凝胶网格法制备纳米CdFe_2O_4粉体及其对CH_3SH的气敏性  

Gas Sensitivity of CdFe_2O_4 Synthesized by Gel-gridding Method for CH_3SH

作　　者：王丽斐[1] 王换荣[1] 陆维昌[1] 陈邦林[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《化学世界》2008年第2期65-67,78,81,共5页Chemical World

摘　　要：以无机盐为原料,采用凝胶网格法合成了尖晶石型复合氧化物CdFe2O4的前驱体,并在700°C热处理后得到了纳米尺寸CdFe2O4粉体,利用XRD和TEM对粉体的形貌、结构进行了表征。研究表明,用凝胶网格法制备的CdFe2O4结晶良好,粒度分布均匀,平均粒径为21.3 nm。以CdFe2O4纳米粉体为原料制备了厚膜型气敏元件。CdFe2O4是电子导电型半导体,当加热电压为6.5 V时,该元件对甲硫醇具有较高的灵敏度,较好的稳定性和选择性。Nanocrystalline spinel-type complex oxide CdFe2O4 was synthesized by calcining oxide obtained from gel-gridding method with inorganic reagents at 700（℃）.The results of XRD and TEM indicate that the mean grain size of the powder is about 21.3 nm.The gas-sensing properties of the pure powders were studied.The sensors based on CdFe2O4 show high sensitivity and selectivity to CH3SH at a heating voltage of 6.5 V.

关 键 词：铁酸镉纳米粉体 凝胶网格法 气敏性能 甲硫醇 

分 类 号：O614.24[理学—无机化学] TP212.2[理学—化学]