Au-In2O3 CO气体传感器的性能与机理研究

为了探讨氧化铟气体传感器的CO气敏性能和气敏机理,分别用化学沉淀法和浸渍法制备了未掺杂和金掺杂的氧化铟气敏材料,利用XRD和TEM对合成产物进行了表征.采用静态配气法测试了合成材料的气敏性能,利用气相色谱在线测试了CO在气敏材料表面的催化氧化产物,根据气敏性能与催化氧化结果研究了金掺杂氧化铟的气敏机理.实验结果表明:以2%质量比的金掺杂氧化铟对一氧化碳的反应有较高的灵敏度和选择性.根据金掺杂氧化铟对CO的催化氧化性能与气敏性能基本一致的结果,提出了金对氧化铟的CO增敏机理为化学增敏作用.

Studies on gas sensitive properties and mechanism of Au-In2O3 based CO gas sensor

In order to understand the gas sensing propeities and mechanism, Undoped and Au-doped Indium oxide were prepared by chemical precipitation and impregnation method, respectively. The crystal structure and microstructure of the samples were studied by XRD and TEM. The gas sensitivity was tested through Stationary state gas distribution method and catalytic oxidation of CO on indium oxide was measured by a GC-on line method. The gas sensitive mechanism of CO was suggested according to the results of gas sensing properties and catalytic oxidation of indium oxide to CO. The results show that 2%Au-doped Indium oxide is well sensitive to CO, and has good resolving power against H2. The role of Au in CO sensor is belonged to chemical sensitization.