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Citation: WANG Rui, ZHANG Tong, HE Yuan, GENG Wang-Chang, NIU Li-Gang, LI Xiao-Tian. Complex Impedance Analysis of the Humidity Sensing Properties of Polypyrrole[J]. Acta Physico-Chimica Sinica, ;2009, 25(02): 327-330. doi: 10.3866/PKU.WHXB20090222 shu

Complex Impedance Analysis of the Humidity Sensing Properties of Polypyrrole

1.
State Key Laboratory on Integrated Optoelectronics Jilin University Region, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China; College of Materials Science and Engineering, Jilin University, Changchun 130012, P. R. China

Received Date: 12 September 2008
Available Online: 24 November 2008

Polypyrrole was obtained by chemical synthesis. The extension of polymerization time to 96 h produced a polypyrrole that was suitable for absorbing moisture. The structure and morphology of polypyrrole were characterized by infrared (IR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Properties of this humidity sensor were investigated and complex impedance plots were obtained from 20 Hz to 100 kHz. The sensing mechanism was discussed based on test results. Using complex impedance analysis we studied the working principle of the humidity sensor and confirmed the identity of the conductive particles.
- Polypyrrole; Humidity sensor; Complex impedance
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