【摘要】 在纯度为99.998%的超微细粉体In2O3中，掺入适当配比的PtO２，MgO，CaO 等金属氧化物构成气敏材料，用Pt丝作热敏材料，采用热线型元件制作工艺，700 ℃烧结1 h，可制作出乙醇气敏元件．测试表明：该元件灵敏度高，响应恢复快，功耗低(≤200 mW) ，对汽油、烟雾等其他干扰气体有良好的选择性．更多还原

【Abstract】 The gas sensor materials are obtained through doping 4%~10% PtO２, MgO and C aO etc. into the N type semiconductor material of ultra tiny powder In2O3 wi th the degree of purity is 99.998%. Hotwire-type fabricating is made at the opt imum 700 ℃ temperature with Pt wire as the heating sensor materials. The result s show that the sensor has the characteristics of high alcohol sensitivity, shor t initial stable time, short resuming time, low power dissipation(≤200 mW)，the most prominent selectivity, low sensitivity to disturbing gases such as petrol and smoke.更多还原