This paper is focused on the comparative LPG sensing performances of bulk titanium dioxide and the synthesized TiO2 through hydrolysis of TiCl3 . The mean value sensitivity for different volume percentages (1-5%) of LPG has been estimated. Sensor response as a function of exposure time and response time has also been calculated. The average sensitivity and sensor response of the sensing element made of Titania synthesized through hydrolysis of TiCl3 are found to be maximum 3.0 and 318 respectively for 5 vol.% of LPG. Response time of the sensor was 70 sec. SEM images show that synthesized TiO2 is more porous than the obtained from Qualigens before exposure to the LPG. The minimum crystallites size of the purchased TiO2 and synthesized TiO2 are found to be 65 nm and 18 nm respectively. XRD patterns divulge that TiO2 is tetragonal and crystalline in nature. The device response was found to be concentration dependent, slow at low concentration and fast at higher concentrations.
Keywords: LPG Sensor;TiO2 ; SEM; XRD; Sensitivity.