Reduction of graphene oxide by electron beam generated plasmas produced in methane/argon mixtures

Baraket, Mira; Walton, Scott G.; Wei, Zhongqing; Lock, Evgeniya H.; Robinson, Jeremy T.; Sheehan, Paul E.

doi:10.1016/j.carbon.2010.05.031

Cited by 104 publications

(68 citation statements)

References 30 publications

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“…4, where contributions from C-O, CvO and O-CvO bonds can be distinguished. 27 For this sample, they can be easily detected at 45°and 90°t ake-off angles, and the C-O signal increases in intensity with the explored depth, which is indicative of their presence in an intermediate contamination layer between the two graphene sheets. In this case, the analysis of the Si 2p signal (see ESI †) allows an estimation of the distance from the sample surface to the non-oxidized Si substrate to be in the order of 5 nm.…”

Section: Arxps Analysismentioning

confidence: 77%

Determination of a refractive index and an extinction coefficient of standard production of CVD-graphene

et al. 2015

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The refractive index and extinction coefficient of chemical vapour deposition grown graphene are determined by ellipsometry analysis. Graphene films were grown on copper substrates and transferred as both monolayers and bilayers onto SiO 2 /Si substrates by using standard manufacturing procedures. The chemical nature and thickness of residual debris formed after the transfer process were elucidated using photoelectron spectroscopy. The real layered structure so deduced has been used instead of the nominal one as the input in the ellipsometry analysis of monolayer and bilayer graphene, transferred onto both native and thermal silicon oxide. The effect of these contamination layers on the optical properties of the stacked structure is noticeable both in the visible and the ultraviolet spectral regions, thus masking the graphene optical response. Finally, the use of heat treatment under a nitrogen atmosphere of the graphene-based stacked structures, as a method to reduce the water content of the sample, and its effect on the optical response of both graphene and the residual debris layer are presented. The Lorentz-Drude model proposed for the optical response of graphene fits fairly well the experimental ellipsometric data for all the analysed graphene-based stacked structures.

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Section: Arxps Analysismentioning

confidence: 77%

Determination of a refractive index and an extinction coefficient of standard production of CVD-graphene

et al. 2015

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“…The methods are cost-effective, environment friendly and can be conducted at low temperature as well as in gas, liquid or even solid phase, at the same time easy scaled-up production is possible to achieve. Although, EB has been applied for the efficient reduction of GO but it has also some shortcomings [106,107]. EB irradiation deposits most of the energy on the surface of samples, which limits the sample size, uniformity and treatment depth.…”

Section: Light and Radiation Induced Reductionmentioning

confidence: 99%

Alternative methods and nature-based reagents for the reduction of graphene oxide: A review

Thakur

Karak

2015

Carbon

202

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“…[106][107][108][109][110][111][112][113] Because of the high energy per unit pulse of the light, the bonds between the graphene sheet and the oxygen functionalities in GO can be destroyed to produce RGO with relatively less impurity. Moreover, this method can be exploited for nanopatterning and for large-scale production of reduced graphene oxide.…”

Section: Photoreductionmentioning

confidence: 99%

Recent Advances in Effective Reduction of Graphene Oxide for Highly Improved Performance Toward Electrochemical Energy Storage

Zhang

Li²,

Zhang

et al. 2018

Energy & Environ Materials

132

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The demand for high‐quality graphene from various applications promotes the exploration of various synthesis methods such as chemical vapor deposition, chemical reduction of graphite oxide, liquid‐phase exfoliation, and electrochemical exfoliation. Among those, chemical treatments for the production of reduced graphene oxide (RGO) dictate the current technologies for mass production of graphene powder. However, such conventional chemical reduction methods are rather ineffective in removing oxygen‐containing functional groups from graphene oxide (GO), with resultant RGO products containing high level of structural defects. This leads to significantly damaged crystallinity and drastically lowered electric and thermal conductivity, which is probably the main bottleneck to limit the performance of RGO‐based materials. Great efforts such as thermal reduction, microwave‐irradiation reduction, or other novel reduction methods (e.g., photoreduction) have been developed to repair defects in RGO materials. This perspective review is to outline the latest advances toward effective reduction of GO for significantly enhanced properties. We demonstrate that effectively repaired RGO with large specific surface area and highly improved crystallinity is key to highly improved electric and thermal conductivity, thus leading to significantly enhanced properties essential for chemical energy storage devices.

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Reduction of graphene oxide by electron beam generated plasmas produced in methane/argon mixtures

Cited by 104 publications

References 30 publications

Determination of a refractive index and an extinction coefficient of standard production of CVD-graphene

Determination of a refractive index and an extinction coefficient of standard production of CVD-graphene

Alternative methods and nature-based reagents for the reduction of graphene oxide: A review

Recent Advances in Effective Reduction of Graphene Oxide for Highly Improved Performance Toward Electrochemical Energy Storage

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