous conductive network induced by carbon nanotubes in epoxy composites with enhanced electromagnetic interference shielding performance. Chem. Eng. J. 2020, 398, 125559. [Google Scholar] [CrossRef]
  81. Serrato, V.M.; Padilla, V.; Jones, D.; Herrera, S.; Campos, L.; Serrato, I.; Foltz, H.; Lozano, K. Electromagnetic interference shielding effectiveness of compression molded carbon nanofiber-reinforced polyvinylidene difluoride film. Polym. Compos. 2022, 44, 592–608. [Google Scholar] [CrossRef]
  82. Mohsina, T.; Manohara, S.R.; Siddlingeshwar, B.; Narasimha, R.; Muhammad, F.; Khadke, U.V. Anticorrosion and electromagnetic interference shielding performance of bifunctional PEDOT-graphene nanocomposites. Diam. Relat. Mater. 2023, 132, 109690. [Google Scholar]
  83. Vineeta, S.; Sanjeev, K.S. Reduced graphene oxide/PdNi/poly(ethylene-co-vinyl acetate) nanocomposites for electromagnetic interference shielding. Mater. Chem. Phys. 2021, 276, 125418. [Google Scholar]
  84. Zhao, Y.; Hou, J.; Bai, Z.; Yang, Y.; Guo, X.; Cheng, H.; Zhao, Z.; Zhang, X.; Chen, J.; Shen, C. Facile preparation of lightweight PE/PVDF/Fe3O4/CNTs nanocomposite foams with high conductivity for efficient electromagnetic interference shielding. Compos. Part A Appl. Sci. Manuf. 2020, 139, 106095. [Google Scholar] [CrossRef]
  85. Kuang, T.; Chang, L.; Chen, F.; Sheng, Y.; Fu, D.; Peng, X. Facile preparation of lightweight high-strength biodegradable polymer/multi-walled carbon nanotubes nanocomposite foams for electromagnetic interference shielding. Carbon 2016, 105, 305–313. [Google Scholar] [CrossRef]
  86. Zeng, Q.; Du, Z.; Qin, C.; Wang, Y.; Liu, C.; Shen, C. Enhanced thermal, mechanical and electromagnetic interference shielding properties of graphene nanoplatelets-reinforced poly(lactic acid)/poly(ethylene oxide) nanocomposites. Mater. Today Commun. 2020, 25, 101632. [Google Scholar] [CrossRef]
  87. Zhang, H.; Zhang, G.; Tang, M.; Zhou, L.; Li, J.; Fan, X.; Shi, X.; Qin, J. Synergistic effect of carbon nanotube and graphene nanoplates on the mechanical, electrical and electromagnetic interference shielding properties of polymer composites and polymer composite foams. Chem. Eng. J. 2018, 353, 381–393. [Google Scholar] [CrossRef]
  88. Ni, J.; Zhan, R.; Qiu, J.; Fan, J.; Dong, B.; Guo, Z. Multi-interfaced graphene aerogel/polydimethylsiloxane metacomposites with tunable electrical conductivity for enhanced electromagnetic interference shielding. J. Mater. Chem. C 2020, 8, 11748–11759. [Google Scholar] [CrossRef]
  89. Chakraborty, T.; Debnath, T.; Bhowmick, S.; Bandyopadhyay, A.; Karmakar, A.; Das, S.; Mahapatra, A.S.; Sutradhar, S. Enhancement of EMI shielding effectiveness of flexible Co2U-type hexaferrite (Ba4Co2Fe36O60)-poly(vinylidene fluoride) heterostructure composite materials: An improved radar absorbing material to combat against electromagnetic pollution. J. Appl. Phys. 2020, 128, 095301. [Google Scholar] [CrossRef]
  90. Cheng, Z.; Cao, Y.; Wang, R.; Xia, L.; Ma, S.; Li, Z.; Cai, Z.; Zhang, Z.; Huang, Y. Hierarchical Surface Engineering of Carbon Fiber for Enhanced Composites Interfacial Properties and Microwave Absorption Performance. Carbon 2021, 185, 669–680. [Google Scholar] [CrossRef]
  91. Schmitz, D.P.; Silva, T.I.; Ramoa, S.D.A.S.; Barra, G.M.O.; Pegoretti, A.; Soares, B.G. Hybrid composites of ABS with carbonaceous fillers for electromagnetic shielding applications. J. Appl. Polym. Sci. 2018, 135, 46546. [Google Scholar] [CrossRef]
  92. George, G.; Simon, S.M.; Prakashan, V.P.; Sajna, M.S.; Faisal, M.; Chandran, A.; Wilson, R.; Biju, P.R.; Joseph, C.; Unnikrishnan, N.V. Morphological, dielectric, tunable electromagnetic interference shielding and thermal characteristics of multiwalled carbon nanotube incorporated polymer nanocomposites: A facile, environmentally benign and cost effective approach realized via polymer latex/waterborne polymer as matrix. Polym. Compos. 2017, 39, E1169–E1183. [Google Scholar] [CrossRef]
  93. Zhang, Y.; Yang, Z.; Yu, Y.; Wen, B.; Liu, Y.; Qiu, M. Tunable Electromagnetic Interference Shielding Ability in a One-Dimensional Bagasse Fiber/Polyaniline Heterostructure. ACS Appl. Energy Mater. 2019, 1, 737–745. [Google Scholar] [CrossRef]
  94. Ankur, K.; Palash, D.; Sangit, P.; Krishnendu, N.; Suman Kumar, G.; Narayan, C.D. Preferential localization of conductive filler in ethylene-co-methyl acrylate/thermoplastic polyolefin polymer blends to reduce percolation threshold and enhanced electromagnetic radiation shielding over K band region. Polym. Compos. 2022, 44, 1603–1616. [Google Scholar]
  95. Wang, Y.; Yang, C.; Xin, Z.; Luo, Y.; Wang, B.; Feng, X.; Mao, Z.; Sui, X. Poly(lactic acid)/carbon nanotube composites with enhanced electrical conductivity via a two-step dispersion strategy. Compos. Commun. 2022, 30, 101087. [Google Scholar] [CrossRef]
  96. Raju, P.; Rani, G.N.; Kumar, S.U.; Andrews, J.; Raju, K.C.J. Ultrasonically induced in situ polymerization of PANI-SWCNT nanocomposites for electromagnetic shielding applications. J. Mater. Sci. Mater. Electron. 2022, 33, 5138–5148. [Google Scholar] [CrossRef]
  97. Chen, K.; Feng, Y.; Shi, Y.; Wang, H.; Fu, L.; Liu, M.; Lv, Y.; Yang, F.; Yu, B.; Liu, M.; et al. Flexible and fire safe sandwich structured composites with superior electromagnetic interference shielding properties. Compos. Part A Appl. Sci. Manuf. 2022, 160, 107070. [Google Scholar] [CrossRef]
  98. Marka, S.K.; Sindam, B.; James Raju, K.C.; Srikanth, V.V.S.S. Flexible few-layered graphene/poly vinyl alcohol composite sheets: Synthesis, characterization and EMI shielding in X-band through the absorption mechanism. RSC Adv. 2015, 5, 36498–36506. [Google Scholar] [CrossRef]
  99. Park, Y.; Baeg, K.-J.; Kim, C. Solution-Processed Nonvolatile Organic Transistor Memory Based on Semiconductor Blends. ACS Appl. Mater. Interfaces 2019, 11, 8327–8336. [Google Scholar] [CrossRef]
  100. Leydecker, T.; Squillaci, M.A.; Liscio, F.; Orgiu, E.; Samorì, P. Controlling Ambipolar Transport and Voltage Inversion in Solution-Processed Thin-Film Devices through Polymer Blending. Chem. Mater. 2018, 31, 6491–6498. [Google Scholar] [CrossRef]
  101. Duan, H.; Yang, J.; Yang, Y.; Zhao, G.; Liu, Y. TiO2 hybrid polypropylene/nickel coated glass fiber conductive composites for highly efficient electromagnetic interference shielding. J. Mater. Sci. Mater. Electron. 2016, 28, 5725–5732. [Google Scholar] [CrossRef]
  102. Na, R.; Liu, J.; Wang, G.; Zhang, S. Light weight and flexible poly(ether ether ketone) based composite film with excellent thermal stability and mechanical properties for wide-band electromagnetic interference shielding. RSC Adv. 2018, 8, 3296–3303. [Google Scholar] [CrossRef] [PubMed]
  103. Sharika, T.; Abraham, J.; Arif, P.M.; George, S.C.; Kalarikkal, N.; Thomas, S. Excellent electromagnetic shield derived from MWCNT reinforced NR/PP blend nanocomposites with tailored microstructural properties. Compos. Part B Eng. 2019, 173, 106798. [Google Scholar] [CrossRef]
  104. Naz, A.; Kausar, A.; Siddiq, M. Influence of Graphite Filler on Physicochemical Characteristics of Polymer/Graphite Composites: A Review. Polym. -Plast. Technol. Mater. 2015, 55, 604–625. [Google Scholar] [CrossRef]
  105. Chen, W.; Hu, W.; Li, D.; Chen, S.; Dai, Z. A critical review on the development and performance of polymer/graphene nanocomposites. Sci. Eng. Compos. Mater. 2018, 25, 1059–1073. [Google Scholar] [CrossRef] [Green Version]
  106. Yun, J.; Kim, H.-I. Electromagnetic interference shielding effects of polyaniline-coated multi-wall carbon nanotubes/maghemite nanocomposites. Polym. Bull. 2011, 68, 561–573. [Google Scholar] [CrossRef]
  107. Loste, J.; Lopez-Cuesta, J.-M.; Billon, L.; Garay, H.; Save, M. Transparent polymer nanocomposites: An overview on their synthesis and advanced properties. Prog. Polym. Sci. 2018, 89, 133–158. [Google Scholar] [CrossRef]
  108. Harito, C.; Bavykin, D.V.; Yuliarto, B.; Dipojono, H.K.; Walsh, F.C. Polymer nanocomposites having a high filler content: Synthesis, structures, properties, and applications. Nanoscale 2019, 11, 4653–4682. [Google Scholar] [CrossRef] [PubMed]
  109. Guo, Y.; Yang, X.; Ruan, K.; Kong, J.; Dong, M.; Zhang, J.; Gu, J.; Guo, Z. Reduced Graphene Oxide Heterostructured Silver Nanoparticles Significantly Enhanced Thermal Conductivities in Hot-Pressed Electrospun Polyimide Nanocomposites. ACS Appl. Mater. Interfaces 2019, 11, 25465–25473. [Google Scholar] [CrossRef]
  110. Wan, Y.-J.; Zhu, P.-L.; Yu, S.-H.; Sun, R.; Wong, C.-P.; Liao, W.-H. Anticorrosive, Ultralight, and Flexible Carbon-Wrapped Metallic Nanowire Hybrid Sponges for Highly Efficient Electromagnetic Interference Shielding. Small 2018, 14, 1800534. [Google Scholar] [CrossRef]
  111. Zeng, Z.; Zhang, Y.; Ma, X.; Shahabadi, S.I.S.; Che, B.; Wang, P.; Lu, X. Biomass-based honeycomb-like architectures for preparation of robust carbon foams with high electromagnetic interference shielding performance. Carbon 2018, 140, 227–236. [Google Scholar] [CrossRef]
  112. Sun, Y.; Luo, S.; Sun, H.; Zeng, W.; Ling, C.; Chen, D.; Chan, V.; Liao, K. Engineering closed-cell structure in lightweight and flexible carbon foam composite for high-efficient electromagnetic interference shielding. Carbon 2018, 136, 299–308. [Google Scholar] [CrossRef]
  113. Dhakate, S.R.; Subhedar, K.M.; Singh, B.P. Polymer nanocomposite foam filled with carbon nanomaterials as an efficient electromagnetic interference shielding material. RSC Adv. 2015, 5, 43036–43057. [Google Scholar] [CrossRef]
  114. Li, M.; Xu, Q.; Jiang, W.; Farooq, A.; Qi, Y.; Liu, L. Preparation and Investigation of Fe3O4@rGO/CNF Foams for Electromagnetic Interference Shielding. Fibers Polym. 2023, 24, 771–778. [Google Scholar] [CrossRef]
  115. Xu, Y.; Li, Y.; Hua, W.; Zhang, A.; Bao, J. Light-Weight Silver Plating Foam and Carbon Nanotube Hybridized Epoxy Composite Foams with Exceptional Conductivity and Electromagnetic Shielding Property. ACS Appl. Mater. Interfaces 2016, 8, 24131–24142. [Google Scholar] [CrossRef]
  116. Ling, J.; Zhai, W.; Feng, W.; Shen, B.; Zhang, J.; Zheng, W.G. Facile Preparation of Lightweight Microcellular Polyetherimide/Graphene Composite Foams for Electromagnetic Interference Shielding. ACS Appl. Mater. Interfaces 2013, 5, 2677–2684. [Google Scholar] [CrossRef]
  117. Oraby, H.; Naeem, I.; Darwish, M.; Senna, M.H.; Tantawy, H.R. Electromagnetic interference shielding of thermally exfoliated graphene/polyurethane composite foams. J. Appl. Polym. Sci. 2022, 139, 53008. [Google Scholar] [CrossRef]
  118. Chen, J.; Jiang, W.J.; Zeng, Z.; Sun, D.X.; Qi, X.D.; Yang, J.H.; Wang, Y. Multifunctional shape memory foam composites integrated with tunable electromagnetic interference shielding and sensing. Chem. Eng. J. 2023, 466, 143373. [Google Scholar] [CrossRef]
  119. Li, Z.; Sun, Y.; Zhou, B.; Feng, Y.; Liu, C.; Shen, C. Flexible thermoplastic polyurethane/MXene foams for compressible electromagnetic interference shielding. Mater. Today Phys. 2023, 32, 101017. [Google Scholar] [CrossRef]
  120. Liu, H.; Zhu, Z.; Tian, N.; Li, Y.; You, C.; Islam, S.M. Synergistically-enhanced flexible electromagnetic interference shielding nanocomposites. Appl. Surf. Sci. 2023, 628, 157379. [Google Scholar] [CrossRef]
  121. Lee, C.W.; Lin, C.H.; Wang, L.Y.; Lee, Y.H. Developing sustainable and recyclable high-efficiency electromagnetic interference shielding nanocomposite foams from the upcycling of recycled poly(ethylene terephthalate). Chem. Eng. J. 2023, 468, 143447. [Google Scholar] [CrossRef]
  122. Oraby, H.; Naeem, I.; Darwish, M.; Senna, M.H.; Tantawy, H.R. Optimization of electromagnetic shielding and mechanical properties of reduced graphene oxide/polyurethane composite foam. Polym. Eng. Sci. 2022, 62, 3075–3087. [Google Scholar] [CrossRef]
  123. Wang, X.; Wang, G.; He, G.; Liao, X.; Song, P.; Zou, F.; Liu, S.; Luo, Y.; Li, G. Fabrication of lightweight flexible thermoplastic polyurethane/multiwalled carbon nanotubes composite foams for adjustable frequency-selective electromagnetic interference shielding by supercritical carbon dioxide. J. Supercrit. Fluids 2022, 188, 105675. [Google Scholar] [CrossRef]
  124. Dun, D.; Luo, J.; Wang, M.; Wang, X.; Zhou, H.; Wang, X.; Wen, B.; Zhang, Y. Electromagnetic Interference Shielding Foams Based on Poly(vinylidene fluoride)/Carbon Nanotubes Composite. Macromol. Mater. Eng. 2021, 306, 2100468. [Google Scholar] [CrossRef]
  125. Zou, F.; Chen, J.; Liao, X.; Song, P.; Li, G. Efficient electrical conductivity and electromagnetic interference shielding performance of double percolated polymer composite foams by phase coarsening in supercritical CO2. Compos. Sci. Technol. 2021, 213, 108895. [Google Scholar] [CrossRef]
  126. Shen, Y.; Lin, Z.; Liu, X.; Zhao, T.; Zhu, P.; Zeng, X.; Hu, Y.; Sun, R.; Wong, C.-P. Robust and flexible silver-embedded elastomeric polymer/carbon black foams with outstanding electromagnetic interference shielding performance. Compos. Sci. Technol. 2021, 213, 108942. [Google Scholar] [CrossRef]
  127. Luo, J.; Yin, D.; Yu, K.; Zhou, H.; Wen, B.; Wang, X. Facile Fabrication of PBS/CNTs Nanocomposite Foam for Electromagnetic Interference Shielding. ChemPhysChem 2022, 23, 202100778. [Google Scholar] [CrossRef]
  128. Kim, E.; Zhang, H.; Lee, J.-H.; Chen, H.; Zhang, H.; Javed, M.H.; Shen, X.; Kim, J.-K. MXene/polyurethane auxetic composite foam for electromagnetic interference shielding and impact attenuation. Compos. Part A Appl. Sci. Manuf. 2021, 147, 106430. [Google Scholar] [CrossRef]
  129. Liang, S.; Qin, Y.; Gao, W.; Wang, M. A lightweight polyurethane-carbon microsphere composite foam for electromagnetic shielding. e-Polymers 2022, 22, 223–233. [Google Scholar] [CrossRef]
  130. Wang, P.; Yang, L.; Ling, J.; Song, J.; Song, T.; Chen, X.; Gao, S.; Feng, S.; Ding, Y.; Murugadoss, V.; et al. Frontal ring-opening metathesis polymerized polydicyclopentadiene carbon nanotube/graphene aerogel composites with enhanced electromagnetic interference shielding. Adv. Compos. Hybrid Mater. 2022, 5, 2066–2077. [Google Scholar] [CrossRef]
  131. Xia, B.; Zhang, X.; Jiang, J.; Wang, Y.; Li, T.; Wang, Z.; Chen, M.; Liu, T.; Dong, W. Facile preparation of high strength, lightweight and thermal insulation Polyetherimide/Ti3C2Tx MXenes/Ag nanoparticles composite foams for electromagnetic interference shielding. Compos. Commun. 2021, 29, 101028. [Google Scholar] [CrossRef]
  132. Bai, Y.A.; Wei, X.; Dun, D.; Bai, S.; Zhou, H.; Wen, B.; Wang, X.; Hu, J. Lightweight poly(vinylidene fluoride) based quaternary nanocomposite foams with efficient and tailorable electromagnetic interference shielding properties. Polym. Compos. 2023, 44, 1951–1966. [Google Scholar] [CrossRef]
  133. Bai, Y.A.; Zheng, K.; Cui, W.; Luo, J.; Zhou, H.; Wang, X.; Wen, B.; Xing, Q. Electromagnetic shielding performance of acrylonitrile-butadiene-styrene/CNTs composite foams with different cell structures. J. Supercrit. Fluids 2022, 186, 105608. [Google Scholar] [CrossRef]
  134. Gedler, G.; Antunes, M.; Velasco, J.I.; Ozisik, R. Enhanced electromagnetic interference shielding effectiveness of polycarbonate/graphene nanocomposites foamed via 1-step supercritical carbon dioxide process. Mater. Des. 2016, 90, 906–914. [Google Scholar] [CrossRef] [Green Version]
  135. Xu, Z.; Wang, X.; Pan, Z.; Huang, H. Sodium bicarbonate/azodiisobutyronitrile synergistic effect on low-density unsaturated polyester resin fabrication. Iran. Polym. J. 2018, 27, 207–216. [Google Scholar] [CrossRef]
  136. Li, R.; Lin, H.; Lan, P.; Gao, J.; Huang, Y.; Wen, Y.; Yang, W. Lightweight Cellulose/Carbon Fiber Composite Foam for Electromagnetic Interference (EMI) Shielding. Polymers 2018, 10, 1319. [Google Scholar] [CrossRef] [Green Version]
  137. Liang, C.; Qiu, H.; Han, Y.; Gu, H.; Song, P.; Wang, L.; Kong, J.; Cao, D.; Gu, J. Superior electromagnetic interference shielding 3D graphene nanoplatelets/reduced graphene oxide foam/epoxy nanocomposites with high thermal conductivity. J. Mater. Chem. C 2019, 7, 2725–2733. [Google Scholar] [CrossRef]
  138. Zhao, N.; Li, M.; Gong, H.; Bai, H. Controlling ice formation on gradient wettability surface for high-performance bioinspired materials. Sci. Adv. 2020, 6, eabb4712. [Google Scholar] [CrossRef]
  139. Li, D.; Bu, X.; Xu, Z.; Luo, Y.; Bai, H. Bioinspired Multifunctional Cellular Plastics with a Negative Poisson’s Ratio for High Energy Dissipation. Adv. Mater. 2020, 32, e2001222. [Google Scholar] [CrossRef]
  140. Göldel, A.; Kasaliwal, G.; Pötschke, P. Selective Localization and Migration of Multiwalled Carbon Nanotubes in Blends of Polycarbonate and Poly(styrene-acrylonitrile). Macromol. Rapid Commun. 2009, 30, 423–429. [Google Scholar] [CrossRef]
  141. Grady, B.P. Recent Developments Concerning the Dispersion of Carbon Nanotubes in Polymers. Macromol. Rapid Commun. 2009, 31, 247–257. [Google Scholar] [CrossRef] [PubMed]
  142. Liu, Y.; He, H.; He, G.; Zhao, J.; Yang, Y.; Tian, G. Segregated polylactide/poly(butylene adipate-co-terephthalate)/MWCNTs nanocomposites with excellent electrical conductivity and electromagnetic interference shielding. J. Appl. Polym. Sci. 2021, 139, 51668. [Google Scholar] [CrossRef]
  143. Jia, L.-C.; Yan, D.-X.; Cui, C.-H.; Ji, X.; Li, Z.-M. A Unique Double Percolated Polymer Composite for Highly Efficient Electromagnetic Interference Shielding. Macromol. Mater. Eng. 2016, 301, 1232–1241. [Google Scholar] [CrossRef]
  144. Zhang, K.; Li, G.-H.; Feng, L.-M.; Wang, N.; Guo, J.; Sun, K.; Yu, K.-X.; Zeng, J.-B.; Li, T.; Guo, Z.; et al. Ultralow percolation threshold and enhanced electromagnetic interference shielding in poly(L-lactide)/multi-walled carbon nanotube nanocomposites with electrically conductive segregated networks. J. Mater. Chem. C 2017, 5, 9359–9369. [Google Scholar] [CrossRef]
  145. Zhou, J.; Liu, C.; Xia, L.; Wang, L.; Qi, C.; Zhang, G.; Tan, Z.; Ren, B.; Yuan, B. Bridge-graphene connecting polymer composite with a distinctive segregated structure for simultaneously improving electromagnetic interference shielding and flame-retardant properties. Colloids Surf. A Physicochem. Eng. Asp. 2022, 661, 130853. [Google Scholar] [CrossRef]
  146. Mei, X.; Zhao, Y.; Jiang, H.; Gao, T.; Huang, Z.X.; Qu, J.P. Multifunctional starch/carbon nanotube composites with segregated structure: Electrical conductivity, electromagnetic interference shielding effectiveness, thermal conductivity, and electro-thermal conversion. J. Appl. Polym. Sci. 2023, 2023, e53904. [Google Scholar] [CrossRef]
  147. Navid, K.; Amir Hosein Ahmadian, H.; Parisa, N.; Jian, L.; Abbas, S.M.; Mohammad, A. Highly conductive polystyrene/carbon Nanotube/PEDOT:PSS nanocomposite with segregated structure for electromagnetic interference shielding. Carbon 2023, 212, 118104. [Google Scholar]
  148. Tian, G.; He, H.; Xu, M.; Liu, Y.; Gao, Q.; Zhu, Z. Ultralow percolation threshold biodegradable PLA/PBS/MWCNTs with segregated conductive networks for high-performance electromagnetic interference shielding applications. J. Appl. Polym. Sci. 2022, 140, e53558. [Google Scholar] [CrossRef]
  149. Xiong, Y.; Pei, H.; Lv, Q.; Chen, Y. A Facile Fabrication of PA12/CNTs Nanocomposites with Enhanced Three-Dimensional Segregated Conductive Networks and Electromagnetic Interference Shielding Property through Selective Laser Sintering. ACS Omega 2022, 7, 4293–4304. [Google Scholar] [CrossRef]
  150. Zhang, Q.; Cui, J.; Zhao, S.; Gao, A.; Zhang, G.; Yan, Y. Regulation binary electromagnetic filler networks in segregated poly(vinylidenefluoride) composite for absorption-dominated electromagnetic interference shielding. J. Appl. Polym. Sci. 2023, 140, e53650. [Google Scholar] [CrossRef]
  151. Wu, B.; Zhu, K.; Wen, X.; Li, M.; Yang, Y.; Yang, J. Fe3O4@PA6/MWCNT composites with multiple gradient segregated structures for electromagnetic shielding with low reflection. J. Appl. Polym. Sci. 2022, 139, 52085. [Google Scholar] [CrossRef]
  152. Yang, J.; Chen, Y.; Liu, C.; Wang, H.; Yan, X.; Chai, X.; Chen, Z.; Xia, Y.; Gao, H.; Zhang, H.; et al. Constructing 3D expanded graphite-silver segregated network structure for ultra-efficient EMI shielding and low reflection. J. Mater. Res. Technol. 2023, 23, 5115–5126. [Google Scholar] [CrossRef]
  153. Wang, X.; Smith, P.; Qiang, Z.; Guan, Q.; You, Z.; Ye, C.; Zhu, M. Fire-retardant, self-extinguishing multiblock poly(esterimide)s/graphene composites with segregated structure for electromagnetic interference shielding. Compos. Part A Appl. Sci. Manuf. 2022, 163, 107262. [Google Scholar] [CrossRef]
  154. Ma, R.-Y.; Yi, S.-Q.; Li, J.; Zhang, J.-L.; Sun, W.-J.; Jia, L.-C.; Yan, D.-X.; Li, Z.-M. Highly efficient electromagnetic interference shielding and superior mechanical performance of carbon nanotube/polydimethylsiloxane composite with interface-reinforced segregated structure. Compos. Sci. Technol. 2022, 232, 109874. [Google Scholar] [CrossRef]
  155. Pang, H.; Xu, L.; Yan, D.X.; Li, Z.M. Conductive polymer composites with segregated structures. Prog. Polym. Sci. 2014, 39, 1908–1933. [Google Scholar] [CrossRef]
  156. Yu, W.-C.; Xu, J.-Z.; Wang, Z.-G.; Huang, Y.-F.; Yin, H.-M.; Xu, L.; Chen, Y.-W.; Yan, D.-X.; Li, Z.-M. Constructing highly oriented segregated structure towards high-strength carbon nanotube/ultrahigh-molecular-weight polyethylene composites for electromagnetic interference shielding. Compos. Part A Appl. Sci. Manuf. 2018, 110, 237–245. [Google Scholar] [CrossRef]
  157. Zhang, L.; Yang, S.; Peng, L.; Zhong, K.; Chen, Y. Optimized Properties in Multifunctional Polyphenylene Sulfide Composites via Graphene Nanosheets/Boron Nitride Nanosheets Dual Segregated Structure under High Pressure. Nanomaterials 2022, 12, 3543. [Google Scholar] [CrossRef]
  158. Xie, Z.; Cai, Y.; Zhan, Y.; Meng, Y.; Li, Y.; Xie, Q.; Xia, H. Thermal insulating rubber foams embedded with segregated carbon nanotube networks for electromagnetic shielding applications. Chem. Eng. J. 2022, 435, 135118. [Google Scholar] [CrossRef]
  159. Yang, D.; Tao, J.-R.; Yang, Y.; He, Q.-M.; Weng, Y.-X.; Fei, B.; Wang, M. Effect interfacial size and multiple interface on electromagnetic shielding of silicon rubber/carbon nanotube composites with mixing segregated particles. Compos. Struct. 2022, 292, 115668. [Google Scholar] [CrossRef]
  160. Wang, Y.; Cheng, X.-D.; Song, W.-L.; Ma, C.-J.; Bian, X.-M.; Chen, M. Hydro-sensitive sandwich structures for self-tunable smart electromagnetic shielding. Chem. Eng. J. 2018, 344, 342–352. [Google Scholar] [CrossRef]
  161. Zhang, P.; Tian, R.; Zhang, X.; Ding, X.; Wang, Y.; Xiao, C.; Zheng, K.; Liu, X.; Chen, L.; Tian, X. Electromagnetic interference shielding epoxy composites with satisfactory thermal conductivity and electrical insulation performance enabled by low-melting-point alloy layered structure. Compos. Part B Eng. 2022, 232, 109611. [Google Scholar] [CrossRef]
  162. Sheng, A.; Ren, W.; Yang, Y.; Yan, D.-X.; Duan, H.; Zhao, G.; Liu, Y.; Li, Z.-M. Multilayer WPU conductive composites with controllable electro-magnetic gradient for absorption-dominated electromagnetic interference shielding. Compos. Part A Appl. Sci. Manuf. 2019, 129, 105692. [Google Scholar] [CrossRef]
  163. Li, Y.; Shen, B.; Yi, D.; Zhang, L.; Zhai, W.; Wei, X.; Zheng, W. The influence of gradient and sandwich configurations on the electromagnetic interference shielding performance of multilayered thermoplastic polyurethane/graphene composite foams. Compos. Sci. Technol. 2017, 138, 209–216. [Google Scholar] [CrossRef]
  164. Park, K.; Lee, S.; Kim, C.; Han, J. Fabrication and electromagnetic characteristics of electromagnetic wave absorbing sandwich structures. Compos. Sci. Technol. 2006, 66, 576–584. [Google Scholar] [CrossRef]
  165. Li, H.; Ru, X.; Song, Y.; Wang, H.; Yang, C.; Zheng, S.; Gong, L.; Zhang, X.; Duan, H.; Liu, Z.; et al. Flexible Sandwich-Structured Silicone Rubber/MXene/Fe3O4 Composites for Tunable Electromagnetic Interference Shielding. Ind. Eng. Chem. Res. 2022, 61, 11766–11776. [Google Scholar] [CrossRef]
  166. Wang, H.; Bi, H.; Liang, D.; Gui, X.; Ding, X.; Zhang, X.; Gao, J.; Zi, Z. Absorption-dominated electromagnetic shielding and excellent thermal conduction properties of poly(vinylidene fluoride)/SnBi58/Co-C composites with layered structure. J. Alloys Compd. 2022, 921, 165998. [Google Scholar] [CrossRef]
  167. Xu, L.; Wan, S.; Heng, Y.; Wang, S.; Yang, J.; Dong, Y.; Fu, Y.; Ni, Q. Double layered design for electromagnetic interference shielding with ultra-low reflection features: PDMS including carbon fibre on top and graphene on bottom. Compos. Sci. Technol. 2022, 231, 109797. [Google Scholar] [CrossRef]
  168. Zhou, Q.; Luo, D.; Hua, D.; Ye, W.; Li, S.; Zou, Q.; Chen, Z.; Wang, H. Design and characterization of metallic glass/graphene multilayer with excellent nanowear properties. Friction 2022, 10, 1913–1926. [Google Scholar] [CrossRef]
  169. Zhang, Y.; Gao, Q.; Sheng, X.; Zhang, S.; Chen, J.; Ma, Y.; Qin, J.; Zhao, Y.; Shi, X.; Zhang, G. Flexible, robust, sandwich structure polyimide composite film with alternative MXene and Ag NWs layers for electromagnetic interference shielding. J. Mater. Sci. Technol. 2023, 159, 194–203. [Google Scholar] [CrossRef]
  170. Wu, B.; Yu, Y.; Zhu, K.; Yang, Y.; Wen, X.; Liu, R.; Zhu, H.; Huang, J. Efficient Electromagnetic Interference Shielding of PPA6@NiM/PDMS Composites with Porous and Asymmetric Gradient Structures. ACS Appl. Polym. Mater. 2023, 5, 4789–4798. [Google Scholar] [CrossRef]
  171. Chu, Q.; Tao, W.; Lin, H.; Ma, M.; Chen, S.; Shi, Y.; He, H.; Wang, X. Well-designed structure of sandwich-like composite films based on hollow polyaniline and MXene with enhanced electromagnetic wave absorption. Ind. Crops Prod. 2023, 194, 116299. [Google Scholar] [CrossRef]
  172. Guo, D.; Huo, Y.; Mu, C.; Wang, B.; Xiang, J.; Nie, A.; Zhai, K.; Xue, T.; Wen, F.; Liu, Z. Flexible aramid nanofiber/Ag nanowires/graphene nanosheets composite films with sandwich structure for high-performance electromagnetic interference shielding and Joule heating. J. Alloys Compd. 2022, 923, 166401. [Google Scholar] [CrossRef]
  173. Song, P.; Liao, X.; Zou, F.; Wang, X.; Liu, F.; Liu, S.; Li, G. Frequency-adjustable electromagnetic interference shielding performance of sandwich-structured conductive polymer composites by selective foaming and tunable filler dispersion. Compos. Commun. 2022, 34, 101264. [Google Scholar] [CrossRef]
  174. Liu, F.; Wei, Z.; Hu, X.; Cai, Y.; Chen, Z.; Yang, C.; Zhan, Y.; Xia, H. Asymmetric segregated network design of ultralight and thermal insulating polymer composite foams for green electromagnetic interference shielding. Compos. Commun. 2022, 38, 101492. [Google Scholar] [CrossRef]
  175. Xing, Y.; Wan, Y.; Wu, Z.; Wang, J.; Jiao, S.; Liu, L. Multilayer Ultrathin MXene@AgNW@MoS2 Composite Film for High-Efficiency Electromagnetic Shielding. ACS Appl. Mater. Interfaces 2023, 15, 5787–5797. [Google Scholar] [CrossRef] [PubMed]
  176. Gu, T.; Zeng, Z.; Wu, S.; Sun, D.X.; Zhao, C.S.; Wang, Y. Poly(L-lactic acid)/graphene composite films with asymmetric sandwich structure for thermal management and electromagnetic interference shielding. Chem. Eng. J. 2023, 466, 143190. [Google Scholar] [CrossRef]
  177. Zhang, C.; Bi, L.; Shi, S.; Wang, H.; Zhang, D.; He, Y.; Li, W. Two-Steps Method to Prepare Multilayer Sandwich Structure Carbon Fiber Composite with Thermal and Electrical Anisotropy and Electromagnetic Interference Shielding. Materials 2023, 16, 680. [Google Scholar] [CrossRef]
  178. Xia, Q.; Zhang, Z.; Chu, H.; Liu, Y.; Leng, J. Research on high electromagnetic interference shielding effectiveness of a foldable buckypaper/polyacrylonitrile composite film via interface reinforcing. Compos. Part A Appl. Sci. Manuf. 2018, 113, 132–140. [Google Scholar] [CrossRef]
  179. Thomassin, J.-M.; Jérôme, C.; Pardoen, T.; Bailly, C.; Huynen, I.; Detrembleur, C. Polymer/carbon based composites as electromagnetic interference (EMI) shielding materials. Mater. Sci. Eng. R Rep. 2013, 74, 211–232. [Google Scholar] [CrossRef]
  180. Jayalakshmi, C.G.; Inamdar, A.; Anand, A.; Kandasubramanian, B. Polymer matrix composites as broadband radar absorbing structures for stealth aircrafts. J. Appl. Polym. Sci. 2018, 136, 47241. [Google Scholar] [CrossRef] [Green Version]
  181. Joshi, A.M.; Athawale, A.A. Electrically Conductive Silicone/Organic Polymer Composites. Silicon 2013, 6, 199–206. [Google Scholar] [CrossRef]
  182. Scott, P. Aerospace and military [Technology 2000 analysis and forecast]. IEEE Spectr. 2000, 37, 97–102. [Google Scholar] [CrossRef]
  183. Wang, C.; Chen, M.; Lei, H.; Yao, K.; Li, H.; Wen, W.; Fang, D. Radar stealth and mechanical properties of a broadband radar absorbing structure. Compos. Part B Eng. 2017, 123, 19–27. [Google Scholar] [CrossRef]
  184. Amudhu, L.B.T.; Samsingh, R.V.; Florence, S.E.; Abirami, B.S. Novel radar absorbing material using resistive frequency selective surface based polymer composites for enhanced broadband microwave absorption. Proc. Inst. Mech. Eng. Part L J. Mater. Des. Appl. 2023, 2023, 14644207231169362. [Google Scholar] [CrossRef]
  185. Teber, A.; Unver, I.; Kavas, H.; Aktas, B.; Bansal, R. Knitted radar absorbing materials (RAM) based on nickel–cobalt magnetic materials. J. Magn. Magn. Mater. 2016, 406, 228–232. [Google Scholar] [CrossRef]
  186. Chen, C.-Y.; Pu, N.-W.; Liu, Y.-M.; Huang, S.-Y.; Wu, C.-H.; Ger, M.-D.; Gong, Y.-J.; Chou, Y.-C. Remarkable microwave absorption performance of graphene at a very low loading ratio. Compos. Part B Eng. 2017, 114, 395–403. [Google Scholar] [CrossRef]
  187. Kasgoz, A.; Korkmaz, M.; Durmus, A. Compositional and structural design of thermoplastic polyurethane/carbon based single and multi-layer composite sheets for high-performance X-band microwave absorbing applications. Polymer 2019, 180, 121672. [Google Scholar] [CrossRef]
  188. Pratap, V.; Soni, A.K.; Baskey, H.B.; Abbas, S.M.; Siddiqui, A.M.; Prasad, N.E. Electromagnetic and radar absorbing properties of γ Fe2O3/Ba4Co2Fe36O60-epoxy polymeric composites for stealth applications. Solid State Sci. 2021, 113, 106553. [Google Scholar] [CrossRef]
  189. Gu, W.; Ong, S.J.H.; Shen, Y.; Guo, W.; Fang, Y.; Ji, G.; Xu, Z.J. A Lightweight, Elastic, and Thermally Insulating Stealth Foam with High Infrared-Radar Compatibility. Adv. Sci. 2022, 9, 2204165. [Google Scholar] [CrossRef]
  190. Lan, D.; Gao, Z.; Zhao, Z.; Kou, K.; Wu, H. Application progress of conductive conjugated polymers in electromagnetic wave absorbing composites. Compos. Commun. 2021, 26, 100767. [Google Scholar] [CrossRef]
  191. Engels, S.; Schneider, N.-L.; Lefeldt, N.; Hein, C.M.; Zapka, M.; Michalik, A.; Elbers, D.; Kittel, A.; Hore, P.J.; Mouritsen, H. Anthropogenic electromagnetic noise disrupts magnetic compass orientation in a migratory bird. Nature 2014, 509, 353–356. [Google Scholar] [CrossRef] [PubMed]
  192. Erogul, O.; Oztas, E.; Yildirim, I.; Kir, T.; Aydur, E.; Komesli, G.; Irkilata, H.C.; Irmak, M.K.; Peker, A.F. Effects of electromagnetic radiation from a cellular phone on human sperm motility: An in vitro study. Arch. Med. Res. 2006, 37, 840–843. [Google Scholar] [CrossRef] [PubMed]
  193. Song, W.-L.; Wang, J.; Fan, L.-Z.; Li, Y.; Wang, C.-Y.; Cao, M.-S. Interfacial Engineering of Carbon Nanofiber–Graphene–Carbon Nanofiber Heterojunctions in Flexible Lightweight Electromagnetic Shielding Networks. ACS Appl. Mater. Interfaces 2014, 6, 10516–10523. [Google Scholar] [CrossRef]
  194. Savi, P.; Giorcelli, M.; Quaranta, S. Multi-Walled Carbon Nanotubes Composites for Microwave Absorbing Applications. Appl. Sci. 2019, 9, 851. [Google Scholar] [CrossRef] [Green Version]
  195. Sharma, G.K.; James, N.R. Progress in Electrospun Polymer Composite Fibers for Microwave Absorption and Electromagnetic Interference Shielding. ACS Appl. Electron. Mater. 2021, 3, 4657–4680. [Google Scholar] [CrossRef]
  196. Guo, H.; Wang, F.; Luo, H.; Li, Y.; Lou, Z.; Ji, Y.; Liu, X.; Shen, B.; Peng, Y.; Liu, K.; et al. Flexible TaC/C electrospun non–woven fabrics with multiple spatial-scale conductive frameworks for efficient electromagnetic interference shielding. Compos. Part A Appl. Sci. Manuf. 2021, 151, 106662. [Google Scholar] [CrossRef]
  197. Long, T.; Hu, L.; Dai, H.; Tang, Y. Facile synthesis of Ag-reduced graphene oxide hybrids and their application in electromagnetic interference shielding. Appl. Phys. A 2014, 116, 25–32. [Google Scholar] [CrossRef]
  198. Xie, S.; Ji, Z.; Zhu, L.; Zhang, J.; Cao, Y.; Chen, J.; Liu, R.; Wang, J. Recent progress in electromagnetic wave absorption building materials. J. Build. Eng. 2019, 27, 100963. [Google Scholar] [CrossRef]
  199. Terukov, E.I.; Babaev, A.A.; Tkachev, A.G.; Zhilina, D.V. Radio-Wave Absorbing Properties of Polymer Composites on the Basis of Shungite and Carbon Nanomaterial Taunit-M. Tech. Phys. 2018, 63, 1044–1048. [Google Scholar] [CrossRef]
  200. Zhang, J.; Zhang, J.; Shuai, X.; Zhao, R.; Guo, T.; Li, K.; Wang, D.; Ma, C.; Li, J.; Du, J. Design and Synthesis Strategies: 2D Materials for Electromagnetic Shielding/Absorbing. Chem. Asian J. 2021, 16, 3817–3832. [Google Scholar] [CrossRef]
  201. Lan, C.; Li, C.; Hu, J.; Yang, S.; Qiu, Y.; Ma, Y. High-Loading Carbon Nanotube/Polymer Nanocomposite Fabric Coatings Obtained by Capillarity-Assisted “Excess Assembly” for Electromagnetic Interference Shielding. Adv. Mater. Interfaces 2018, 5, 201800116. [Google Scholar] [CrossRef]
  202. Tao, W.; Ma, M.; Liao, X.; Shao, W.; Chen, S.; Shi, Y.; He, H.; Wang, X. Cellulose nanofiber/MXene/mesoporous carbon hollow spheres composite films with porous structure for deceased reflected electromagnetic interference shielding. Compos. Commun. 2023, 2023, 101647. [Google Scholar] [CrossRef]
Molecules 28 05628 g001 550
Figure 1. Electromagnetic shielding mechanism diagram.
Figure 1. Electromagnetic shielding mechanism diagram.
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Molecules 28 05628 g002 550
Figure 2. (a) The creation method of PLA/CNT compounds utilizing a “two-step dispersion strategy”; (b) the EMI SE, (c,d) in the X-band region; composites SEA, SER, and SET [95].
Figure 2. (a) The creation method of PLA/CNT compounds utilizing a “two-step dispersion strategy”; (b) the EMI SE, (c,d) in the X-band region; composites SEA, SER, and SET [95].
Molecules 28 05628 g002
Molecules 28 05628 g003 550
Figure 3. (a) a−g SWCNT, PANI, and PANI-SWCNT composites’ FTIR spectra; (b) PANI + SWCNT composites’ total shielding efficiency (SET) at ambient temperature [96].
Figure 3. (a) a−g SWCNT, PANI, and PANI-SWCNT composites’ FTIR spectra; (b) PANI + SWCNT composites’ total shielding efficiency (SET) at ambient temperature [96].
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Molecules 28 05628 g004 550
Figure 4. (a) MX/PU composite foams’ electrical conductivities; (b) EMI SEs of MX/PU mixed foams with varying Ti3C2Tx compositions; (c) MX/PU mixed foams with EMI SEs operating in the X-band; (d) MX/NAPU and MX/APU’s average EMI SET, SER, and SEA in the X-band [128].
Figure 4. (a) MX/PU composite foams’ electrical conductivities; (b) EMI SEs of MX/PU mixed foams with varying Ti3C2Tx compositions; (c) MX/PU mixed foams with EMI SEs operating in the X-band; (d) MX/NAPU and MX/APU’s average EMI SET, SER, and SEA in the X-band [128].
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Molecules 28 05628 g005 550
Figure 5. EMI SE of (a) PDCPDCNT/GN-1, (b) PDCPD-CNT/GN-2 composites [130].
Figure 5. EMI SE of (a) PDCPDCNT/GN-1, (b) PDCPD-CNT/GN-2 composites [130].
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Molecules 28 05628 g006 550
Figure 6. (a,b) Average electromagnetic interference shielding efficiency; (c,d) TPU/MWCNT sandwich-structured composites’ and foams’ coefficient of power [173].
Figure 6. (a,b) Average electromagnetic interference shielding efficiency; (c,d) TPU/MWCNT sandwich-structured composites’ and foams’ coefficient of power [173].
Molecules 28 05628 g006
Table
Table 1. Summary of the research on poly-based electromagnetic shielding composites with uniform structure.
Table 1. Summary of the research on poly-based electromagnetic shielding composites with uniform structure.
Materials *Filler LoadingEMI SE (dB)Thickness (mm)FrequencyRef.
PVA/GN/Fe3O40.1 wt%40.70.28–12 Ghz[79]
EP/PES/MWCNT2.9 wt%232.28–12 Ghz[80]
GN/CFN 20 wt%7328–12 Ghz[72]
VGCNF/PVDF5 wt%16.40.8230 Khz–1.5 Ghz[81]
PEDOT/GNP15 wt%18-8–12 Ghz[82]
RGO/PdNi/EVA1 wt% 30-8–12 Ghz[83]
POM/MWCNT40 wt%45.70.158–12 Ghz[75]
PE/PVDF/Fe3O4/CNT10 wt%262.618–26 Ghz[84]
PLLA/MWCNT10 vol%232.58–12 Ghz[85]
PVDF/RGO21 wt%601.58–12 Ghz[74]
PLA/PEO/GNP6 wt%10.5-8–12 Ghz[86]
PMMA/GNP-MWCNT8 wt%3628–12 Ghz[87]
PDMS/GA12.5 wt%5234–16 Ghz[88]
PVDF/Ba4CO2Fe36O6020 wt%830.128–18 Ghz[89]
CF/PAA/Fe3O410 wt%40.63.52–18 Ghz[90]
PVDF/PANI30 wt%6518–12 Ghz[73]
ABS/CB/CNT3 wt%2928–12 Ghz[91]
PP/MWCNT20 wt%4728–12 Ghz[92]
BF/PANI7 wt%35.73-8–12 Ghz[93]
PS/PANI40 wt%450.258–12 Ghz[71]
CB/EMA/TPO30 wt%29114–20 Ghz[94]
PLA/CNT5.6 wt%31.1-8–12 Ghz[95]
SWCNT/PANI3 wt%32.80.58–12 Ghz[96]
TPU/SiAPP/SCF/Ti3C2Tx MXene20 wt%50.518–12 Ghz[97]
* GN—graphene; PVA—polyvinyl alcohol; CFN—carbon fiber network; VGCNF—vapor-grown carbon nanofiber; PE—polyethylene; PLLA—poly (l-lactic acid); PLA—polylactic acid; PEO—poly(ethylene oxide); GA—graphene aerogel; CF—carbon fiber; PAA—polyacrylic acid; PP—polypropylene; BF—Bagasse Fiber.
Table
Table 2. Summary of the research on poly-based electromagnetic shielding composites with foam structure.
Table 2. Summary of the research on poly-based electromagnetic shielding composites with foam structure.
Materials *Filler LoadingEMI SE (dB)Thickness (mm)FrequencyRef.
TEG/PU3 wt%20.4-8–12 Ghz[117]
EVA/PPy/AgNPs52 wt%107.452.48–12 Ghz[118]
PEN/GN/CNT/Fe4O33.5 wt%380.68–12 Ghz[37]
TPU/Ti3C2Tx MXene0.66 vol%72.228–12 Ghz[119]
CO3O4/CNT/MF-25.638–12 Ghz[120]
PET/BAHT/SWCNT2 wt%45.7-8–12 Ghz[121]
RGO/PU5 wt%23-8–12 Ghz[122]
CMF/SiO2/CNT30 wt%61.3428–12 Ghz[38]
TPU/MWCNT2.5 wt%44.86-10–14 Ghz[123]
PVDF/CNT8 wt%4118–12 Ghz[124]
PS/PMMA/MWCNT2 vol%25.328–12 Ghz[125]
ABS/CB:CNT15 wt%81.358–12 Ghz[126]
PBS/CNT4 wt%24-8–12 Ghz[127]
PA6/CF22 wt%36.6118–26 Ghz[36]
MXene/APU22 wt%76.258–12 Ghz[128]
MWCNT/WPU/PVA/MCHM40 wt%232.58–12 Ghz[129]
PDCPD-CNT/GN3.5 wt%4338–12 Ghz[130]
PEI/Ti3C2Tx MXene/AG1 wt%28-8–12 Ghz[131]
PVDF/GNPs/CNT/Ni16 wt%19.418–12 Ghz[132]
ABS/CNT7 wt%26.628–12 Ghz[133]
* TEG—thermally exfoliated graphene; PU—polyurethane; AgNPs—Ag nanoparticles; PEN—Poly(arylene ether nitrile); MF—melamine-formaldehyde; PET—poly(ethylene terephthalate); BAHT—bis(6-aminohexyl) terephthalamide; CMF—carbonated melamine foam; PBS—poly (butylene succinate); PDCPD—polydicyclopentadiene.
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Wang, Y.; Zhao, W.; Tan, L.; Li, Y.; Qin, L.; Li, S. Review of Polymer-Based Composites for Electromagnetic Shielding Application. Molecules 2023, 28, 5628. https://doi.org/10.3390/molecules28155628

AMA Style

Wang Y, Zhao W, Tan L, Li Y, Qin L, Li S. Review of Polymer-Based Composites for Electromagnetic Shielding Application. Molecules. 2023; 28(15):5628. https://doi.org/10.3390/molecules28155628

Chicago/Turabian Style

Wang, Yuqi, Wei Zhao, Linli Tan, Yingru Li, Liu Qin, and Shidong Li. 2023. "Review of Polymer-Based Composites for Electromagnetic Shielding Application" Molecules 28, no. 15: 5628. https://doi.org/10.3390/molecules28155628

APA Style

Wang, Y., Zhao, W., Tan, L., Li, Y., Qin, L., & Li, S. (2023). Review of Polymer-Based Composites for Electromagnetic Shielding Application. Molecules, 28(15), 5628. https://doi.org/10.3390/molecules28155628

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