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.
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