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

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.