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Special Issue "Graphene Oxide: Synthesis, Reduction, and Frontier Applications"

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

Deadline for manuscript submissions: 30 September 2019.

Special Issue Editor

Guest Editor
Dr. Alina Iuliana Pruna

University Politehnica of Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania
Website | E-Mail
Interests: Graphene composites; Supercapacitors; Optoelectronics; Electrochemical sensing; Photocatalysis; Surface modification; Corrosion

Special Issue Information

Dear Colleagues,

Graphene exhibits exceptional physico-chemical, mechanical, thermal, and optical properties that confer it with a potential for applications in various fields. In recent years, graphene oxide has received much attention as a precursor for the highly acclaimed graphene nanomaterial. Given its accompanying oxygen functional groups, graphene oxide exhibits a rich chemistry. The degree of oxidation in graphene oxide is one of the parameters employed in order to tailor its applications. Other aspects regard the properties of the starting graphite, the exfoliation of graphene oxide, and the subsequent reduction of graphene oxide that can be carried out via chemical, thermal, or electrochemical routes. In particular, the properties of graphene oxide open up new fields of application as high-performance electrodes in energy storage devices, sensing devices, gas adsorption, optoelectronics, or biomedical applications. However, it is challenging to make more efficient devices with required efficiencies by optimizing the availability, environmentally friendliness, and cost of raw materials, synthesis costs, and selecting the size-induced properties of graphene oxide nanomaterials.

It is my pleasure to invite you to submit reviews, regular research papers, and communications to this Special Issue on Graphene Oxide: Synthesis, Reduction, and Frontier Applications.

Dr. Alina Iuliana Pruna
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 papers will be 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. Materials 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 1800 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 oxide
  • Synthesis
  • Reduction
  • Optoelectronics
  • Supercapacitors
  • Sensors
  • Gas adsorption
  • Bio-composites

Published Papers (5 papers)

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Research

Jump to: Review

Open AccessArticle
Synthesis and Characterization of Chitosan/Reduced Graphene Oxide Hybrid Composites
Materials 2019, 12(13), 2077; https://doi.org/10.3390/ma12132077
Received: 16 May 2019 / Revised: 21 June 2019 / Accepted: 26 June 2019 / Published: 28 June 2019
PDF Full-text (4193 KB) | HTML Full-text | XML Full-text
Abstract
Graphene family materials (GFM) are currently considered to be one of the most interesting nanomaterials with a wide range of application. They can also be used as modifiers of polymer matrices to develop composite materials with favorable properties. In this study, hybrid nanocomposites [...] Read more.
Graphene family materials (GFM) are currently considered to be one of the most interesting nanomaterials with a wide range of application. They can also be used as modifiers of polymer matrices to develop composite materials with favorable properties. In this study, hybrid nanocomposites based on chitosan (CS) and reduced graphene oxide (rGO) were fabricated for potential use in bone tissue engineering. CS/rGO hydrogels were prepared by simultaneous reduction and composite formation in acetic acid or lactic acid and crosslinked with a natural agent—tannic acid (TAc). A broad spectrum of research methods was applied in order to thoroughly characterize both the components and the composite systems, i.e., X-ray Photoelectron Spectroscopy, X-ray Diffractometry, Attenuated Total Reflection Fourier-Transform Infrared Spectroscopy, Scanning Electron Microscopy, ninhydrin assay, mechanical testing, in vitro degradation and bioactivity study, wettability, and, finally, cytocompatibility. The composites formed through the self-assembly of CS chains and exfoliated rGO sheets. Obtained results allowed also to conclude that the type of solvent used impacts the polymer structure and its ability to interact with rGO sheets and the mechanical properties of the composites. Both rGO and TAc acted as crosslinkers of the polymer chains. This study shows that the developed materials demonstrate the potential for use in bone tissue engineering. The next step should be their detailed biological examinations. Full article
(This article belongs to the Special Issue Graphene Oxide: Synthesis, Reduction, and Frontier Applications)
Figures

Graphical abstract

Open AccessArticle
Thermal and Mechanical Interfacial Behaviors of Graphene Oxide-Reinforced Epoxy Composites Cured by Thermal Latent Catalyst
Materials 2019, 12(8), 1354; https://doi.org/10.3390/ma12081354
Received: 1 April 2019 / Revised: 17 April 2019 / Accepted: 24 April 2019 / Published: 25 April 2019
PDF Full-text (2997 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A series of composites was prepared from a diglycidyl ether of bisphenol A (DGEBA) with different graphene filler contents to improve their mechanical performance and thermal stability. Graphene oxide (GO) and GO modified with hexamethylene tetraamine (HMTA) were selected as reinforcing agents. As [...] Read more.
A series of composites was prepared from a diglycidyl ether of bisphenol A (DGEBA) with different graphene filler contents to improve their mechanical performance and thermal stability. Graphene oxide (GO) and GO modified with hexamethylene tetraamine (HMTA) were selected as reinforcing agents. As a latent cationic initiator and curing agent, N-benzylepyrizinium hexafluoroantimonate (N-BPH) was used. The effect of fillers and their contents on the mechanical properties and thermal stability of the composites were studied. Fracture toughness improved by 23% and 40%, and fracture energy was enhanced by 1.94- and 2.27-fold, for the composites containing 0.04 wt.% GO and HMTA-GO, respectively. The gradual increase in fracture toughness at higher filler contents was attributed to both crack deflection and pinning mechanisms. Maximum thermal stability in the composites was achieved by using up to 0.1 wt.% graphene fillers. Full article
(This article belongs to the Special Issue Graphene Oxide: Synthesis, Reduction, and Frontier Applications)
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Figure 1

Open AccessArticle
A Nanocomposite Based on Reduced Graphene and Gold Nanoparticles for Highly Sensitive Electrochemical Detection of Pseudomonas aeruginosa through Its Virulence Factors
Materials 2019, 12(7), 1180; https://doi.org/10.3390/ma12071180
Received: 24 March 2019 / Revised: 8 April 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
Cited by 1 | PDF Full-text (2989 KB) | HTML Full-text | XML Full-text
Abstract
Pyoverdine is a fluorescent siderophore produced by Pseudomonas aeruginosa that can be considered as a detectable marker in nosocomial infections. The presence of pyoverdine in water can be directly linked to the presence of the P. aeruginosa, thus being a nontoxic and [...] Read more.
Pyoverdine is a fluorescent siderophore produced by Pseudomonas aeruginosa that can be considered as a detectable marker in nosocomial infections. The presence of pyoverdine in water can be directly linked to the presence of the P. aeruginosa, thus being a nontoxic and low-cost marker for the detection of biological contamination. A novel platform was developed and applied for the electrochemical selective and sensitive detection of pyoverdine, based on a graphene/graphite-modified screen-printed electrode (SPE) that was electrochemically reduced and decorated with gold nanoparticles (NPs). The optimized sensor presenting higher sensitivity towards pyoverdine was successfully applied for its detection in real samples (serum, saliva, and tap water), in the presence of various interfering species. The excellent analytical performances underline the premises for an early diagnosis kit of bacterial infections based on electrochemical sensors. Full article
(This article belongs to the Special Issue Graphene Oxide: Synthesis, Reduction, and Frontier Applications)
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Open AccessArticle
Release of Cationic Drugs from Charcoal
Materials 2019, 12(4), 683; https://doi.org/10.3390/ma12040683
Received: 1 February 2019 / Revised: 18 February 2019 / Accepted: 21 February 2019 / Published: 25 February 2019
PDF Full-text (1548 KB) | HTML Full-text | XML Full-text
Abstract
The goal of this research is to improve preparation of charcoal adducts in a manner suitable for cationic drug release, possibly using an eco-friendly procedure. Charcoal, widely commercialized for human ingestion, is oxidized by hydrogen peroxide in mild conditions. Adducts of a cationic [...] Read more.
The goal of this research is to improve preparation of charcoal adducts in a manner suitable for cationic drug release, possibly using an eco-friendly procedure. Charcoal, widely commercialized for human ingestion, is oxidized by hydrogen peroxide in mild conditions. Adducts of a cationic drug (lidocaine hydrochloride, a medication used as local anesthetic) with charcoal are prepared after basification of charcoal and characterized mainly by elemental analysis, wide-angle X-ray diffraction, infrared spectroscopy and thermogravimetry. The drug in the prepared adducts is present in amount close to 30% by weight and can be readily released to both neutral and acidic aqueous solutions. Cation release, as studied by UV spectra of aqueous solutions, is faster in acidic solutions and is faster than for adducts with graphite oxide, which can be prepared only in harsh conditions. Full article
(This article belongs to the Special Issue Graphene Oxide: Synthesis, Reduction, and Frontier Applications)
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Review

Jump to: Research

Open AccessReview
Graphene Oxide and Its Inorganic Composites: Fabrication and Electrorheological Response
Materials 2019, 12(13), 2185; https://doi.org/10.3390/ma12132185
Received: 29 May 2019 / Revised: 4 July 2019 / Accepted: 5 July 2019 / Published: 7 July 2019
PDF Full-text (9485 KB) | HTML Full-text | XML Full-text
Abstract
Composite particles associated with graphene oxide (GO) and inorganic materials provide the synergistic properties of an appropriate electrical conductivity of GO with the good dielectric characteristics of inorganic materials, making them attractive candidates for electrorheological (ER) materials. This review paper focuses on the [...] Read more.
Composite particles associated with graphene oxide (GO) and inorganic materials provide the synergistic properties of an appropriate electrical conductivity of GO with the good dielectric characteristics of inorganic materials, making them attractive candidates for electrorheological (ER) materials. This review paper focuses on the fabrication mechanisms of GO/inorganic composites and their ER response when suspended in a non-conducting medium, including steady shear flow curves, dynamic yield stress, On-Off tests, and dynamic oscillation analysis. Furthermore, the morphologies of these composites, dielectric properties, and sedimentation of the ER fluids are covered. Full article
(This article belongs to the Special Issue Graphene Oxide: Synthesis, Reduction, and Frontier Applications)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Prof. Dr.  Hab. Cecilia  Cristea

2. Professor Lingxue Kong

3. Dr. Szabo Tamas

4. Dr hab. Marek Wiśniewski

5. Professor Nicholas Dunne

6. Professor Hyoung Jin Choi

Review: "Graphene oxide and its composites: Fabrication and Electrorheological Response

7. Dr. Iren E. Kuznetsova

8. Professor Gerardine Botte

9. Prof. Dr. Jan Chłopek

Title: Synthesis and characterization of chitosan/reduced graphene oxide hybrid
composites

Abstract: Graphene family materials (GFM) are currently considered to be one of the most interesting nanomaterials with a wide range of application. They can also be used as modifiers of polymer matrices to develop composite materials with favorable properties. In this study, hybrid nanocomposites based on chitosan (CS) and reduced graphene oxide (rGO) were fabricated for potential use in bone tissue engineering. CS/rGO hydrogels were prepared by simultaneous reduction and composite formation in acetic acid or lactic acid, and crosslinked with a natural agent – tannic acid (TAc). A broad spectrum of research methods was applied in order to thoroughly characterize both the components and the composite systems, ie. XPS, XRD, ATR-FTIR, SEM, ninhydrin assay, mechanical testing, in vitro degradation and bioactivity study, wettability, and finally cytocompatibility. The composites formed through self-assembly of CS chains and exfoliated rGO sheets. Obtained results allowed also to conclude that the type of solvent used impacts the polymer structure and further its ability to interact with rGO sheets and the mechanical properties of the composites. Both, rGO and TAc, acted as crosslinkers of the polymer chains. The study showed that the developed materials definitely demonstrate potential for use in bone tissue engineering. The next step should be their detailed biological examinations.

10. Professor Gaetano Guerra

Release of cationic drugs from oxidized charcoal. In this manuscript the ability of graphene oxide and of oxidized charcoal to release in aqueous media cationic drugs are presented.

11. Professor Elena Sheka

Title: Graphene-oxyhydride carbon catalysts in view of spin radical chemistry of graphene

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