ZnO－Li₂O－V₂O₅系湿敏电阻材料感湿机理研究

STUDIES ON SENSATION MECHANISM OF ZnO-Li2O-V2O5 HUMIDITY-SENSITIVE RESISTOR MATERIAL

借助扫描式电子显微镜发现ＺｎＯ－Ｌｉ２Ｏ－Ｖ２Ｏ５系湿敏材料是由ＬｉＺｎＶＯ４玻璃包裹ＺｎＣｒ２Ｏ４晶粒并相互粘结而成，根据ＬｉＺｎＶＯ４玻璃的形成过程及其微观结构，提出了该系湿敏材料的感湿机理，认为嵌在玻璃相空穴中的Ｌｉ＋和Ｌｉ２Ｏ分别构成了玻璃本体电导和感湿点；由此解释了实测的电阻－湿度特性曲线，并提出可以分别通过调节Ｌｉ＋和Ｌｉ２Ｏ的浓度改变材料的本体电阻和感湿灵敏度．

By scanning electron microscope(SEM)that ZnO-Li2O-V2O5 humidity-sensitive ma-terial is composed of ZnCr2O4 grains and LiZnVO4 glass which surrounds the grains andglues them to each other. According to the forming process of LiZnVO4 glass and its mi-crostructure, presents an idea about humidity-sensing mechanism of the material, con-sidering that the Li+ and Li2O inlaid in the holes within the glass form the inherent con-ductance and humidity-snsing points of the glass respectively. On the basis of this pointof vem, interprets the resistance-humidity curves, and points out that inherent resis-tance and humidity sensitivity of the material can be changed by requlating the concen-tration of Li+ and Li2O in the alass individually.