In the present work, we report on the performance of room temperature ammonia gas sensor based on polyaniline-titanium dioxide (PANi-TiO2) nanocomposite. The nanocomposite was fabricated using the spin coating method on glass substrates. PANi-TiO2(0%-50%) nanocomposite films were characterized for their structural as well as surface morphologies, UV-Vis and various gas responses were studied. The XRD analysis showed formation of nanocrystalline TiO2, while polyaniline exhibited amorphous nature. Morphological analysis using scanning electron microscopy of PANi-TiO2nanocomposite film revealed uniform distribution of TiO2nanoparticles in PANi matrix. The absorption peaks in FTIR and UV-Vis spectra of PANi-TiO2composite film were found to shift to a higher wave number as compared to those observed in pure PANi. The observed shifts were attributed to the interaction between the TiO2particle and PANi molecular chains. The gas sensing properties showed the sensor exhibit selectivity to ammonia (NH3) at room temperature.
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Pawar et al. (2011) studied this question.
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