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A Two-Step Method for the Preparation of Highly Conductive graphene film and Its Gas-Sensing Property

Materials Sciences and Applications 2015年第11期6卷 963-977页

作者： Tran Van Khai Tran Dai Lam Le Van Thu Hyoun Woo Kim Faculty of Materials Technology Ho Chi Minh City University of Technology Ho Chi Minh City Vietnam Institute of Material Science Vietnam Academy of Science and Technology Hanoi Vietnam Institute of Chemistry-Biology and Professional Documents Ministry of Public Security Hanoi Vietnam Division of Materials Science and Engineering Hanyang University Seoul Republic of Korea

In this research, a highly conductive graphene film was synthesized through the chemical reduction of graphene oxide (RGO) nanosheets followed by thermal treatment at 1100℃ (RGO-1100℃) under H2 ambient. The as-prepared graphene films were characterized by using X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy, X-ray diffractions, raman spectroscopy, transmission electron microscopy, scanning electron microscopy, atomic force microscopy and by electrical conductivity measurements. The results showed that the thermal treatment efficiently removed residual oxygen-containing functional groups on the surface of the RGO sheets and simultaneously restored the sp2 carbon networks in the graphene sheets. As a result, the electrical conductivity of RGO-1100℃ (~210 S/cm) film was greatly improved compared with that of RGO (~24 S/cm) and graphene oxide (4.2 × 10–4 S/m) films. In addition, the NO2 gas sensing characteristics of the as-prepared RGO films were studied. The results indicated that RGO films were highly responsive to NO2 at temperature of 200℃.

关键词： graphene graphene Oxide graphene-film Thermal Reduction

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