氧化铈掺杂对氧化铟气敏特性的影响  

Influence of Cerium Oxide Doping on the Gas Sensing Properties of Indium Oxide

作　　者：王焕新[1] 胡平[2] 王晓华[1] 徐甲强[1] 李超[1] 

机构地区：[1]郑州轻工业学院材料与化工学院,河南郑州450002 [2]郑州牧业工程高等专科学校基础课部,河南郑州450002

出　　处：《稀土》2007年第2期1-6,共6页Chinese Rare Earths

基　　金：国家自然科学基金项目资助(20471055);河南省杰出青年科学基金(03120000800)

摘　　要：用微乳液法合成了纳米In2O3粉体,浸渍法制备了掺杂CeO2的氧化铟。利用X射线衍射、透射电镜对氧化铟的结构和形貌进行了表征;采用静态配气法对氧化铟的气敏特性进行了测试。结果表明,微乳液法合成的氧化铟在600℃煅烧1h后,颗粒尺寸约20nm,且分布均匀。未掺杂的氧化铟气敏元件对汽油有较高的灵敏度,但选择性不是太好;氧化铈掺杂后,在加热电压为3.5V^4.5V范围内,较大地提高了汽油的灵敏度和选择性,尤其当加热电压为4.0V,掺杂量为5%(质量分数)时,灵敏度从9.0提高到40.4,汽油对丁烷的选择性系数为30.9,汽油对乙醇的选择性系数可达到11.5。The nanocrystalline indium oxide powder was prepared by microemulsion, CeO2 doped In2O3 were synthesized by impregnation. The structure and morphology were characterized by XRD and TEM, respectively. Gas sensing properties were tested at static state. The results showed that homogeneous indium oxide nanopowder with main grain size of 20 nm can be obtained from microemulsion after sintering at 600℃ for lb. Pure indium oxide gas sensor has higher sensitivity to gasoline than that to ethanol, butane,benzene,toluene,ammonia,and methanal, but selectivity was not as well as sensitivity. The sensors response to gasoline （Ra/Rg） was greatly promoted with doping CeO2 ,showing satisfying sensitivity and selectivity to gasoline at 3.5V-4.5V heating voltages, and the sensitivity to 50×10^-6 gasoline of the sensor doped with 5.0% CeO2 was found to reach a maximum of 40. 4 , the selectivity coefficient of gasoline to butane was 30. 9, and that to ethanol was 11.5.

关 键 词：纳米氧化铟 微乳液合成 气体传感器 稀土掺杂 汽油传感器 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] O614.372[自动化与计算机技术—控制科学与工程]