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(rGO)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rGO表征.结果表明:气相反应温度为150℃,而液相反应温度为175℃时rGO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rGO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rGO的Rcc/co略增加.
Graphene oxide ( GO) was reduced by formaldehyde or formic acid in vapor or liquid phases below 200℃. 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℃ in the vapor phase and the liquid phase, 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) from XPS decreases with reac-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.
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