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Micromachines
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Graphene Nanoelectronic Devices
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Graphene Nanoelectronic Devices

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: closed (20 December 2019) | Viewed by 10718

Special Issue Editor

Prof. Dr. Javier Martinez Rodrigo

E-Mail Website
Guest Editor
Institute for Optoelectronics Systems and Microtecnology (ISOM), E.T.S.I.Telecomunicación, Technical University of Madrid (UPM), 28040 Madrid, Spain
Interests: graphene; 2D materials; energy; nanotechnology; nanoelectronics; AFM
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Graphene has attracted increasing attention since 2004 due to its excellent mechanical, optical and electrical properties. Its high theoretical specific surface area and high electrical conductivity make it an attractive material for many industrial applications. Also, it is a transparent material that can be used for electrodes, solar cells, light emitting diodes (LEDs, OLEDs), touchscreens and LCD displays, and in the near future, its flexibility will let to create foldable and wearable devices. Its biocompatibility has also allowed the development of new sensors for the biomedical industry. In addition, as a consequence of the increasing demand for more efficient, longer-lasting and more compact portable electronic devices, the use of graphene in energy storage devices is one of the most promising applications. Finally, the combination of graphene with other 2D materials allows the creation of new devices.

In view of that, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel graphene nanoelectronic devices towards challenging applications in electronics, sensors, solar cells, optoelectronics, transducers and energy.

We look forward to receiving your submissions!

Prof. Dr. Javier Martinez Rodrigo
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. Micromachines 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

  • Graphene
  • Sensors
  • Nanotechnology
  • Energy
  • Biosensors
  • Solar cells
  • 2D materials

Published Papers (3 papers)

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Research

18 pages, 5097 KiB  
Article
Simultaneous Determination of Four DNA bases at Graphene Oxide/Multi-Walled Carbon Nanotube Nanocomposite-Modified Electrode
by Shuting Wang, Celia Ferrag, Meissam Noroozifar and Kagan Kerman
Micromachines 2020, 11(3), 294; https://doi.org/10.3390/mi11030294 - 11 Mar 2020
Cited by 13 | Viewed by 3004
Abstract
In this study, we developed a modified glassy carbon electrode (GCE) with graphene oxide, multi-walled carbon nanotube hybrid nanocomposite in chitosan (GCE/GO-MWCNT-CHT) to achieve simultaneous detection of four nucleobases (i.e., guanine (G), adenine (A), thymine (T) and cytosine (C)) along with uric acid [...] Read more.
In this study, we developed a modified glassy carbon electrode (GCE) with graphene oxide, multi-walled carbon nanotube hybrid nanocomposite in chitosan (GCE/GO-MWCNT-CHT) to achieve simultaneous detection of four nucleobases (i.e., guanine (G), adenine (A), thymine (T) and cytosine (C)) along with uric acid (UA) as an internal standard. The nanocomposite was characterized using TEM and FT-IR. The linearity ranges were up to 151.0, 78.0, 79.5, 227.5, and 162.5 µM with a detection limit of 0.15, 0.12, 0.44, 4.02, 4.0, and 3.30 µM for UA, G, A, T, and C, respectively. Compared to a bare GCE, the nanocomposite-modified GCE demonstrated a large enhancement (~36.6%) of the electrochemical active surface area. Through chronoamperometric studies, the diffusion coefficients (D), standard catalytic rate constant (Ks), and heterogenous rate constant (Kh) were calculated for the analytes. Moreover, the nanocomposite-modified electrode was used for simultaneous detection in human serum, human saliva, and artificial saliva samples with recovery values ranging from 95% to 105%. Full article
(This article belongs to the Special Issue Graphene Nanoelectronic Devices)
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11 pages, 5767 KiB  
Article
Advanced Graphene-Based Transparent Conductive Electrodes for Photovoltaic Applications
by Susana Fernández, Alberto Boscá, Jorge Pedrós, Andrea Inés, Montserrat Fernández, Israel Arnedo, José Pablo González, Marina de la Cruz, David Sanz, Antonio Molinero, Rajveer Singh Fandan, María Ángela Pampillón, Fernando Calle, José Javier Gandía, Julio Cárabe and Javier Martínez
Micromachines 2019, 10(6), 402; https://doi.org/10.3390/mi10060402 - 17 Jun 2019
Cited by 15 | Viewed by 3931
Abstract
New architectures of transparent conductive electrodes (TCEs) incorporating graphene monolayers in different configurations have been explored with the aim to improve the performance of silicon-heterojunction (SHJ) cell front transparent contacts. In SHJ technology, front electrodes play an important additional role as anti-reflectance (AR) [...] Read more.
New architectures of transparent conductive electrodes (TCEs) incorporating graphene monolayers in different configurations have been explored with the aim to improve the performance of silicon-heterojunction (SHJ) cell front transparent contacts. In SHJ technology, front electrodes play an important additional role as anti-reflectance (AR) coatings. In this work, different transparent-conductive-oxide (TCO) thin films have been combined with graphene monolayers in different configurations, yielding advanced transparent electrodes specifically designed to minimize surface reflection over a wide range of wavelengths and angles of incidence and to improve electrical performance. A preliminary analysis reveals a strong dependence of the optoelectronic properties of the TCEs on (i) the order in which the different thin films are deposited or the graphene is transferred and (ii) the specific TCO material used. The results shows a clear electrical improvement when three graphene monolayers are placed on top on 80-nm-thick ITO thin film. This optimum TCE presents sheet resistances as low as 55 Ω/sq and an average conductance as high as 13.12 mS. In addition, the spectral reflectance of this TCE also shows an important reduction in its weighted reflectance value of 2–3%. Hence, the work undergone so far clearly suggests the possibility to noticeably improve transparent electrodes with this approach and therefore to further enhance silicon-heterojunction cell performance. These results achieved so far clearly open the possibility to noticeably improve TCEs and therefore to further enhance SHJ contact-technology performance. Full article
(This article belongs to the Special Issue Graphene Nanoelectronic Devices)
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11 pages, 2681 KiB  
Article
Hyaluronate-Functionalized Graphene for Label-Free Electrochemical Cytosensing
by Aihua Jing, Chunxin Zhang, Gaofeng Liang, Wenpo Feng, Zhengshan Tian and Chenhuan Jing
Micromachines 2018, 9(12), 669; https://doi.org/10.3390/mi9120669 - 18 Dec 2018
Cited by 10 | Viewed by 3381
Abstract
Electrochemical sensors for early tumor cell detection are currently an important area of research, as this special region directly improves the efficiency of cancer treatment. Functional graphene is a promising alternative for selective recognition and capture of target cancer cells. In our work, [...] Read more.
Electrochemical sensors for early tumor cell detection are currently an important area of research, as this special region directly improves the efficiency of cancer treatment. Functional graphene is a promising alternative for selective recognition and capture of target cancer cells. In our work, an effective cytosensor of hyaluronate-functionalized graphene (HG) was prepared through chemical reduction of graphene oxide. The as-prepared HG nanostructures were characterized with Fourier transform infrared spectroscopy and transmission electron microscopy coupled with cyclic voltammograms and electrochemical impedance spectroscopy, respectively. The self-assembly of HG with ethylene diamine, followed by sodium hyaluronate, enabled the fabrication of a label-free electrochemical impedance spectroscopy cytosensor with high stability and biocompatibility. Finally, the proposed cytosensor exhibited satisfying electrochemical behavior and cell-capture capacity for human colorectal cancer cells HCT-116, and also displayed a wide linear range, from 5.0 × 102 cells∙mL−1 to 5.0 × 106 cells∙mL−1, and a low detection limit of 100 cells∙mL−1 (S/N = 3) for quantification. This work paves the way for graphene applications in electrochemical cytosensing and other bioassays. Full article
(This article belongs to the Special Issue Graphene Nanoelectronic Devices)
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