固相合成CuFe_2O_4及其气敏性能  

GAS SENSITIVITY OF CuFe_2O_4 SYNTHESIZED BY SOLID STATE REACTION

作　　者：娄向东[1] 贾晓华[1] 徐甲强[2] 王芳[2] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007 [2]郑州轻工业学院材料与化工学院,郑州450002

出　　处：《硅酸盐学报》2006年第10期1199-1203,共5页Journal of The Chinese Ceramic Society

基　　金：河南省高校杰出科研人才创新工程(2003KYCX008);河南省杰出青年科学基金(03120000800)资助项目

摘　　要：以无机盐为原料,采用低热固相化学反应法合成了尖晶石型复合氧化物CuFe2O4的前驱体,通过不同温度煅烧,最后得到尖晶石复合氧化物CuFe2O4。用X射线衍射和透射电镜对合成产物进行了表征。结果表明:煅烧温度对尖晶石结构的形成有较明显的影响,当温度达到800℃时固相反应完全。合成材料的尺寸约为50nm,但由于铁酸盐有磁性而存在轻微团聚。将样品制成旁热式气敏元件,气敏测试结果表明:元件在较低的工作温度时,对H2S气体具有较高的灵敏度和选择性,对体积分数为25×10-6的H2S气体的灵敏度接近9.Spinel type complex oxide nano-crystalline CuFe2O4 powders were synthesized by solid state reaction using inorganic salts as raw materials. The structure was characterized by X-ray diffraction, and the crystal morphology and particle sizes were analyzed using transmission electron microscopy. The results indicate that sintering temperature has an apparent effect on the formation of the spinel structure, and the solid state reaction is complete at 800℃. The particle size of as-prepared sample is about 50 nm with a slight agglomeration because of its magnetism. Furthermore, the gas sensing properties of the materials were tested in static state. The results reveal that the sensors based on CuFe2O4 show high gas sensitivity and selectivity to H2S at low working temperature, the gas sensitivity can reach near 9 to H2S when its volume fraction is 25×10^-6.

关 键 词：铁酸铜 气体传感器 固相反应 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]