Abstract

The Au-decorated SnO2 nanoflowers (NFs) composites were synthesized via a facile impregnation route by using chloroauric acid and SnO2 powder as precursors without any templates. The gas sensing performance of the as-synthesized samples based gas sensors to methane (CH4) were systematically investigated. The results indicate that the response of the 1.5 wt% Au-decorated SnO2 based gas sensor to 500 ppm CH4 at the lower optimum operating temperature (120 °C) is approximately six times higher than that of pristine SnO2. In addition, which also provide higher selectivity, good repeatability and stability. The excellent gas sensing properties are mainly attributed to the NFs structure and the catalytic and spillover effects of Au.

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