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Metals
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Graphene-Metal Composite
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Graphene-Metal Composite

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (15 September 2019) | Viewed by 13692

Special Issue Editor

Dr. Rees B. Rankin

E-Mail Website
Guest Editor
Department of Chemical Engineering, Villanova University, Villanova, PA, USA
Interests: Transition Metal and Alloy Catalysts; Oxide Supports and Sorbents; Copper-based Adsorbents for Bioseparations; Nanoporous Materials for gas separations; Metal-Organic Interfaces for novel nano-electronic devices; Computational Modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The use of graphene as a direct support for small metal particles or hybrid-architecture materials has gained significant interest in the last 10 years. The two-dimensional structure of graphene (or related atomically thin materials) provides unique electronic structure properties, which can be tuned or leveraged via interaction with adsorbed metal atoms or metal atom clusters. Application areas where this has seen rapid acceleration of research interest include: tailored catalysts, novel electronics, novel spintronics, biosensors, and more. The main themes invited for discussion in this Special Issue include, but are not limited to, the following:

  1. Discoveries or challenges in the synthesis of metal-decorated-graphene composites
  2. Ability to modify adsorption and properties of metal-decorated-graphene via dopants
  3. Novel metal-decorated-graphene composite catalysts
  4. Novel metal-decorated-graphene electronic or spintronic device applications
  5. Theoretical screening of related materials (metal-decorated borophene)

Contributions from all disciplines and areas of expertise across industry, national research laboratories, and academia are encouraged and welcomed.

Dr. Rees B. Rankin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Metal-decorated graphene
  • Metal nanoparticles
  • Graphene
  • Functionalized graphene
  • Hybrid material architectures
  • Composite nanomaterials
  • Spintronics
  • Catalysts
  • Gas sensors
  • 2D materials

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Published Papers (4 papers)

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Research

16 pages, 3791 KiB  
Article
Green Activated Magnetic Graphitic Carbon Oxide and Its Application for Hazardous Water Pollutants Removal
by Lakshmi Prasanna Lingamdinne, Jong-Soo Choi, Yu-Lim Choi, Jae-Kyu Yang, Janardhan Reddy Koduru and Yoon-Young Chang
Metals 2019, 9(9), 935; https://doi.org/10.3390/met9090935 - 27 Aug 2019
Cited by 5 | Viewed by 2303
Abstract
Graphitic carbon oxide (GCO) and magnetic graphitic carbon oxide (MGCO) were prepared from sugar via optimized green activation by employing ozone oxidation, and applied to wastewater treatment. The maximal oxidation and adsorption yield of pollutants were achieved at pH 2.0−4.0, which is the [...] Read more.
Graphitic carbon oxide (GCO) and magnetic graphitic carbon oxide (MGCO) were prepared from sugar via optimized green activation by employing ozone oxidation, and applied to wastewater treatment. The maximal oxidation and adsorption yield of pollutants were achieved at pH 2.0−4.0, which is the optimized pH for ozone oxidation of GC to generate GCO. As-prepared GCO and MGCO were characterized using X-ray, infrared, and microscopic techniques. The MGCO has enough saturation magnetization (MS) of 41.38 emu g−1 for separation of the sorbent from the reaction medium by applying an external magnetic field. Batch adsorption of radioactive and heavy metals (Th(IV), Pb(II)), and a dye (methylene blue (MB)) using GCO and MGCO was evaluated by varying the adsorbent dose, equilibrium pH, contact time, initial metal and dye concentrations, and kinetics and isotherms. Adsorption kinetics and isotherm studies indicated that Th(IV), Pb(II), and MB adsorption were best described by pseudo-second-order kinetics and Langmuir isotherm with R2 (correlation coefficient) > 0.99, respectively. The maximum adsorption capacities for Th(IV), Pb(II), and MB were 52.63, 47.39, and 111.12 mg g−1 on GCO and 76.02, 71.94, and 76.92 mg g−1 on MGCO. GCO and MGCO are prospectively effective and low-cost adsorbents for ion removal in wastewater treatment. As prepared MGCO can be reused up to three cycles for Th(IV), Pb(II), and MB. This work provides fundamental information about the equilibrium adsorption isotherms and mechanisms for Th(IV), Pb(II), and MB on GCO and MGCO. Full article
(This article belongs to the Special Issue Graphene-Metal Composite)
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12 pages, 6355 KiB  
Article
The Effect of Ion Irradiation Induced Defects on Mechanical Properties of Graphene/Copper Layered Nanocomposites
by Wenjuan Yao and Lei Fan
Metals 2019, 9(7), 733; https://doi.org/10.3390/met9070733 - 29 Jun 2019
Cited by 16 | Viewed by 3359
Abstract
One of the miraculous functions of graphene is to use its defects to alter the material properties of graphene composites and, thereby, expand the application of graphene in other fields. In this paper, various defects have been created in graphene by using ion [...] Read more.
One of the miraculous functions of graphene is to use its defects to alter the material properties of graphene composites and, thereby, expand the application of graphene in other fields. In this paper, various defects have been created in graphene by using ion irradiation. Defective graphene is sandwiched between two copper layers. A numerical model of Graphene/Copper layered composites after irradiation damage was established by the molecular dynamics method. The effects of ion irradiation and temperature coupling on defective graphene/copper composites were studied. The results show that there are a lot of empty defects in graphene after irradiation injury, which will produce more incomplete bonding. Although the bonds between carbon atoms can be weakened, defective graphene still enhances the mechanical properties of pure copper. At the same time, the location and arrangement of defects have a great influence on the mechanical stability of graphene/copper composites, and the arrangement of empty defects has different effects on deformation behavior and the stress transfer mechanism. It can be concluded that the defects formed by radiation have an effect on the physical properties of two-dimensional materials. Therefore, irradiation technology can be used to artificially control the formation of defects, and then make appropriate adjustments to their properties. This can not only optimize the radiation resistance and mechanical properties of nuclear materials, but also expand the application of graphene in electronic devices and other fields. Full article
(This article belongs to the Special Issue Graphene-Metal Composite)
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15 pages, 25242 KiB  
Article
Adsorption Energy Shifts for Oxygen and Hydroxyl on 4-atom Metal-Decorated Graphene Catalysts Via Solvation, pH, and Substrate Dopants: Effects on ORR Activity
by Rees B. Rankin and Tamara Lozano
Metals 2019, 9(2), 227; https://doi.org/10.3390/met9020227 - 14 Feb 2019
Cited by 3 | Viewed by 4352
Abstract
Recent literature results have highlighted the role of small transition metal and intermetallic nanoparticles supported on graphene as catalysts for many key applications in energy and commodity chemicals industries. Specifically, metal nanoparticle catalysts down to sizes of 4 and even 1 (single atom [...] Read more.
Recent literature results have highlighted the role of small transition metal and intermetallic nanoparticles supported on graphene as catalysts for many key applications in energy and commodity chemicals industries. Specifically, metal nanoparticle catalysts down to sizes of 4 and even 1 (single atom catalysts) on graphene have been studied for the Oxygen Reduction Reaction (ORR). A recent study showed that 4-atom transition metal intermetallic nanoparticles (NP) on graphene (metal-decorated graphene (MDG)) even generate a predictive Volcano Plot for ORR activity. Initial results from that study were not completely explained, and an expanded analysis and discussion built from that work is presented in this manuscript. Specifically, in this new work, the original Volcano Plot for 4-atom MDG NP catalysts for the ORR is analyzed for its counter-intuitive thermodynamic inversion between the rate limiting steps of O* hydrogenation and OH* hydrogenation. The Volcano Plot is then further studied for dependence on solvent correction energy, system pH, and with an initial probe on the sensitivity of descriptor values on doping of the graphene support via B and N atoms. Recommendations for optimum 4-atom MDG NP catalyst operation for the ORR are provided, and directions for future work and study are provided. Full article
(This article belongs to the Special Issue Graphene-Metal Composite)
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10 pages, 3598 KiB  
Article
The Wear Properties of TiC/Al-Based Composite Coating Applied by Laser Cladding
by Sansan Ao, Tai Wang, Yizhe Huang, Yu Dai, Yangchuan Cai and Zhen Luo
Metals 2018, 8(11), 975; https://doi.org/10.3390/met8110975 - 21 Nov 2018
Cited by 6 | Viewed by 2856
Abstract
Aluminum powders with different concentrations of TiC ceramic particles were applied to an AZ31B magnesium alloy by laser cladding. Due to differences in coefficients of thermal expansion, the distribution of TiC ceramic particles in the cladding layer was not uniform. The results show [...] Read more.
Aluminum powders with different concentrations of TiC ceramic particles were applied to an AZ31B magnesium alloy by laser cladding. Due to differences in coefficients of thermal expansion, the distribution of TiC ceramic particles in the cladding layer was not uniform. The results show that the degree of TiC ceramic particle agglomeration in the cladding layer increases with increasing TiC content. The phases of cladding metal mainly consisted of Al, γ-Al12Mg17, β-Al3Mg2, and TiC. The γ-Al12Mg17 phase mainly distributed to the bottom of the cladding layer, and the β-Al3Mg2 phase distributed to the middle and surface areas. The existence of the γ-Al12Mg17 phase enhanced the hardness of the fusion zone. The microhardness of the cladding layer increased with increasing TiC ceramic particle content. An appropriate TiC content improved the wear resistance of the cladding layer. When the TiC content was excessive, the agglomeration behavior of TiC ceramic particles strongly affected the wear resistance of the coatings. Full article
(This article belongs to the Special Issue Graphene-Metal Composite)
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