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． The ultrafine powder In2O3 with the purity of 99.998% is doped with metal oxide such as PtO2, MgO, CaO and the like in a suitable ratio to form a gas-sensitive material, a Pt wire is used as a heat-sensitive material, a hot-wire type component manufacturing process is adopted, Sintering 1 h, can produce ethanol gas sensor. The test shows that the device has high sensitivity, fast response recovery, low power consumption (≤200 mW) and good selectivity for gas, smoke and other interference gases.