二氧化锡气敏基材的制备方法

Study on the Preparation Method of gas Sensitive Material Based on Tin Dioxide

对四氯化锡加氨水中和制备二氧化锡气敏材料的方法进行了考察。二氧化锡经５００℃灼烧３ｈ，再于３００℃下老化，其ＸＲＤ谱图与７００℃的烧所得二氧化锡的ＸＲＤ谱图基本相同，但其比表面比后者大１０ｍ２／ｇ，两者比表面之比为０．６９；而在２５０℃下两种材料在清洁空气中的稳定电阻值（Ｒ０）之比为０．６６；在５００×１０－６（体积比）乙醇气中的稳定电阻值（Ｒｇ）之比为０．６８５．前者对乙醇气的灵敏度稍优于后者。更适于用作气体传感器的基材。

s The preparation method of gas sensitive material SnO2 obtained by adding ammonia water to SnCl4 aqueous solution is studied. The XRD spectrum of the SnO2 which is calcined for 2 hours at 500℃ and then aged at 300℃, is similar to that of the SnO2 which is calcined at 700℃, but the special surface of the former is 10m2 / g more than the latter, the proportion of the former to the latter is 0.69. According to this, the R0 ratio of the two is 0.66. (R0 is the stable rsistance in clean air at 250℃ ) and the Rg ratio of the two is 0.665(Rg is the Stable resistance in ethanol-air (of 500 x 10 -6 vol. ratio) at 250℃). The sensitivity of the former to ethanol vapor is a little better than the that of latter, and the formler is slightly suitable for gas sensitive material.