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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。
Nanometer In2O3 powder was synthesized by microemulsion method. Indium oxide doped with Y2O3 and Nd2O3 was prepared by impregnation method and coprecipitation method respectively. The structure and morphology of indium oxide were characterized by X-ray diffraction and transmission electron microscopy. The gas sensing properties of indium oxide were tested by static gas distribution method. The results show that the particle size of the indium oxide synthesized by microemulsion method after calcination at 600 ℃ for 1 h is about 20 nm and the distribution is uniform. Unadulterated indium oxide gas sensor has higher sensitivity to gasoline, but the selectivity is not good; neodymium oxide and yttrium oxide doped, at 3.0 V operating voltage greatly increased the sensitivity and selectivity of indium oxide on gasoline , Yttria doping amount of 5.0% maximum sensitivity to gasoline reached 285.1, power consumption is only 200 mW.