超细铁酸镉材料的制备及其气敏性能研究  

CdFe_2O_4 Semiconductors: Preparation and Gas Sensing Property

作　　者：杨留方[1,2] 赵鹤云[1] 唐启祥[1] 项金钟[1] 吴兴惠[1] 

机构地区：[1]云南大学佐波传感技术研究中心 [2]玉溪师范学院物理系,云南玉溪653100

出　　处：《电子元件与材料》2004年第3期23-25,共3页Electronic Components And Materials

基　　金：云南省自然科学基金重点课题(2001E0003Z)

摘　　要：以FeSO4·7H2O和CdCl2·2.5H2O为原料,采用化学共沉淀法制备了纳米尺寸CdFe2O4粉体。利用X射线衍射仪、透射电镜对粉体的形貌、结构进行了表征。研究表明,用化学共沉淀法制备的CdFe2O4结晶情况良好,分布均匀,平均粒径约为80 nm。以CdFe2O4纳米粉体为原料制备了厚膜气敏元件,在工作温度为400左右时,该元件对乙醇具有较高的灵敏度、好的稳定性和选择性。并对气敏机理给予了解释。Nano-sized CdFe2O4 powders were prepared by chemical co-precipitation with FeSO4·7H2O and CdCl2·2.5H2O. The microstructure was investigated by XRD and TEM. The results show that the mean grain size of the powders is about 80 nm and the dispersity good. The gas sensing property of CdFe2O4 powders was studied. The investigation demonstrates that the sensors based on CdFe2O4 powders has higher sensitivity and better stability and higher selectivity to C2H5OH at 400℃. The gas sensing mechanism is discussed.

关 键 词：铁酸镉纳米粉体 化学共沉淀 气敏性能 乙醇 

分 类 号：TN304[电子电信—物理电子学]