Humidity sensors based on TiO2 nanoparticles/polypyrrole composite thin films

被引：185
作者：
Su, Pi-Guey [1 ]
Huang, Lin-Nan [1 ]
机构：
[1] Chinese Culture Univ, Dept Chem, Taipei 111, Taiwan
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2007年 / 123卷 / 01期
关键词：
humidity sensor; in situ photopolymerization; composite film; PPy; TiO(2)NPs; sensing mechanism;
D O I：
10.1016/j.snb.2006.09.052
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Resistive-type humidity sensors were fabricated through in situ photopolymerization of pure polypyrrole (PPy) and TiO2 nanoparticles/polypyrrole (TiO2 NPs/PPy) composite thin films on an alumina substrate. The characterizations of the thin films were analysed by scanning electron microscopy (SEM) coupled with an energy dispersive spectrometer (EDS) and Fourier transform infrared spectroscopy (FTIR). The electronic properties of PPy and TiO2 NPs/PPy composite thin films were investigated based on the components AgNO3 and TiO2 used as electron acceptor and photoinitiator, respectively. The humidity sensing mechanism of TiO2 NPs/PPy composite thin films was investigated via the results of activation energy and impedance spectroscopy. The sensor made of TiO2 NPs/PPy composite thin films, using the added amount of TiO2 NPs as 0.0012g showed the highest sensitivity, smaller hysteresis and best linearity. Moreover, other sensing properties, such as effects of applied frequency, ambient temperature, response and recovery time and long-term stability were also investigated. (c) 2006 Elsevier B.V. All rights reserved.
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收藏
页码：501 / 507
页数：7
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