Abstract
Nanocrystalline BiFe0.6Mn0.4O3 powders were synthesized by sol–gel citrate method and studied for gas sensing behavior to reducing gases such as LPG, CO, CH4 and NH3. The composition and the structure of the powders have been investigated by means of XRD and TEM. The result shows that the BiFe0.6Mn0.4O3 powders have a rhombohedral distorted perovskite structure with an average crystallite size of 35–40 nm. The BiFe0.6Mn0.4O3-based LPG sensor shows better sensitivity at an operating temperature of 250 °C. The dispersion of Pd on BiFe0.6Mn0.4O3 in the ratio of 0.8 wt.% improved the sensitivity, selectivity and response time. In addition, it reduced the operating temperature from 250 to 210 °C for LPG sensor. The response time for LPG was less than 1 min.
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