Electrical and humidity-sensing properties of reduced graphene oxide thin film fabricated by layer-by-layer with covalent anchoring on flexible substrate

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题名:	Electrical and humidity-sensing properties of reduced graphene oxide thin film fabricated by layer-by-layer with covalent anchoring on flexible substrate
作者:	Su, Pi-Guey Chiou, Chuang-Fu
贡献者:	化學系
关键词:	Flexible humidity sensor Graphene oxide Partially reduced GO Covalently bonding Water resistance
日期:	2014-09
上传时间:	2015-01-21 13:53:03 (UTC+8)
摘要:	Novel flexible humidity sensors were fabricated layer-by-layer (LBL) by covalently bonding graphene oxide (GO) to a gold electrode on a plastic substrate using a peptide chemical protocol, and then partially reducing in-situ the GO film. The effects of the duration of reduction of the GO film on the electrical and humidity-sensing properties of the reduced GO film were investigated. The anchored partially reduced GO film was characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). This flexible impedance-type humidity sensor exhibited a strong water resistance, a wide range of working humidities, a high sensitivity, an acceptable linearity, a small hysteresis, high flexibility, a short response/recovery time, a weak dependence on temperature and high long-term stability. The flexible humidity sensor's linearity depended on the applied frequency. The complex impedance plots that were obtained at low and high relative humidities revealed that the ions (H3O+) dominate the conductance of the anchored partially reduced GO film. (C) 2014 Elsevier B.V. All rights reserved.
關聯:	SENSORS AND ACTUATORS B-CHEMICAL 卷: 200 頁碼: 9-18
显示于类别:	[化學系所] 期刊論文

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