CeO_2/SnO_2纳米材料的制备与气敏性能研究  

Preparation and gas-sensitivity of CeO_2/SnO_2 nanostructured materials

作　　者：刘元隆[1] 吴建刚[1] 吴小琴[1] 舒红英[1] 陈德志[1] 

机构地区：[1]南昌航空大学环境与化学工程学院,江西南昌330063

出　　处：《化学研究与应用》2008年第1期26-29,共4页Chemical Research and Application

基　　金：江西省自然科学基金资助项目(0520070)

摘　　要：本文应用溶胶-凝胶法制备了7种不同成分和煅烧温度的CeO2／SnO2材料，应用X射线衍射方法对其中的3种进行了结构表征和粒度分析，运用自组装的气敏性能设备检测了该7种不同成分的CeO2／SnO2材料的气敏性能，简要分析了其气敏机理。结果表明：掺杂CeO2有利于SnO2晶粒的细化；掺杂CeO2和La2O3可改变或提高SnO2气敏材料对某些气体的气敏性能；煅烧温度在600℃～800℃之间，掺杂2％CeO2的CeO2／SnO2气敏材料，随煅烧温度上升，气敏性能下降；煅烧温度600℃、掺杂5％CeO2的CeO2／SnO2气敏材料，对乙醇具有较高的灵敏度和选择性，具有开发应用价值；CeO2／SnO2气敏材料的气敏机理为表面电导控制型。Seven CeO2/SnO2 gas-sensitive materials were prepared by sol-gel. The phase structure and nanostructure of three of them were determined by means of X-ray diffraction （XRD）. The influences of component and calcination temperatures on the CeO2/SnO2 gas sensitivity were studied too. The gas sensing mechanism was simply analyzed. The results show that the crystalline grain size of the SnO2 turn fine by doped CeO2 ; the gas sensitivity of SnO2 to some gas is changed or enhanced by doped CeO2 or La2 03; the gas sensitivity of the CeO2/ SnO2 （2 wt. % CeO2 ） decrease with the sintering temperature （600-800℃ ） increasing, and the CeO2/SNO2（5 wt. % CeO2, sintering temperature 600℃） has higher sensitive and selective to CEHsOH; and the gas sensing mechanism of the CeO2/SnO2 is the model of electric conductivity by surface control.

关 键 词：气敏性能 纳米材料 SNO2 CEO2 溶胶-凝胶法 

分 类 号：TQ134[化学工程—无机化工] O612.4[理学—无机化学]