Temperature dependence of gas sensing properties of Polyaniline and titanium dioxide (TiO2)/ Polyaniline composite based chemiresistor hydrogen gas sensor

S. Srivastava, S. Kumar, S.S. Sharma, V.K. Jain, V.K. Vijay
University of Rajasthan, Jaipur, IN

Keywords: TiO2/PANI composite, scanning electron microscopy (SEM), I-V measurement, temperature dependent gas sensing

Summary:

Recent advances in the development of nanostructured catalysts such as metal oxide nanoparticles, nanowires, nanorods, and nanobelts provide the opportunity to greatly increase the response of these materials, as sensor performance is directly related to granularity, porosity, and ratio of surface area to volume in the sensing element. The high temperature operation of these sensors make the lifetime of the sensor become shorter and Other problem associated with metal oxide thin film sensor is their poor performance regarding the sensitivity, stability and selectivity at certain low concentration of the gases in ambient conditions. In addition, the high operating temperature (200–400 ◦C) of these sensors may be inadequate for measuring high H2 concentrations due to the danger of explosions. Therefore the combination of conducting polymer (PANI) and TiO2 due to their unique properties presents a fascinating structure, which has shown promising application in field of hydrogen gas sensor at room temperature. In the present work we have reported the effect of temperature on the gas sensing properties of pure Polyaniline (PANI) and titanium dioxide (TiO2) doped PANI composite thin film based chemiresistor type gas sensors for hydrogen gas sensing application.