Graphene Functionalization and Interface Effects

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 7340

Special Issue Editor

Deep Science Fund, Intellectual Ventures, Bellevue, WA 98005, USA
Interests: graphene; CVD; 2D materials; interface effects

Special Issue Information

Dear colleagues,

Surface functionalization and interface effects offer an extensive toolbox to engineer the properties of graphene and make it a versatile platform for a wide range of applications. This Special Issue of Nanomaterials will explore the complex interplay of graphene with its interface and the various ways of functionalizing its surface. We welcome contributions on innovations that utilize functionalization or interface effects as an enabling feature, for example, the antibody functionalization of graphene may enable selective biosensing.

While surface functionalization and interface effects are a great opportunity to design new modalities, they may also cause undesirable effects that hinder the use of graphene in applications. Therefore, we equally welcome contributions that bring an understanding of these parasitic interface effects and thereby outline a pathway to mitigating them.

Dr. Philipp Braeuninger-Weimer
Guest Editor

Manuscript Submission Information

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Keywords

  • Graphene
  • Interface
  • Functionalization
  • Surface effect
  • Biosensing

Published Papers (3 papers)

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Research

11 pages, 15017 KiB  
Article
Facile Pretreatment of Three-Dimensional Graphene through Electrochemical Polarization for Improved Electrocatalytic Performance and Simultaneous Electrochemical Detection of Catechol and Hydroquinone
by Huaxu Zhou, Guotao Dong, Ajabkhan Sailjoi and Jiyang Liu
Nanomaterials 2022, 12(1), 65; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12010065 - 27 Dec 2021
Cited by 21 | Viewed by 2221
Abstract
Three-dimensional graphene (3DG) with macroporous structure has great potential in the field of electroanalysis owing to a large active area, excellent electron mobility and good mass transfer. However, simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability is still a challenge. [...] Read more.
Three-dimensional graphene (3DG) with macroporous structure has great potential in the field of electroanalysis owing to a large active area, excellent electron mobility and good mass transfer. However, simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability is still a challenge. Here, a fast and convenient electrochemical polarization method is established to pretreat free-standing 3DG (p-3DG) to offer high electrocatalytic ability. 3DG with monolithic and macroporous structure prepared by chemical vapor deposition (CVD) is applied as the starting electrode. Electrochemical polarization is performed using electrochemical oxidation (anodization) at high potential (+6 V) followed with electrochemical reduction (cathodization) at low potential (−1 V), leading to exposure of edge of graphene and introduction of oxygen-containing groups. The as-prepared p-3DG displays increased hydrophilicity and improved electrocatalytic ability. As a proof of concept, p-3DG was used to selective electrochemical detection of two isomers of benzenediol, hydroquinone (p-BD) and catechol (o-BD). In comparison with initial 3DG, p-3DG exhibits increased reversibility of redox reaction, improved peak current and good potential resolution with high potential separation between p-BD and o-BD. Individual or selective determination of p-BD or o-BD in single substance solution or binary mixed solution is realized. Real analysis of pond water is also achieved. Full article
(This article belongs to the Special Issue Graphene Functionalization and Interface Effects)
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12 pages, 3297 KiB  
Article
High-Quality Graphene-Based Tunable Absorber Based on Double-Side Coupled-Cavity Effect
by Qiong Wang, Zhengbiao Ouyang, Mi Lin and Yaoxian Zheng
Nanomaterials 2021, 11(11), 2824; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11112824 - 24 Oct 2021
Cited by 3 | Viewed by 1720
Abstract
Graphene-based devices have important applications attributed to their superior performance and flexible tunability in practice. In this paper, a new kind of absorber with monolayer graphene sandwiched between two layers of dielectric rings is proposed. Two peaks with almost complete absorption are realized. [...] Read more.
Graphene-based devices have important applications attributed to their superior performance and flexible tunability in practice. In this paper, a new kind of absorber with monolayer graphene sandwiched between two layers of dielectric rings is proposed. Two peaks with almost complete absorption are realized. The mechanism is that the double-layer dielectric rings added to both sides of the graphene layer are equivalent to resonators, whose double-side coupled-cavity effect can make the incident electromagnetic wave highly localized in the upper and lower surfaces of graphene layer simultaneously, leading to significant enhancement in the absorption of graphene. Furthermore, the influence of geometrical parameters on absorption performance is investigated in detail. Also, the device can be actively manipulated after fabrication through varying the chemical potential of graphene. As a result, the frequency shifts of the two absorption peaks can reach as large as 2.82 THz/eV and 3.83 THz/eV, respectively. Such a device could be used as tunable absorbers and other functional devices, such as multichannel filters, chemical/biochemical modulators and sensors. Full article
(This article belongs to the Special Issue Graphene Functionalization and Interface Effects)
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18 pages, 5707 KiB  
Article
Electrochemical Response of Glucose Oxidase Adsorbed on Laser-Induced Graphene
by Sónia O. Pereira, Nuno F. Santos, Alexandre F. Carvalho, António J. S. Fernandes and Florinda M. Costa
Nanomaterials 2021, 11(8), 1893; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11081893 - 23 Jul 2021
Cited by 17 | Viewed by 2755
Abstract
Carbon-based electrodes have demonstrated great promise as electrochemical transducers in the development of biosensors. More recently, laser-induced graphene (LIG), a graphene derivative, appears as a great candidate due to its superior electron transfer characteristics, high surface area and simplicity in its synthesis. The [...] Read more.
Carbon-based electrodes have demonstrated great promise as electrochemical transducers in the development of biosensors. More recently, laser-induced graphene (LIG), a graphene derivative, appears as a great candidate due to its superior electron transfer characteristics, high surface area and simplicity in its synthesis. The continuous interest in the development of cost-effective, more stable and reliable biosensors for glucose detection make them the most studied and explored within the academic and industry community. In this work, the electrochemistry of glucose oxidase (GOx) adsorbed on LIG electrodes is studied in detail. In addition to the well-known electroactivity of free flavin adenine dinucleotide (FAD), the cofactor of GOx, at the expected half-wave potential of −0.490 V vs. Ag/AgCl (1 M KCl), a new well-defined redox pair at 0.155 V is observed and shown to be related to LIG/GOx interaction. A systematic study was undertaken in order to understand the origin of this activity, including scan rate and pH dependence, along with glucose detection tests. Two protons and two electrons are involved in this reaction, which is shown to be sensitive to the concentration of glucose, restraining its origin to the electron transfer from FAD in the active site of GOx to the electrode via direct or mediated by quinone derivatives acting as mediators. Full article
(This article belongs to the Special Issue Graphene Functionalization and Interface Effects)
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