Synthesis of hierarchical SnO2 nanoflowers and their high gas-sensing properties

Abstract The hierarchical SnO 2 flower-like nanostructure was successfully synthesized by a low-cost and simple hydrothermal method at 160 °C for 22 h. These uniform SnO 2 nanoflowers were composed of nanosheets. The polyvinyl pyrrolidone (PVP), sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O) and ammonia (NH 3 ·H 2 O) played a pivotal role in the growth of nanoflowers, and the possible formation mechanism was also proposed according to the results. Moreover, the gas sensor based on this structure showed a response about 160 and a response time around 12 s to 200 ppm acetone at the optimum operating temperature of 260 °C. It indicated that our sample has high response, fast response time and good selectivity to acetone. Thus, the peculiar structure of our sample endowed acetone detection with widely application prospects.

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