【摘要】 以氧化锡为基体材料的气敏元件,在500～900℃下烧结,元件对一氧化碳的灵敏度、元件电阻等都有很大影响。经X-射线光电能谱分析表明:掺有不同添加荆的氧化锡中Sn-3d电子的结合能比纯二氧化锡中相应的值低0.40eV,产生了更多的氧空位,烧结温度的高低对氧空位的浓度也有影响。由于Sn-3d电子结合能的变化,导致材料表面能带弯曲,从而影响元件的电阻。分析表明;氧化锡气敏材科中氧空位浓度对元件的气敏特性会产生重要的影响。更多还原

【Abstract】 Using tin oxide as host material, doped with platinum, antimony and other element compounds, by many preparation methods, a new kind of carbon monoxide gas sensor was manufactured, which can measure dilute concentration of carbon monoxide at low temperature even at room temperature. The sensor can measure carbon monoxide gas concentration from hydrogen, methane, butane and city coal gas selectively, its electrical resistance in environment of the best gas-air mixture was almost independent of environment temperature from-20℃ to 40℃ and of the humidity from 40％ RH to 93％ RH in the presense of 100ppm carbon monoxide gas, the sensor can be used in various places where carbon monoxide should be measured to refrain from various disasters action or make full use of fuel. The composition, structure and properties of the gas sensing material were studied with X-Ray Photoelectron Spectroscopy （XPS）, X-Ray Diffraction （XRD）. Electron Probe （EP）, Infrared Spectroscopy （IR）, Differential Thermal Analsis （DTA）, and Sweep Electron microscope （SEM）, it was found that antimony and some other additivies make tin oxide deviate further from stoichiometrical compound SnO₂. The gas sensing mechanism and the reason why the sensor can measure carbon monoxide selectively were discussed.更多还原