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Dielectric Properties of Barium Titanate Humidity Sensor
Author(s): 
Pages: 3-4,9
Year: Issue:  4
Journal: MEASUREMENT & CONTROL TECHNOLOGY

Keyword:  湿敏元件纳米材料介电特性介电损耗;
Abstract: 制备了电阻式纳米钛酸钡湿敏元件,测试了元件的阻抗、电容,以及介电损耗特性.测试频率对元件的阻抗-相对湿度特性曲线影响较大,特别是低湿范围.100 Hz时曲线的线性度最好.元件的电容在低频范围随相对湿度的升高而增大,但高频范围几乎不随相对湿度变化.在10~105 Hz频率范围内,湿敏元件在11%~98%RH范围都出现了介电损耗的极大值,而且随着相对湿度增大,介电损耗极大值向高频方向移动.分析实验结果,在环境水分子浓度变化时,不仅电阻式湿敏元件感湿材料的电阻发生变化,介电常数也发生变化,水分子的极化也同时存在,但是其电阻随相对湿度的变化最为明显.
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