摘要
以枸橼酸钠为表面活性剂,采用共沉淀法制备了氧化锌(ZnO)空心微球.利用X射线衍射(XRD)和透射电镜(TEM)对样品的微结构和表面形貌进行了表征.将ZnO空心球旋涂在金叉指电极上构成湿敏元件.通过半导体测试仪Keithley2400和高精度数字电桥TH2828测量湿敏元件在不同湿度环境中的直流电阻、交流电容和交流阻抗.结果表明,随着湿度的增加,元件的电阻减小,交流电容和阻抗增大(低频范围).通过ZnO空心球在不同湿度环境下复阻抗谱,给出等效电路并解释其湿敏机制.
Zinc oxide(ZnO)hollow microspheres were prepared by coprecipitation with sodium citrate as surfactant.The microstructure and surface morphology of the samples were characterized by X-ray diffraction(XRD)and transmission electron microscopy(TEM).ZnO hollow sphere was applied on the gold finger electrode to form a humidity sensor.The DC resistance,AC capacitance and AC impedance of humidity sensor in different humidity environment were measured by the semiconductor tester Keithley 2400 and the high precision digital bridge TH2828.The results showed that with the increase of humidity,resistance of components was reduced,the AC capacitance and impedance increased(low frequency range).The complex impedance spectrum of ZnO hollow sphere in different humidity environment was detected.The equivalent circuit was given and its humidity sensitive mechanism was explained.
作者
周小岩
张永
周鹏
ZHOU Xiaoyan;ZHANG Yong;ZHOU Peng(College of Science,China University of Petroleum,Qingdao 266580,China)
出处
《信阳师范学院学报（自然科学版）》
CAS
北大核心
2020年第4期617-621,共5页
Journal of Xinyang Normal University(Natural Science Edition)
基金
国家自然科学基金项目(51777215)
大学生创新创业训练计划项目(20181534)。
关键词
ZnO空心球
交流电容
复阻抗
湿敏机理
ZnO hollow sphere
AC capacitance
complex impedance
wet-sensitive mechanism
