二胺
石墨烯
材料科学
氧化物
傅里叶变换红外光谱
化学工程
湿度
介电谱
乙二胺
高分子化学
分析化学(期刊)
电化学
纳米技术
无机化学
化学
有机化学
物理化学
电极
热力学
冶金
工程类
物理
作者
Pi-Guey Su,Zhang-Mao Lu
标识
DOI:10.1016/j.snb.2015.01.089
摘要
Novel impedance-type humidity sensors were made by coating diamine-functionalized graphene oxide (GO) films on alumina or plastic substrates. Ethylenediamine (EA) and 1,6-hexanediamine (HA) were used to functionalize GO using N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) (EDC/NHS) as the coupling reagent. The effects of the chain length of diamine on the electrical and humidity-sensing properties of the diamine-functionalized GO film were investigated. The diamine-functionalized GO film was characterized by atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). The impedance-type humidity sensor that was made of the EA-GO film exhibited a wide range of working humidities, a high sensitivity, satisfactory linearity, a small hysteresis, high flexibility, a short response/recovery time, a weak dependence on temperature and high long-term stability. The linearity of the humidity sensor depended on the applied frequency. The ions (H3O+) dominate the conductance of the diamine-functionalized GO film.
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