Electrical Assembly and Reduction of Graphene Oxide in a Single Solution Step for Use in Flexible Sensors
Electrical Assembly and Reduction of Graphene Oxide in a Single Solution Step for Use in Flexible Sensors
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在单一解决方案步骤中电组装和还原氧化石墨烯，用于柔性传感器
DOI：
10.1002/adma.201103120
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发表时间：
2011-10-25
影响因子：
29.4
通讯作者：
Liu, Yunqi
中科院分区：
文献类型：
--
作者：
Guo, Yunlong;Wu, Bin;Liu, Yunqi
and chemical oxidation or exfoliation. [ 4 ] In the past few years, graphene materials have attracted considerable attention in many fi elds, including fl exible displays, solar cells, high-speed transistors, and sensitive sensors, due to their exceptional physical, chemical, electrical, mechanical, and biocompatible properties. [ 5 − 16 ] For example, graphene oxide (GO) is exceptionally suitable for use in chemical and biological sensors due to the nature of the atoms on its surface, scalable solution-based preparation process, and controllable surface defect density that modulates the sensor sensitivity and specifi city. [ 9 − 11 ] However, practical GO-based sensing applications are still limited, largely because of the diffi culties associated with controlling the surface oxidation state of GO and patterning/depositing GO thin fi lms on a substrate with the required device confi guration. Several methods of GO reduction have been developed, including high-temperature annealing of GO in vacuum or inert gases, chemical reduction of GO to reduced GO (RGO) in solution, and electrochemical reduction of GO. These methods are useful for reducing prepatterned or deposited GO, but in the case of GO in solution additional efforts are required to assemble the RGO. The electrochemical method is easy, “green”, and scalable, but a complicated buffer solution is needed. [ 15 ] In the case of the recently developed direct-current reduction of GO, the reduction mechanism is believed to be similar to that in the electrochemical method. The current electrochemical method has two disadvantages: a high voltage is needed to activate the reduction ( > 10 V), [ 16a ] and the reaction is strongly affected by the relative humidity of the ambient air. [ 16 ] If these two problems can be overcome, the electrochemical reduction method would be much more useful for the practical preparation of
