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

Huiling Tai,Yadong Jiang,Guangzhong Xie and Junsheng Yu 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

摘 要：Polyaniline （PANI）, polyaniline/titanium dioxide （PANI/TiO2）, polyaniline/tin oxide （PANI/SnO2） and polyani- line/indium oxide ℃（PANI/In2O3） thin films were developed by using an in-situ self-assembly method at ～10℃. 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 mi- croscopy （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.

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