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采用化学共沉淀法制得不同掺杂量的SnO2-WO3粉体,探讨了掺杂量、热处理温度、元件工作温度与WO3气敏性能的关系。研究发现:SnO2的添加抑制了WO3晶粒的生长,提高了其气体灵敏度。其中以0.5%(质量分数)的掺杂量为最佳,可进行H2S气体的选择性检测。
The SnO2-WO3 powders with different doping amount were prepared by chemical coprecipitation method. The relationship between the doping amount, the heat treatment temperature and the working temperature of the element and the gas sensing properties of WO3 was discussed. The results show that the addition of SnO2 suppresses the growth of WO3 grains and enhances the gas sensitivity. Among them, 0.5% (mass fraction) doping amount is the best, and H2S gas can be selectively detected.