WO_(3)-Bi_(2)WO_(6)基气体传感器的构建及其对三乙胺气敏性能优化的作用机理

Gas sensor preparation based on WO_(3)-Bi_(2)WO_(6) and optimized mechanism of enhanced gas-sensing performance for triethylamine gas

三乙胺气体是工业中和腐败食品中常见的有毒有害气体,对人体和环境危害较大,因此对三乙胺气体的检测十分有必要.Bi_(2)WO_(6)和WO_(3)由于其优秀的物理和化学特性,被广泛用于气体传感领域.本文通过水热法制备了Bi_(2)WO_(6),WO_(3)和WO_(3)-Bi_(2)WO_(6)气敏材料,采用一系列表征方法,对所制备样品的晶体结构、元素组成、形貌、光学和电化学性质进行了分析,并对气敏材料的最佳工作温度、选择性、响应恢复时间、稳定性及抗湿能力进行了全面的研究.结果表明,0.5 WO_(3)-Bi_(2)WO_(6)样品在300℃下对30 ppm三乙胺气体表现出最高的灵敏度(33.0),较短的响应恢复时间(12 s/36 s),同时也表现出良好的稳定性和选择性.根据以上分析,提出了0.5 WO_(3)-Bi_(2)WO_(6)的气敏性能增强机理,为WO_(3)-Bi_(2)WO_(6)气敏性能的优化提供了一种可行的策略.

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.Bi_(2)WO_(6) and WO_(3) are widely used in gas sensing due to their excellent physical and chemical properties.Herein,Bi_(2)WO_(6),WO_(3),and WO_(3)-Bi_(2)WO_(6) 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_(3)-Bi_(2)WO_(6) 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℃.Additionally,the enhanced gas-sensing mechanism of 0.5 WO_(3)-Bi_2WO_(6) is proposed,which provides a feasible strategy for optimizing the gas-sensing performance of 0.5 WO_(3)-Bi_(2)WO_(6).