Abstract
• Flower-ball shaped Ag/Bi 2 WO 6 material was synthesized by hydrothermal method. • The gas sensing performance of Ag/Bi 2 WO 6 for ethanol was investigated for the first time. • Ag/Bi 2 WO 6 -based gas sensor has a fast response speed of up to 7s for ethanol. • The sensor based on Ag/Bi 2 WO 6 showed low operating temperature of 240℃ to ethanol. Although Bi 2 WO 6 has been applied in various field, there are few reports on the application of gas sensing. In this work, Ag loaded flower-ball shaped Bi 2 WO 6 composite nanomaterials were synthesised by hydrothermal method. The Ag content was optimized for the first time. It was found that when 2 % Ag was added, Ag/Bi 2 WO 6 material possessed high sensitivity and low optimal working temperature (240℃). Compared with pure Bi 2 WO 6 (11 s and 32 s), Ag/Bi 2 WO 6 possessed ultrashort response and recovery time of 7 s and 25 s. It exhibited better ethanol gas selectivity and stability. Unique crystal structure and Ag catalysis may lead to the improvement of gas sensing performance.
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