采用化学沉淀法制备了xwt％SiO2-WO3(x=0,3,5,10,15)粉体材料,利用X射线衍射仪、透射电镜等测试手段分析了材料的微观结构,探讨了掺杂量、元件工作温度与WO3气敏性能的关系。研究发现:SiO2的掺杂提高了WO3粉体材料对H2S气体的灵敏度,其中掺杂量为5％的烧结型气敏元件在180℃下对H2S气体有较高的灵敏度和选择性;本文还对WO3的H2S气敏机理进行了探讨。
The powders of xwt%SiO2-WO3 were prepared by the chemical precipitation method, and their microstructures were characterized through XRD and TEM. The effects of SiO2 content and sensors operating temperature on the sensitivity were investigated. The mechanism of gas sensitivity of WO3 to H2S was also discussed. The results show that the sensitivity to H2S rises when SiO2 added. The sensor has high sensitivity and good selectivity to H2S when x=5 and the optimum working temperature is 180℃.
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