Gas sensor preparation based on WO-BiWO and optimized mechanism of enhanced gas-sensing performance for triethylamine gas

Triethylamine is a common toxic and harmful gas in industries and corrupt food, which is harmful to the human body and environment, so it is necessary to detect triethylamine gas. BiWO and WO are widely used in gas sensing due to their excellent physical and chemical properties. Herein, BiWO, WO, and WO-BiWO are successfully synthesized by a one-step hydrothermal method. Several characterizations are used to analyze the crystal structures, morphologies, chemical compositions, and optical and electrochemical properties of the as-prepared samples. Meanwhile, the optimum working temperatures, selectivity characteristics, response and recovery times,stability characteristics, and humidity resistances of the gas-sensing materials are investigated comprehensively. The results show that 0.5 WO-BiWO exhibits high gas response (33.0), fast response and recovery times (12 s/ 36 s), excellent stability, and unique selectivity toward 30 ppmtriethylamine at 300°C. Additionally, the enhanced gas-sensing mechanism of 0.5 WO-BiWO is proposed, which provides a feasible strategy for optimizing the gas-sensing performance of 0.5 WO-BiWO