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- Title
Directâcurrent and alternatingâcurrent analysis of the humidityâsensing properties of nickel oxide doped polypyrrole encapsulated in mesoporous silica SBAâ15.
- Authors
Rui Wang; Tong Zhang; Yuan He; Xiaotian Li; Wangchang Geng; Jinchun Tu; Qing Yuan
- Abstract
Nickel oxide (NiO) doped polypyrrole (PPy) was encapsulated in mesoporous SBAâ15. All of the synthesized samples were characterized by infrared spectroscopy, Xâray diffraction, and scanning electron microscopy. They were investigated as humidityâsensor materials at room temperature. The sensor showed excellent humidity sensitivity in the relative humidity range 11â95%. The humidityâsensing properties were very much improved by encapsulation of the NiOâdoped PPy into mesoporous silica SBAâ15. Finally, the sensitivity mechanism was investigated by directâcurrent (dc) and alternatingâcurrent (ac) analysis. The dc circuit with the instantaneous polarity reversion method was designed by us to study the dc response in different humidity environments. The conductive mechanism was established through the dc and ac investigation, and the conductive particles were identified as ions and electrons. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
- Subjects
OXIDES; INFRARED spectroscopy; X-ray diffraction; SCANNING electron microscopy; HUMIDITY
- Publication
Journal of Applied Polymer Science, 2010, Vol 115, Issue 6, p3474
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.31408