新型α-Fe_2O_3-SnO_2气敏元件的研制

THE DEVELOPMENT OF A NEW TYPE OF GAS SENSOR USING α-Fe_2O_3-SnO_2

采用混合盐溶液共沉淀法,我们配制出残存SO_4^(2-)的α-Fe_2O_3-SnO_2气敏材料,通过控制和改善材料的微观构造,提高了不添加资金属催化剂的α-Fe_2O_3的气敏活性。研制出旁热式气敏元件、测试了静态特性。该元件具有成本低、功耗低、输出线性好,不易受乙醇干扰及机械强度高特点。

Through coprecipitation of mixed saline solution, we prepared the gas sensing material of SO42-/a-Fe2O3-SnO2. The activity of a-Fe2O3 without any noble metal catalyst was enhanced by controlling its microstructure. We developed a beside-heated type of gas sensor, and measured its static gas sensitive properties. This gas sensor has several typal features, such as high sensitivity to city coal gas, ideal linearity, low cost and wasted power, excellent selectivity against ethanol and high mechanical strength.