Abstract
The present investigation deals with the fabrication of liquid petroleum gas (LPG) sensor based on semiconducting oxide SnO 2. The gas sensor elements have been prepared by conventional solid state route. Addition of noble metal sensitizer, palladium and grain growth inhibitor, aluminum silicate to the base material SnO 2, not only improved the sensitivity towards LPG but also the selectivity in the presence of CO and CH 4 gases. Out of various sensor compositions, SnO 2 : Al 2Si 2O 7 (35 wt.%) : Pd (1.5 wt.%) sintered at 800°C for 5 h has shown high sensitivity (0.97) towards LPG at an operating temperature of 350°C. Different characterization techniques have been employed, such as differential thermal analysis (DTA), surface area analyzer, X-ray diffraction (XRD), to study the formation of SnO 2, surface area and crystallite size, respectively. The results suggested the possibility of utilizing the sensor element for the detection of LPG.
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