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    Influence of polymerization temperature on NH3 response of PANI/TiO2 thin film gas sensor

    Year: 2008

    Journal: Sensors and Actuators B: Chemical, Volume 129, Issue 1, 29 January 2008, Pages 319-326, 20111221

    Authors: Huiling Tai, Yadong Jiang Guangzhong Xie, Junsheng Yu, Xuan Chen and Zhihua Ying

    Organizations: 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, PR China

    Polyaniline/titanium dioxide (PANI/TiO2) nanocomposite thin films were processed on a silicon substrate with gold interdigital electrodes by an in-situ self-assembly approach for NH3 gas-sensing application, and the effect of polymerization temperature on the gas response of the PANI/TiO2 thin film gas sensor was investigated. The results showed that the PANI/TiO2 thin film prepared at 10 °C was superior to those prepared at other temperatures in terms of response properties, which also exhibited good reproducibility, selectivity and long-term stability. UV–vis absorption and surface morphology characterization of the nanocomposite thin films were performed to explain these different gas-sensing properties. The sensing mechanism was also discussed.