J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (7): 605-613.

• Thin Film and Coatings • Previous Articles     Next Articles

Preparation, Characterization and Comparative NH3-sensing Characteristic Studies of PANI/inorganic Oxides Nanocomposite Thin Films

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  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu 610054, China
  • Received:2008-07-01 Revised:2009-07-19 Online:2010-07-31 Published:2010-07-26
  • Supported by:

    the National Natural Science Foundation of China under grant Nos. 60425101 and 60736005

Abstract:

Polyaniline (PANI), polyaniline/titanium dioxide (PANI/TiO2), polyaniline/tin oxide (PANI/SnO2) and polyaniline/indium oxide (PANI/In2O3) thin films were developed by using an in-situ self-assembly method at -10°C. Chemical structure, optical property and morphology of all the thin films were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-Vis absorption spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). NH3 gas-sensing properties of PANI and PANI nanocomposite thin films were examined at ambient temperature. The results showed that all the sensors composed of PANI nanocomposite thin films had faster response/recovery rate with better reproducibility, selectivity and long-term stability to NH3 than PANI thin film sensor, and PANI/TiO2 nanocomposite thin film sensor showed optimum NH3 gas-sensing characteristics. The effect of humidity on the responses of all the sensors was also investigated.

Key words: PANI/TiO2, PANI/SnO2, PANI/In2O3, Thin films, NH3

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