厚膜型La_2CuO_4的氧敏性能  

Oxygen-Sensing Properties of La_2CuO_4 Thick Film

作　　者：赵伟杰[1] 赵辉[1] 霍丽华[1] 高山[1] 

机构地区：[1]黑龙江大学化学化工与材料学院

出　　处：《应用化学》2007年第12期1409-1413,共5页Chinese Journal of Applied Chemistry

基　　金：黑龙江省杰出青年基金项目资助

摘　　要：采用甘氨酸-硝酸盐法合成了La2CuO4复合氧化物，并制成厚膜型氧敏元件。结果表明，在400-700℃之间，厚膜型La2CuO4的灵敏度随着测试温度的升高而逐渐降低。La2CuO4气敏元件的灵敏度（Rn2／Ro2）主要由表面载流子浓度决定，随着测试温度的升高，吸附氧在粒子表面的脱附速率增大，导致空穴载流子浓度随温度的升高而降低，从而使灵敏度下降。厚膜型La2CuO4在400℃时的灵敏度最大，可以达到29．6，远大于烧结型La2CuO4的灵敏度，且厚膜型La2CuO4在400℃对于氧分压变化具有快速的响应，响应时间约为4S。Perovskite-type oxide La2CuO4 was synthesized by the glycine-nitrate process （GNP）. The thick film type oxygen-sensing element was fabricated and its oxygen-sensing properties were investigated. The sensitivity of the thick-film La2CuO4 decreased with the increase of the measurement temperature because the oxygen-sensing properties of La2 CuO4 was mainly determined by the surface carrier concentration. Oxygen adsorbed on the surface of the La2CuO4 thick films desorbed rapidly with the increase of the measurement temperature, which resulted in decrease of the surface carrier concentration. The highest sensitivity of the thick-film La2CuO4 obtained at 400℃ was 29.6, much higher than that of the sintered bulk ones. The corresponding response time of the thick-film sensors to the change of oxygen partial pressure was about 4 seconds at 400℃.

关 键 词：LA2CUO4 厚膜 氧敏性 

分 类 号：O614[理学—无机化学]