School of Information Science and Technology, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
Nanoscale Res Lett. 2012 Jul 2;7(1):363. doi: 10.1186/1556-276X-7-363.
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.
我们使用直流（DC）测量和交流（AC）复阻抗谱研究了水吸附对氧化石墨烯（GO）薄膜电性能的影响。通过改进的 Hummer 法合成的 GO 悬浮液沉积在 Au 叉指电极上。通过电特性观察到水分子与 GO 薄膜的强烈电相互作用。直流测量结果表明，GO 薄膜的电性能与湿度和外加电压幅度有关。交流复阻抗谱方法用于详细分析水分子与 GO 薄膜之间电相互作用的机制。在低湿度下，GO 薄膜表现出较差的导电性，可以看作是绝缘体。然而，在高湿度下，由于离子传导的增强，GO 薄膜的电导率增加。我们对这种效应的系统研究为源于溶液处理氧化石墨烯的石墨烯器件的发展提供了基础支持。
