摘要
在遵守热力学限制的前提下 ,以无机盐ZnSO4 ·7H2 O ,SnCl4 ·5H2 O ,NaOH为原料 ,在室温条件下 ,对反应物进行研磨 ,TG -DTA曲线表明 ,在研磨过程中 ,混合物发生反应生成ZnSn(OH) 6 ,60 0℃热处理 1h后得到钙钛矿型复合氧化物ZnSnO3,X射线粉末衍射 (XRD)、透射电镜 (TEM )等表征结果表明 ,产物为均相ZnSnO3,平均粒径约为 3 0nm左右 ;将样品制成烧结型气敏元件 ,对C2 H5OH有较高的灵敏度和选择性 ,工作温度为 2 40℃时 ,对酒精的灵敏度高达 19.7,响应 -恢复时间分别仅需 7s和 10s.
Complex oxide nanocrystalline powders ZnSnO 3 was synthesized with ZnSO 4·7H 2O, SnCl 4·5H 2O and NaOH by solid state reaction at room temperature. TG-DTA pattern shows that ZnSn(OH) 6 is formed during grinding. The results from XRD and TEM indicate that the final powders are ZnSnO 3 and the mean grain size of the powder is about 30 nm. The gas_sensing properties of the pure powders are studied. The results reveal that the gas sensors based on ZnSnO 3 have a high sensitivity and selectivity to ethanol. The sensitivity is 19.7 at 240 ℃ and the response and recovery times are 7 s and 10 s, respectively.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第3期321-324,共4页
Journal of The Chinese Ceramic Society
基金
河南省自然科学基金资助项目 (0 0 40 3 13 0 0 )
