中文摘要：

在低于200℃下,以甲醛、甲酸为还原剂用两种不同的方法还原氧化石墨烯（GO）：一种是将GO与液态的还原剂反应（液相反应）;另一种是将GO与还原剂蒸气反应（气相反应）。分别研究了还原剂用量、还原温度和还原时间对还原的氧化石墨烯（r GO）电导率的影响,并通过X-射线衍射,X射线光电子能谱和拉曼光谱对代表性的r GO表征。结果表明：气相反应温度为150℃,而液相反应温度为175℃时r GO的电导率最大。与相对较短的反应时间相比,反应时间延长到24 h时,气相反应得到的r GO的C 1s峰相关的C—C和C—O的峰面积比（Rcc/co）明显下降,而液相反应得到的r GO的Rcc/co略增加。

英文摘要：

Graphene oxide （GO） was reduced by formaldehyde or formic acid in vapor or liquid phases below 200 益.The influ-ence of the concentrations of reducing agents,reaction temperature and time on the electrical conductivity of the reduced graphene oxide （rGO） was investigated. The rGOs were characterized by XRD,XPS and Raman spectroscopy. Results show that the opti-mum reaction temperatures are 150 and 175 益 in the vapor phase and the liquid p h a se, respectively,based on the electrical conduc-tivities of the rGOs. The ratio of the areas of the C 1s peaks related to the C-C and C-O（Rcc/Co）fromXPSdecreaseswithreac- tion time from 9 to 24 h in the vapor phase,and increases from 2 to 24 h in the liquid phase,which are in agreement with the elec-trical conductivities and Raman results. Gasification of carbon atoms in GO sheets may be responsible for the decrease of Rcc/co with prolonged reaction time in the vapor phase.