Highly sensitive humidity sensor at low humidity based on the quaternized polypyrrole composite film

被引：90
|
作者：
Sun, Aihua [1 ]
Li, Zhixiang [1 ]
Wei, Tiefeng [1 ]
Li, Yong [1 ]
Cui, Ping [1 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Dept Funct Mat & Nanodevices, Ningbo 315201, Zhejiang, Peoples R China
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 142卷 / 01期
关键词：
Humidity sensor; Polypyrrole; Composite; Chemical polymerization; SENSING BEHAVIORS; TIO2; GAS; CANDIDATE;
D O I：
10.1016/j.snb.2009.08.028
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Polypyrrole composite was fabricated by using chemical polymerization at room temperature, which was further quaternized with 1,4-bromobutane to prepare the humidity sensitive material. The electrical properties of the sensor were measured. The results showed that the quaternized polypyrrole composite film exhibited low impedance at very low humidity; the impedance value was about 780 k Omega at 11% RH and the impedance changed from 10(6) to 10(3) Omega between 11% and 95% RH, which was suitable for detection of low humidity. Moreover, the logarithm of impedance of the polypyrrole composite film varied linearly (R-2 = 0.9916) with relative humidity in the range of 11-95% RH. Surface and cross-sectional morphology of the films, response-recovery time and hysteresis were also measured and estimated. The sensing mechanism of the sensor was also investigated. Crown Copyright (C) 2009 Published by Elsevier B. V. All rights reserved.
引用
收藏
页码：197 / 203
页数：7
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