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Nanomaterials
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Graphene-Based Nanomaterials II
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Graphene-Based Nanomaterials II

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: 10 September 2024 | Viewed by 4382

Special Issue Editors

Prof. Dr. Nikolaos V. Kantartzis

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
Interests: electromagnetic compatibility; computational electromagnetics; metamaterials/metasurfaces; graphene; nanostructures; antennas; microwave structures; wireless power transfer
Special Issues, Collections and Topics in MDPI journals
Dr. Stamatios Amanatiadis

E-Mail Website
Guest Editor
1. Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Art Diagnosis Center, Ormylia Foundation, 63071 Ormylia, Chalkidiki, Greece
Interests: graphene analysis; electromagnetic numerical modeling; non-destructive evaluation, material characterization methods; Raman and FTIR spectroscopies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The rapid evolution of high-speed communications is pushing the frequency limits towards the millimeter-wave and THz regime. Here, a reconsideration of the materials and methods is required due to the degradation of the conventional ones. A perfect candidate for the aforementioned process is graphene, a truly two-dimensional carbon allotrope that presents extraordinary electromagnetic properties, despite its negligible thickness. Additionally, graphene-based nanomaterials such as graphene oxides, graphene inks, graphene quantum dots, etc. are constantly emerging because of their adjustability and the subsequent wide range of applications.

The main purpose of this Special Issue is to highlight the recent advances in graphene-based nanomaterials focusing on the analysis of their structure, the enhancement of their high-quality production, and their involvement in advanced electromagnetic devices for modern telecommunication systems. Specifically, original research and review articles should discuss one of the following aspects:

  • Novel graphene-based compositions;
  • Improved methods for high-quality production;
  • The development of numerical techniques considering advanced materials;
  • Analysis of unique electromagnetic properties;
  • The design of devices at mmW and THz frequencies.

Prof. Dr. Nikolaos V. Kantartzis
Dr. Stamatios Amanatiadis
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. Nanomaterials is an international peer-reviewed open access semimonthly 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 2900 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

  • graphene
  • graphene oxides
  • graphene inks
  • graphene quantum dots
  • electromagnetic properties

Published Papers (4 papers)

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Research

16 pages, 10656 KiB  
Article
Degradation of Graphene in High- and Low-Humidity Air, and Vacuum Conditions at 300–500 K
by Shunsuke Kawabata, Ryuichi Seki, Takumi Watanabe and Tomonori Ohba
Nanomaterials 2024, 14(2), 166; https://doi.org/10.3390/nano14020166 - 12 Jan 2024
Viewed by 696
Abstract
Graphene is a fundamental unit of carbon materials and, thus, primary sp2-bonded carbon material. Graphene is, however, easily broken macroscopically despite high mechanical strength, although its natural degradation has rarely been considered. In this work, we evaluate the natural degradation of [...] Read more.
Graphene is a fundamental unit of carbon materials and, thus, primary sp2-bonded carbon material. Graphene is, however, easily broken macroscopically despite high mechanical strength, although its natural degradation has rarely been considered. In this work, we evaluate the natural degradation of two-layer graphene in vacuo, in low-humidity air, and in high-humidity air at 300, 400, 450, and 500 K. Over 1000 days of degradation at 300 K, the graphene structure was highly maintained in vacuo, whereas the layer number of graphene tended to decrease in high- and low-humidity air. Water was slightly reacted/chemisorbed on graphene to form surface oxygen groups at 300 K. At 450 and 500 K, graphene was moderately volatilized in vacuo and was obviously oxidized in high- and low-humidity air. Surprisingly, the oxidation of graphene was more suppressed in the high-humidity air than in the low-humidity air, indicating that water worked as an anti-oxidizer of graphene by preventing the chemisorption of oxygen on the graphene surface. Full article
(This article belongs to the Special Issue Graphene-Based Nanomaterials II)
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15 pages, 7224 KiB  
Article
Electrochemical Synthesis of Functionalized Graphene/Polyaniline Composite Using Two Electrode Configuration for Supercapacitors
by Dongsheng Yu, Jili Li, Tiekun Jia, Binbin Dong, Zhixiao Han, Wenjie Tian, Ruilin Jiang, Xi Lu and Lekang Li
Nanomaterials 2023, 13(24), 3140; https://doi.org/10.3390/nano13243140 - 14 Dec 2023
Cited by 1 | Viewed by 763
Abstract
An effective approach for the large-scale fabrication of conducting polyaniline (PANI) using in situ anodic electrochemical polymerization on nickel foam which had been coated in aryl diazonium salt (ADS)-modified graphene (ADS-G). In the present work, ADS-G was used as a high surface-area support [...] Read more.
An effective approach for the large-scale fabrication of conducting polyaniline (PANI) using in situ anodic electrochemical polymerization on nickel foam which had been coated in aryl diazonium salt (ADS)-modified graphene (ADS-G). In the present work, ADS-G was used as a high surface-area support material for the electrochemical polymerization of PANI. The electrochemical performances of the ADS-G/PANI composites exhibited better suitability as supercapacitor electrode materials than those of the PANI. The ADS-G/PANI composites achieved a specific capacitance of 528 F g−1, which was higher than that of PANI (266 F g−1) due to excellent electrode–electrolyte interaction and the synergistic effect of electrical conductivity between ADS-G and PANI in the composites. These findings suggest that the ADS-G/PANI composites are a suitable composite for potential supercapacitor applications. Full article
(This article belongs to the Special Issue Graphene-Based Nanomaterials II)
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24 pages, 10396 KiB  
Article
Exploring Nitrogen-Functionalized Graphene Composites for Urinary Catheter Applications
by Rita Teixeira-Santos, Luciana C. Gomes, Rita Vieira, Francisca Sousa-Cardoso, Olívia S. G. P. Soares and Filipe J. Mergulhão
Nanomaterials 2023, 13(18), 2604; https://doi.org/10.3390/nano13182604 - 21 Sep 2023
Cited by 1 | Viewed by 1200
Abstract
Graphene has been broadly studied, particularly for the fabrication of biomedical devices, owing to its physicochemical and antimicrobial properties. In this study, the antibiofilm efficacy of graphene nanoplatelet (GNP)-based composites as coatings for urinary catheters (UCs) was investigated. GNPs were functionalized with nitrogen [...] Read more.
Graphene has been broadly studied, particularly for the fabrication of biomedical devices, owing to its physicochemical and antimicrobial properties. In this study, the antibiofilm efficacy of graphene nanoplatelet (GNP)-based composites as coatings for urinary catheters (UCs) was investigated. GNPs were functionalized with nitrogen (N-GNP) and incorporated into a polydimethylsiloxane (PDMS) matrix. The resulting materials were characterized, and the N-GNP/PDMS composite was evaluated against single- and multi-species biofilms of Staphylococcus aureus, Pseudomonas aeruginosa, and Klebsiella pneumoniae. Both biofilm cell composition and structure were analyzed. Furthermore, the antibacterial mechanisms of action of N-GNP were explored. The N-GNP/PDMS composite showed increased hydrophobicity and roughness compared to PDMS. In single-species biofilms, this composite significantly reduced the number of S. aureus, P. aeruginosa, and K. pneumoniae cells (by 64, 41, and 29%, respectively), and decreased S. aureus biofilm culturability (by 50%). In tri-species biofilms, a 41% reduction in total cells was observed. These results are aligned with the outcomes of the biofilm structure analysis. Moreover, N-GNP caused changes in membrane permeability and triggered reactive oxygen species (ROS) synthesis in S. aureus, whereas in Gram-negative bacteria, it only induced changes in cell metabolism. Overall, the N-GNP/PDMS composite inhibited biofilm development, showing the potential of these carbon materials as coatings for UCs. Full article
(This article belongs to the Special Issue Graphene-Based Nanomaterials II)
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12 pages, 676 KiB  
Article
Robust FDTD Modeling of Graphene-Based Conductive Materials with Transient Features for Advanced Antenna Applications
by Pablo H. Zapata Cano, Stamatios Amanatiadis, Zaharias D. Zaharis, Traianos V. Yioultsis, Pavlos I. Lazaridis and Nikolaos V. Kantartzis
Nanomaterials 2023, 13(3), 384; https://doi.org/10.3390/nano13030384 - 18 Jan 2023
Cited by 2 | Viewed by 1230
Abstract
The accurate modeling of frequency-dispersive materials is a challenging task, especially when a scheme with a transient nature is utilized, as it is the case of the finite-difference time-domain method. In this work, a novel implementation for the modeling of graphene-oriented dispersive materials [...] Read more.
The accurate modeling of frequency-dispersive materials is a challenging task, especially when a scheme with a transient nature is utilized, as it is the case of the finite-difference time-domain method. In this work, a novel implementation for the modeling of graphene-oriented dispersive materials via the piecewise linear recursive convolution scheme, is introduced, while the time-varying conductivity feature is, additionally, launched. The proposed algorithm is employed to design a reduced graphene-oxide antenna operating at 6 GHz. The transient response to graphene’s conductivity variations is thoroughly studied and a strategy to enhance the antenna performance by exploiting the time-varying graphene oxide is proposed. Finally, the use of the featured antenna for modern sensing applications is demonstrated through the real-time monitoring of voltage variation. Full article
(This article belongs to the Special Issue Graphene-Based Nanomaterials II)
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