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Crystals
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Nanomaterials: Nanostructures and Magnetic Semiconductors
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Nanomaterials: Nanostructures and Magnetic Semiconductors

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 8883

Special Issue Editors

Prof. Dr. Masayuki Nogami

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Guest Editor
Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan
Interests: optical and photonic materials; glass; SiO2; Al2O3; ceramics; alloys; oxides; fuel cells; quantum dots; semiconductors; electrical and magnetical nanomaterials; materials science and engineering;
Prof. Dr. Yong Yang

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Guest Editor
Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 201899, China
Interests: surface modification of ceramics and SiC; novel optical film and coating; metal and semiconductor nanostructures: SPR, SERS and TERS; materials science and engineering
Dr. Nguyen Viet Long

E-Mail Website
Guest Editor
Institute of Applied Technology, Thu Dau Mot University, Thu Dau Mot City, Vietnam
Interests: nanoparticles; nanostructures; nanomaterials and applications for the future; materials science and engineering
Dr. Nguyen Thi Nhat Hang

E-Mail Website
Guest Editor
Institute of Applied Technology, Thu Dau Mot University, Thu Dau Mot City, Vietnam
Interests: platinum nanoparticles; gold nanoparticles; nanoparticles; nanostructures; nanomaterials and applications for the future; materials science and engineering

Special Issue Information

Dear Colleagues,

At present, nanomaterials and nanoscience are becoming much more important in our society. This Special Issue will provide the latest fabrication processes and technologies of metal, bimetal, multimetal, glass, oxide, alloy, ceramic, and semiconductor nanoparticles and nanostructures, specifically interesting discoveries of new or modified crystal structures of inorganic nanoparticles, physical and chemical behaviors of micro/nanoscale materials, and chemical and physical properties focusing on high crystallization. The critical issues of controlling the growth, the development, and the formation of nanoparticles have become increasingly important. These issues directly involve characteristics such as the size, shape, morphology, composition, and the doping content at the molecular and atomic level, in addition to the surfaces and functions of metal, bimetal, multimetal, oxide, alloy, ceramic, and semiconductor nanoparticles and the measurement and characterization of as-prepared nanoparticles. In the 21st century, both theoretical and experimental perspectives of functional micro/nanoparticles need to be intensively researched and developed. Such research and development leads to new or modified physical and chemical properties, providing both scientific research and emerging technological applications that lead to new applications of nanoparticles, such as for capacitors, batteries, fuel cells, and photovoltaic cells in clean energy conversion and storage. The latest developments in this field have involved advanced micro/nanosized materials and components design in relation to the most typically important chemical and physical properties, such as catalytic, biological, electrical, magnetic, optical, photonic, and sensing properties and other special properties for life, health, medicine, renewable energy, the environment, and other related areas. This Special Issue is focused on applications of metal, bimetal, multimetal, oxide, alloy, ceramic, and semiconductor nanoparticles and quantum dots for life, health, energy, and the environment. We invite researchers to contribute to this Special Issue with original works in the form of communications, original research, or review articles. This Special Issue will cover very interesting topics, such as:

  • The discoveries and determination of the new, modified, and original crystal structures and compounds (fcc, bcc, hcp, AB2O4, ABO3, and others): The original structural modification and doping processes;• The controlled synthesis, structural variation, and properties of metal, bimetal, multimetal, oxide, alloy, glass, ceramic, and semiconductor nanoparticles as a result of various biological, chemical, physical, and experimental processes;
  • The controlled synthesis, structure, and properties of ferrite and perovskite nanoparticles with the new, modified, and original structures;
  • The controlled synthesis, structure, and properties of magnetic nanoparticles;
  • The controlled synthesis, structure, and properties of targeted functional nanoparticles: the special case of magnetic semiconductor nanoparticles;
  • The controlled synthesis of nanocrystals, nanoparticles, and core-shell nanoparticles in the various forms of metal, bimetal, multimetal, oxide, and alloys: the special cases of high-entropy, multicomponent hybrid oxides and alloy nanoparticles;
  • The physics and chemistry of semiconductor nanoparticles with their special applications for research and academia, life, industry, energy, and the environment in sustainable development goals;
  • The latest developments and new applications of metal, bimetal, multimetal, oxide, alloy, glass, ceramic, and semiconductor nanoparticles, as well as their quantum dots.

Any other topics of interest on the fields and not included herein are welcome.

Prof. Dr. Masayuki Nogami
Prof. Dr. Yong Yang
Dr. Nguyen Viet Long
Dr. Nguyen Thi Nhat Hang
Guest Editors

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. Crystals 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 2100 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

  • crystals
  • ceramics
  • alloys
  • oxides
  • semiconductors
  • quantum dots
  • nanoparticles
  • nanomaterials
  • life
  • health
  • energy
  • environment

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue polices can be found here.

Published Papers (4 papers)

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Research

15 pages, 1021 KiB  
Article
Impact of Temperature on Seebeck Coefficient of Nodal Line Semimetal in Molecular Conductor
by Yoshikazu Suzumura
Crystals 2024, 14(7), 601; https://doi.org/10.3390/cryst14070601 - 28 Jun 2024
Viewed by 713
Abstract
We examine the impact of temperature (T) on the Seebeck coefficient S, i.e., the T dependence of S for a single-component molecular conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) with a half-filled band, where the coefficient is obtained from a [...] Read more.
We examine the impact of temperature (T) on the Seebeck coefficient S, i.e., the T dependence of S for a single-component molecular conductor [Pd(dddt)2] (dddt = 5,6-dihydro-1,4-dithiin-2,3-dithiolate) with a half-filled band, where the coefficient is obtained from a ratio of the thermal conductivity to the electrical conductivity. The present paper demonstrates theoretically the novel result of large anisotropy in the Seebeck coefficient components of three-dimensional Dirac electrons in a molecular conductor. The conductor exhibits a nodal line with the energy variation around the chemical potential and provides the density of states (DOS) with a minimum. Using a threedimensional tight-binding (TB) model in the presence of both impurity and electron–phonon (e–p) scatterings, we study the Seebeck coefficient Sy for the molecular stacking and the most conducting direction. The impact of T on Sy exhibits a sign change, where Sy > 0 with a maximum at high temperatures and Sy < 0 with a minimum at low temperatures. The T dependence of Sy suggests that the contribution from the conduction (valence) band is dominant at low (high) temperatures. Further, it is shown that the the Seebeck coefficient components for perpendicular directions Sx and Sz are much smaller than Sy and present no sign change, in contrast to Sy. These results are analyzed in terms of the spectral conductivity as a function of the energy ϵ close to the chemical potential μ. Full article
(This article belongs to the Special Issue Nanomaterials: Nanostructures and Magnetic Semiconductors)
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17 pages, 3701 KiB  
Article
Amine-Terminated Modified Succinic Acid-Magnetite Nanoparticles for Effective Removal of Malachite Green Dye from Aqueous Environment
by Saad Melhi
Crystals 2023, 13(9), 1301; https://doi.org/10.3390/cryst13091301 - 24 Aug 2023
Cited by 1 | Viewed by 1507
Abstract
In this study, amine-terminated succinic acid-modified magnetic nanoparticles (MSA@TEPA) have been successfully synthesized using a facile two-step procedure as a new effective adsorbent for the removal of malachite green from aqueous solutions. The MSA@TEPA was characterized by scanning electron microscopy (SEM), Fourier-transform infrared [...] Read more.
In this study, amine-terminated succinic acid-modified magnetic nanoparticles (MSA@TEPA) have been successfully synthesized using a facile two-step procedure as a new effective adsorbent for the removal of malachite green from aqueous solutions. The MSA@TEPA was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), zeta potential, thermal gravimetric analysis (TGA), and X-ray diffraction (XRD) analysis. The parameters influencing the adsorption capacity of MSA@TEPA, such as pH (3–8), contact time (t: 5–480 min), initial concentrations of MG dye (Co: 20–200 mg/L), and adsorbent mass (0.05–0.5 g), were evaluated. It was observed that, under specified experimental conditions (Co: 25 mg/L, pH: 7.1, T: 298 K, agitation rate: 100 rpm, and t: 420 min), the MSA@TEPA nanocomposite exhibits excellent adsorption efficiency (97.74%) for MG dye. The adsorption kinetics follow the PSO model, and the equilibrium data were fitted to the Langmuir isotherm with a maximum adsorption capacity of up to 282.65 mg/g. The thermodynamic parameters indicated that the adsorption process of MG dye was an exothermic process. After five consecutive cycles, MSA@TEPA nanocomposite still show good adsorption efficiency for MG dye. It is assumed that, because of the presence of amine group, adsorption mainly occurred through electrostatic interaction and H-bonding. In conclusion, the study shows a new and effective adsorbent with high adsorptive capacity, easy magnetic separation using an external magnetic field, and reusability for MG dye elimination from aqueous solutions. Full article
(This article belongs to the Special Issue Nanomaterials: Nanostructures and Magnetic Semiconductors)
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11 pages, 1850 KiB  
Article
Structural, Optical and Dielectric Properties of Holmium-Doped Nickel-Cadmium Ferrite Nanoparticles Synthesized by Sol-Gel Auto-Combustion Method
by Danyal Ahmad, Asad Ali, Zahid Abbas, Abid Zaman, Amnah Mohammed Alsuhaibani, Vineet Tirth, Mahidur R. Sarker, Nor Azwan Mohamed Kamari, Ali Algahtani and Mohammed Aljohani
Crystals 2023, 13(3), 495; https://doi.org/10.3390/cryst13030495 - 14 Mar 2023
Cited by 5 | Viewed by 3113
Abstract
Nanoparticles where holmium was substituted with nickel-cadmium Ni0.5Cd0.5HoxFe2-xO4 (X = 0, 0.02, and 0.04) ferrites were synthesized through a sol-gel auto-combustion process to reveal their structural and physical properties. The synthesized nanoparticles were characterized [...] Read more.
Nanoparticles where holmium was substituted with nickel-cadmium Ni0.5Cd0.5HoxFe2-xO4 (X = 0, 0.02, and 0.04) ferrites were synthesized through a sol-gel auto-combustion process to reveal their structural and physical properties. The synthesized nanoparticles were characterized using X-ray diffraction (XRD), a scanning electron microscope (SEM), Fourier transform infrared ray (FTIR) spectroscopy, and impedance spectroscopy techniques. XRD revealed the formation of the cubic crystal structure had a preferential orientation along (311). By including holmium, the lattice constant was reduced, while the average crystallite size was increased. SEM analysis revealed that the nanoparticles exhibited regular shapes, and the average grain size increased with the holmium content. FTIR spectroscopy determined that all the organic and inorganic materials had an absorption range of 400 to 4000 cm−1. The dielectric properties were measured between the frequency ranges of 1 kHz and 2 MHz. This shows that the tangent loss and the dielectric constant were raised when the concentration of holmium was increased. Full article
(This article belongs to the Special Issue Nanomaterials: Nanostructures and Magnetic Semiconductors)
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10 pages, 1351 KiB  
Article
Effect of Grain-Size in Nanocrystalline Tungsten on Hardness and Dislocation Density: A Molecular Dynamics Study
by Toufik Karafi, Abdellah Tahiri, Hanae Chabba, Mohamed Idiri and Brahim Boubeker
Crystals 2023, 13(3), 469; https://doi.org/10.3390/cryst13030469 - 9 Mar 2023
Cited by 3 | Viewed by 2634
Abstract
We have simulated a series of nanoindentation experiments on nanocrystalline tungsten specimens using a combination of molecular dynamics simulations and the embedded atom method potential. The research aimed to investigate the impact of grain size on the mechanical properties of tungsten. Nanoindentation is [...] Read more.
We have simulated a series of nanoindentation experiments on nanocrystalline tungsten specimens using a combination of molecular dynamics simulations and the embedded atom method potential. The research aimed to investigate the impact of grain size on the mechanical properties of tungsten. Nanoindentation is a technique used to measure the mechanical properties of materials at a small scale. In this study, the researchers varied the grain size of the tungsten specimens, ranging from 7.9 to 10.5 nanometers. They also applied a loading rate of 3 angstroms per picosecond at a temperature of 300 Kelvin. The study found that as the grain size increased, the hardness increased, and the elastic modulus decreased. Hardness is a measure of a material’s resistance to deformation, and the elastic modulus is a measure of a material’s stiffness. The findings suggest that as the grain size of tungsten increases, the material becomes harder but less stiff. Additionally, the study explored the ways in which nanocrystalline tungsten deformed during nanoindentation. The researchers found that the deformation of the material was primarily due to dislocation activity, which is consistent with previous research on the topic. Overall, the findings of this research provide valuable insights into the mechanical properties of nanocrystalline tungsten and the ways in which the material deforms under stress. These findings could have practical applications in the development of materials for use in various industries. Full article
(This article belongs to the Special Issue Nanomaterials: Nanostructures and Magnetic Semiconductors)
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