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Room Temperature Ammonia Gas Sensor Based on Polyaniline-TiO$_{2}$ Nanocomposite

Room Temperature Ammonia Gas Sensor Based on Polyaniline-TiO$_{2}$ Nanocomposite,10.1109/JSEN.2011.2160392,IEEE Sensors Journal,S. G. Pawar,M. A. Chou

Room Temperature Ammonia Gas Sensor Based on Polyaniline-TiO$_{2}$ Nanocomposite  
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In the present work, we report on the performance of room temperature ammonia gas sensor based on polyaniline-ti- tanium dioxide (PANi-TiO ) nanocomposite. The nanocomposite was fabricated using the spin coating method on glass substrates. PANi-TiO (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 TiO , while polyaniline exhibited amorphous nature. Morphological analysis using scanning elec- tron microscopy of PANi-TiO nanocomposite film revealed uniform distribution of TiO nanoparticles in PANi matrix. The absorption peaks in FTIR and UV-Vis spectra of PANi-TiO composite 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 TiO particle and PANi molecular chains. The gas sensing properties showed the sensor exhibit selectivity to ammonia (NH ) at room temperature. Index Terms—Ammonia sensor, spin coating technique, PANi-TiO nanocomposite, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR).
Journal: IEEE Sensors Journal - IEEE SENS J , vol. 11, no. 12, pp. 3417-3423, 2011
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