论文部分内容阅读
为了得出不同焙烧温度、工作温度及Pt负载条件下SnO2材料对H2的响应值与H2浓度间的定量关系。通过溶胶-凝胶法制备了SnO2纳米粉末,用丝网印刷制备以氧化铝陶瓷为基板的SnO2厚膜。分别用SEM、XRD及电化学工作站表征了SnO2的结构与形貌并测试了其气敏性能。结果表明,所制备的纯SnO2平均颗粒粒径约为60 nm,为四方相结构。焙烧温度越高,材料对H2的响应值越低,当焙烧温度为600~800℃时n值(响应值的对数与气体浓度的对数作图的斜率)不变;工作温度在200~400℃时,随着工作温度的升高n值降低;Pt负载SnO2与纯SnO2相比,Pt负载SnO2对H2的响应-恢复时间缩短,响应值提高,n值无明显变化。
In order to obtain the quantitative relationship between the response of H2O2 and H2 concentration at different calcination temperature, working temperature and Pt loading conditions. SnO2 nanopowder was prepared by sol-gel method and a SnO2 thick film with alumina ceramic substrate was prepared by screen printing. The structure and morphology of SnO2 were characterized by SEM, XRD and electrochemical workstation, respectively. The gas sensing properties were also tested. The results show that the average grain size of pure SnO2 prepared is about 60 nm and has a tetragonal phase structure. The higher the calcination temperature, the lower the response of the material to H2. When the calcination temperature is 600-800 ℃, the n value (the logarithm of the response value and the logarithm of the gas concentration) At 400 ℃, the value of n decreases with the increase of operating temperature. Compared with pure SnO2, Pt-loaded SnO2 has a shorter response time and a longer response time, but the value of n has no significant change.