热解法制备纳米SnO_2及气敏性能  

Nanocrystalline SnO_2 Gas Sensors Obtained from Pyrolysis and Their Sensitivities

作　　者：石娟[1] 吴世华[2] 王淑荣[2] 李鹏[2] 

机构地区：[1]天津工业大学材料化工学院,天津300160 [2]南开大学化学系金属及分子基材料化学天津市重点实验室

出　　处：《应用化学》2006年第12期1396-1400,共5页Chinese Journal of Applied Chemistry

摘　　要：在不同温度下热解SnC2O4制备出纳米SnO2。利用XRD、红外光谱测试技术研究了SnO2的形貌、结构及晶粒生长过程,对它们的气敏性能进行了研究。结果表明,随着热解温度的不同,获得的颗粒尺寸不同。机理研究显示:650℃以上或650℃以下SnO2颗粒生长的方式不同。当热处理温度<650℃时,晶核生长以表面扩散为主,晶粒生长缓慢;在650℃以上热解时,晶粒以晶界迁移进行粒子生长,生长比较迅速。热解温度对气敏灵敏度影响很大,对响应恢复时间影响不大。热解法合成的SnO2纳米材料具有较好的酒敏性能,650℃热处理所得样品的气敏性能最佳,在灵敏度、响应恢复时间上表现优良。Nanosized gas sensing material SnO2 was synthesized through pyrolysis of an oxalate precursor at different temperatures. The SnO2 samples were characterized by means of XRD, IR and gas sensing testing. The results reveal that at different pyrolysis temperatures, the SnO2 particles obtained show different grain sizes. The results indicate that the mechanism for SnO2 crystal growth was different when the pyrolysis temperature was below or above 650 ℃. The grain size of SnO2 increased slowly with pyrolysis temperature up to 650 ℃ , where surface diffusion was dominant, while at above 650 ℃ , grains began to grow via crystal boundary migration, and grew rapidly. Sensitivity of nanosized gas sensing material SnO2 is greatly affected by pyrolyzing temperature, while response and recovery time is relatively stable. SnO2 obtained at 650 ℃ exhibits the best sensitive properties.

关 键 词：氧化锡 晶粒生长 气敏性 

分 类 号：O611.6[理学—无机化学] O614.4[理学—化学]