The role of microwave absorption on formation of graphene from graphite oxide

Han, Hwataik; Zhao, Zongbin; Zhou, Qiugui; Gogotsi, Yury

doi:10.1016/j.carbon.2011.12.005

Cited by 261 publications

(160 citation statements)

References 40 publications

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“…The obtained diffraction peaks were asymmetric, which was seen as an increase in the peak width at lower angles. A similar asymmetry in the case of carbon nanostructures is associated with heterogeneity of the studied substance, e.g., when there is partial oxidation [27], disordered graphite planes and/ or amorphous sites [28]. Approximation of such peaks by a symmetrical profile can give some effective GCM sheet thickness (Fig.…”

Section: Resultsmentioning

confidence: 84%

Synthesis of Graphenic Carbon Materials on Nickel Particles with Controlled Quantity of Carbon

Grehov

Kalnacs

Mishnev

et al. 2016

Latvian Journal of Physics and Technical Sciences

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A cheap, comparatively simple and effective method is proposed for the large quantity production of the sheets of graphenic carbon materials (GCM) by annealing the mixture of nickel powder with a suitable carbon amount at the temperatures close to 1000 ºC. The number of graphene layers in the sheets of GCM may be varied by altering the amount of carbon in the mixture and parameters of annealing and drying of the obtained products. Samples of GCM were prepared in the form of heat-dried GCM paper and in the form of graphene sponge with freeze-drying. The appearance of GCM on the surface of Ni particles was identified using a scanning electron microscope (SEM) at a low accelerating voltage of 5 kV. The thickness and properties of the layers were investigated by electron microscopy and X-ray diffraction. The fabrication processes were carried out at the concentrations of added carbon from 0 to 1 at%. The results obtained are fully consistent with the well-known solid phase reactions of carbon dissolution in Ni at 1000 °C and graphene or graphite precipitation on the surface with cooling down to the room temperatures.

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Section: Resultsmentioning

confidence: 84%

Synthesis of Graphenic Carbon Materials on Nickel Particles with Controlled Quantity of Carbon

Grehov

Kalnacs

Mishnev

et al. 2016

Latvian Journal of Physics and Technical Sciences

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“…GO was prepared via a modified Hummers' method reported elsewhere 44 . The EFG was synthesized by heating the mixture of EDA (120 ml) and GO suspension (90 ml, 1 mg ml À 1 ) at 75°C for 6 h in a sealed glass vessel.…”

Section: Methodsmentioning

confidence: 99%

Enhancing lithium–sulphur battery performance by strongly binding the discharge products on amino-functionalized reduced graphene oxide

et al. 2014

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Lithium-sulphur batteries are one very appealing power source with high energy density. But their practical use is still hindered by several issues including short lifespan, low efficiency and safety concern from the lithium anode. Polysulphide dissolution and insulating nature of sulphur are generally considered responsible for the capacity degradation. However, the detachment of discharge products, that is, highly polar lithium sulphides, from nonpolar carbon matrix (for example, graphene) has been rarely studied as one critical factor. Here we report the strongly covalent stabilization of sulphur and its discharge products on aminofunctionalized reduced graphene oxide that enables stable capacity retention of 80% for 350 cycles with high capacities and excellent high-rate response up to 4 C. The present study demonstrates a feasible and effective strategy to solve the long-term cycling difficulty for lithium-sulphur batteries and also helps to understand the capacity decay mechanism involved.

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“…Li et al [30], heated GO by microwave at over 400°C within 2 s and the D/G ratio was observed by Raman spectroscopy to have decreased from 1.17 to 2.75 after microwave irradiation. Zhu et al [31] and Hu et al [32] reported an increase of C/O ratio after the microwave reduction of GO.…”

Section: Microwave Heating Of Cntsmentioning

confidence: 99%

Microwave heating of carbon-based solid materials

Kim

Lee²,

Lee³

2014

Carbon letters

137

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As a part of the electromagnetic spectrum, microwaves heat materials fast and efficiently via direct energy transfer, while conventional heating methods rely on conduction and convection. To date, the use of microwave heating in the research of carbon-based materials has been mainly limited to liquid solutions. However, more rapid and efficient heating is possible in electron-rich solid materials, because the target materials absorb the energy of microwaves effectively and exclusively. Carbon-based solid materials are suitable for microwave-heating due to the delocalized pi electrons from sp2-hybridized carbon networks. In this perspective review, research on the microwave heating of carbon-based solid materials is extensively investigated. This review includes basic theories of microwave heating, and applications in carbon nanotubes, graphite and other carbon-based materials. Finally, priority issues are discussed for the advanced use of microwave heating, which have been poorly understood so far: heating mechanism, temperature control, and penetration depth.

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The role of microwave absorption on formation of graphene from graphite oxide

Cited by 261 publications

References 40 publications

Synthesis of Graphenic Carbon Materials on Nickel Particles with Controlled Quantity of Carbon

Synthesis of Graphenic Carbon Materials on Nickel Particles with Controlled Quantity of Carbon

Enhancing lithium–sulphur battery performance by strongly binding the discharge products on amino-functionalized reduced graphene oxide

Microwave heating of carbon-based solid materials

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