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Theoretical and Experimental Electromagnetics of Graphene and Nanocarbon Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Carbon Materials".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 5024

Special Issue Editors


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Guest Editor
Faculty of Science and Forestry, Department of Physics and Mathematics, University of Eastern Finland, 70211 Kuopio, Finland
Interests: 2D materials; carbon nanotube; CVD synthesis; detector; graphene; microwave; nanocarbon; passive device; emitters; polymer composite; spectroscopy; terahertz
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Guest Editor
Department of Information and Electrical Engineering and Applied Mathematics, University of Salerno, 84084 Fisciano, Italy
Interests: electrical properties of composites filled with carbon nanotubes, image; video processing thin films and nanotechnology signal processing material characterization nanomaterials numerical modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Many efforts have been invested to understand the outstanding electromagnetic properties of carbon nanotubes, graphene, and other forms of nanocarbon, their composites, metasurfaces, and porous structures.

In order to predict the electromagnetic response of an ensemble of individual inclusions, their electromagnetic response should be modeled by means of ab initio calculations, semiclassical theory, and classical electromagnetics, in combination with relevant effective medium and percolations theories/simulation strategies. Regular and irregular structures, metamaterials and metasurfaces, and architectures made of those compositions are further numerically or, in the case of simple geometries, analytically modeled, closing the loop.

Plenty of experimental techniques are known to be able to obtain a wide collection of data, including broadband dielectric spectroscopy, microwave waveguide and free-standing measurements, free electron lasers and backward oscillators generating high- and low-power THz and GHz pulses, voltammetry, impedancemetry, and many others, which allow gathering complementary knowledge of the electromagnetic behavior of materials and devices. Along with conventional approaches, highly sensitive resonator-based and photonic jet approaches allow monitoring electromagnetic properties with super-resolution.

Tuning and adjusting the constituent properties of materials (nano, meta, and composites) allow designing a variety of electromagnetic devices, both passive and active, whose robustness may be controlled at many levels, e.g., through control of the influence of nanomaterials’ imperfection on the final performance, analysis of deviation at the stage of technological steps of material/device fabrication, and due to the measurements.

All these subtopics represent the focus of the present Special Issue on theoretical and experimental electromagnetics of graphene and nanocarbon materials. 

Prof. Dr. Polina P. Kuzhir
Dr. Patrizia Lamberti
Guest Editors

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Keywords

  • graphene
  • carbon nanotube
  • nanocarbon
  • microwave
  • terahertz
  • dielectric spectroscopy
  • impedancemetry
  • passive device
  • emitters
  • sensor
  • detector
  • carbon-based polymer composite
  • metasurface
  • porous carbon

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Published Papers (2 papers)

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Research

13 pages, 7338 KiB  
Article
Electronic Structure of NdFeCoB Oxide Magnetic Particles Studied by DFT Calculations and XPS
by Vadim Yu. Samardak, Alexander A. Komissarov, Alexander A. Dotsenko, Vladimir V. Korochentsev, Ivan S. Osmushko, Anton A. Belov, Pavel S. Mushtuk, Valerii A. Antonov, Ghader Ahmadpour, Farzad Nasirpouri, Alexander S. Samardak and Alexey V. Ognev
Materials 2023, 16(3), 1154; https://doi.org/10.3390/ma16031154 - 29 Jan 2023
Viewed by 1745
Abstract
Neodymium-iron-boron magnetic oxide powders synthesized by sol–gel Pechini method were studied by using X-ray photoelectron spectroscopy (XPS) and quantum chemical modeling. The powder structure was examined by using X-ray diffraction (XRD) and modeled by using density functional theory (DFT) approximation. The electronic structures [...] Read more.
Neodymium-iron-boron magnetic oxide powders synthesized by sol–gel Pechini method were studied by using X-ray photoelectron spectroscopy (XPS) and quantum chemical modeling. The powder structure was examined by using X-ray diffraction (XRD) and modeled by using density functional theory (DFT) approximation. The electronic structures of the core and valent regions were determined experimentally by using X-ray photoelectron spectroscopy and modeled by using quantum chemical methods. This study provides important insights into the electronic structure and chemical bonding of atoms of NdFeCoB oxide particles with the partial substitution of Fe by Co atoms. Full article
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12 pages, 3756 KiB  
Article
The Performance of Graphene-Enhanced THz Grating: Impact of the Gold Layer Imperfectness
by Patrizia Lamberti, Monica La Mura, Vincenzo Tucci, Erick Nkyalu, Ali Khan, Marina Yakovleva, Nadzeya Valynets, Alesia Paddubskaya, Aleksandr Saushin, Viatcheslav Vanyukov, Marian Baah, Andrzej Urbanowicz, Yuri Svirko and Polina Kuzhir
Materials 2022, 15(3), 786; https://doi.org/10.3390/ma15030786 - 20 Jan 2022
Cited by 6 | Viewed by 2651
Abstract
We report the performance of a graphene-enhanced THz grating fabricated by depositing a gold layer on the femtosecond micromachined SiO2 substrate. The morphology of the gold plated patterned substrate was studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM), while [...] Read more.
We report the performance of a graphene-enhanced THz grating fabricated by depositing a gold layer on the femtosecond micromachined SiO2 substrate. The morphology of the gold plated patterned substrate was studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM), while the quality of the chemical vapor deposition (CVD) graphene was evaluated by Raman spectroscopy. The electromagnetic (EM) response of the metasurface comprising the graphene sheet and the gold plated substrate was studied by THz time domain spectroscopy in the 100 GHz–1 THz frequency range. We employed the finite elements method (FEM) to model the metasurface EM response by adjusting the ac conductivity of the gold layer covering the patterned SiO2 substrate to reproduce the measured transmission/reflection spectra. The results of the numerical simulation reveal the impact of the imperfectness of the gold layer on the performance of the THz metasurface. The experimental results are well described in terms of the Drude–Smith model of metal conductivity that takes into account the anisotropic scattering of the carriers in thin metal films. Full article
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