采用微乳液法合成了纳米In2O3粉体,分别采用浸渍法和共沉淀法制备了掺杂Y2O3和Nd2O3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经600 ℃,1 h煅烧后,颗粒尺寸约20 nm,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,但选择性不好;氧化钕和氧化钇掺杂后,在3.0 V工作电压下大大提高了氧化铟对汽油的灵敏度和选择性,氧化钇掺杂量为5.0%时对汽油的最大灵敏度达到了285.1,功耗只有200 mW.
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