The effect of ambient humidity on the electrical properties of graphene oxide films.
The effect of ambient humidity on the electrical properties of graphene oxide films.
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环境湿度对氧化石墨烯薄膜电性能的影响
DOI：
10.1186/1556-276x-7-363
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发表时间：
2012-07-02
影响因子：
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通讯作者：
Li X
中科院分区：
文献类型：
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作者：
Yao Y;Chen X;Zhu J;Zeng B;Wu Z;Li X
我们研究了水吸附对氧化石墨烯（GO）薄膜的电性能的影响，使用直流（DC）测量和交流（AC）复阻抗谱。将通过改进的Hummer方法合成的GO悬浮液沉积在Au叉指电极上。水分子与GO膜的电相互作用很强，通过电学表征观察到。直流测量结果表明，GO薄膜的电学性能是湿度和施加电压的幅度依赖。采用交流复阻抗谱方法详细分析了水分子与GO膜之间的电相互作用机理。在低湿度下，GO膜表现出差的导电性，并且可以被视为绝缘体。然而，在高湿度下，由于离子传导的增强，GO膜的电导率增加。我们对这一效应的系统研究为开发溶液处理氧化石墨烯的石墨烯器件提供了基础支持。
We investigate the effect of water adsorption on the electrical properties of graphene oxide (GO) films using the direct current (DC) measurement and alternating current (AC) complex impedance spectroscopy. GO suspension synthesized by a modified Hummer's method is deposited on Au interdigitated electrodes. The strong electrical interaction of water molecules with GO films was observed through electrical characterizations. The DC measurement results show that the electrical properties of GO films are humidity- and applied voltage amplitude-dependent. The AC complex impedance spectroscopy method is used to analyze the mechanism of electrical interaction between water molecules and GO films in detail. At low humidity, GO films exhibit poor conductivity and can be seen as an insulator. However, at high humidity, the conductivity of GO films increases due to the enhancement of ion conduction. Our systematic research on this effect provides the fundamental supports for the development of graphene devices originating from solution-processed graphene oxide.