Abstract
The spinel oxides are identified as the highly promising materials for gas sensing application due to their good thermal stability, low cost and nice sensitivity. The spinel oxide nanocomposites of Co3O4/SnO2 and Co2SnO4/SnO2 were prepared by the co-precipitation method, and their gas sensing characteristics were investigated in this work. Compared with the Co3O4/SnO2 nanocomposites, the sensor based on Co2SnO4/SnO2 nanocomposites exhibited significantly enhanced response and selectivity performance toward triethylamine (TEA). The response of the Co2SnO4/SnO2 composites is about 45.9 to 100 ppm TEA at 270 °C, which was almost 4 times higher than that of Co3O4/SnO2 nanocomposites. The excellent performance of the Co2SnO4/SnO2 composites can be attributed to the catalytic ability of divalent Co2+ cation located in octahedral sites in spinel structure, which results in enhanced gas absorption and catalytic performance.
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