Abstract
Abstract Hierarchical SnO2 aerogels have attracted a wide interest for their semiconductivity. In this work, we synthesized the MoO3-mixed SnO2 aerogels via facile ambient pressure drying (APD). Simultaneously, the ethanol-sensitive property of MoO3-mixed SnO2 aerogels was studied, expected to explore their possible electrochemical applications in the future. Particularly, after the MoO3-mixed SnO2 aerogel was calcined in nitrogen, it showed a high response value (Ra/Rg) of 714 to 100 ppm ethanol at 260 °C. Besides, it also had characteristics of low response concentration, rapid response time and unique selectivity to ethanol. Combined with the analysis of various techniques, the mechanisms for gas-sensitivity have been discussed. The results demonstrate why MoO3-mixed SnO2 aerogel calcined in nitrogen has excellent gas-sensitivity to ethanol can be ascribed to its additional depletion layer and favorable hierarchical structure.
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