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℃.
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机译：在这项研究中，通过化学还原氧化石墨烯（RGO）纳米片，然后在H2环境下在1100℃（RGO-1100℃）进行热处理，合成了高导电性石墨烯薄膜。通过使用X射线光电子能谱，傅立叶变换红外光谱，X射线衍射，拉曼光谱，透射电子显微镜，扫描电子显微镜，原子力显微镜和电导率测量来表征所制备的石墨烯膜。结果表明，热处理有效地去除了RGO片材表面上残留的含氧官能团，同时恢复了石墨烯片材中的sp2碳网络。结果，与RGO（〜24 S / cm）和氧化石墨烯（4.2×10–4 S / m）膜相比，RGO-1100℃（〜210 S / cm）膜的电导率得到了极大的改善。此外，研究了所制备的RGO薄膜的NO2气敏特性。结果表明，RGO薄膜在200℃温度下对NO2具有高响应性。
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