TiO_2-PANI nanocomposite thin film prepared by spin coating technique working as room temperature CO_2 gas sensing

摘要

Present work reports the performance of a semiconducting PANI doped TiO_2 nanocomposite thin film and its application in CO_2 sensing. The TiO_2-PANI nanocomposite layer was deposited on a simplified test device. Optical properties were investigated using UV-Vis absorption spectroscopy. The surface morphology and structure of synthesized material were characterized by TEM and XRD analysis, respectively. The structural analysis confirmed the formation of TiO_2-PANI having an average crystallite size 7 nm. Variations in resistance with the exposure of CO_2 to the sensing element were observed. Sensor response (S) as a function of time was calculated and its maximum value was found as 53 for 1000 ppm of CO_2. Response and recovery times of the sensor were observed as 9.2 and 5.7 min respectively. Sensor was found reproducible.