Au-In_2O_3CO气体传感器的性能与机理研究  

Studies on Gas Sensitive Properties and Mechanism of Au-In_2O_3 Based CO Gas Sensor

作　　者：徐甲强[1] 韩建军[1] 谢冰[1] 刘云[1] 

机构地区：[1]郑州轻工业学院材料与化工学院

出　　处：《传感技术学报》2007年第3期481-484,共4页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金资助"金属氧化物一维纳米材料的合成与气敏特性研究"(20471055);河南省杰出青年科学基金资助"氧化铟纳米材料的合成与气敏特性研究"(03120000800)

摘　　要：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.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.

关 键 词：一氧化碳传感器 气敏机理 选择性 催化氧化 氧化铟 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]