纳米级La_(1-x)Ba_xCoO_3半导体陶瓷的制备与湿敏性能  

Preparation and Humidity-sensitive Properties of Nanometer-sized Semiconductor Ceramics La_(1-x)Ba_xCoO_3

作　　者：陈秀芳[1] 莫茂松[2] 王银海[3] 刘艳美[3] 

机构地区：[1]安徽纺织职业技术学院纺织科,安徽合肥230051 [2]中国科技大学化学系,安徽合肥230026 [3]安徽大学物理系,安徽合肥230039

出　　处：《无锡轻工大学学报（食品与生物技术）》2001年第3期261-264,共4页Journal of Wuxi University of Light Industry

基　　金：国家自然科学基金!项目 (2 982 5 10 5 )资助课题

摘　　要：采用Sol gel法化学工艺在较低温度下合成纳米级La1 xBaxCoO3(X =0 ,0 .1≤X≤ 0 .2 )湿敏半导体陶瓷 .用XRD、BET比表面吸附、Archimede排水法等技术对所合成陶瓷物相和结构进行了表征和分析 .湿敏特性测试结果表明 ,La1 xBaxCoO3半导体纳米陶瓷有一定的湿敏性能 ,当X =0 ,材料呈负湿 阻特性 ,当 0 .1≤X≤ 0 .2 ,材料呈正湿 阻特性 .从晶界层空穴载流子数角度合理解释了La1 xBaxCoO3纳米陶瓷的正湿Nanometer sized composite oxided semiconductor ceramics La 1 x Ba xCoO 3(X=0,0.1≤X≤0.2)were successfully prepared by sol gel technology. Phase composition and microstructure of the prepared nanoceramics were characterized by means of XRD, specific surface area absorption(BET)and Archimede replacement water method. The results of humidity sensitive characteristic investigation showed that LaCoO 3 nanoceramic sensor exhibits a negative humidity resistance property and La 1 x Ba xCoO 3 nanoceramic sensor exhibits a positive humidity resistance property. It is proposed that negative humidity resistance property of LaCoO 3 nanoceramic sensor may be explained with proton(H +)theory, and positive humidity resistance property of La 1 x Ba xCoO 3(0.1≤X≤0.2)nanoceramic sensor may be explained with P type carrier([JX-2])quantity in grain boundary.

关 键 词：纳米陶瓷 钴酸镧钡 湿敏性能 湿敏机制 半导体陶瓷 

分 类 号：TQ174[化学工程—陶瓷工业]