研究了不同配比导电炭黑和羟乙基纤维素(HEC)感湿胶制备的碳湿敏元件的感湿特性,探讨了山梨醇增湿剂对感湿非线性特性的影响.对碳湿敏元件的体积电阻率、湿敏特性和复阻抗谱的测试结果表明,炭黑含量和山梨醇含量对非线性感湿特性有很大影响,2%炭黑试样在80%湿度附近开始出现电阻的非线性增大;适量山梨醇使试样的非线性湿度响应移向较低湿度区.试样的复阻抗谱在54%湿度时为1个带拖尾的半圆弧,80%湿度时变为带拖尾的2个半圆弧,更高湿度时是拖尾拉长变形明显的2个半圆弧,表明其等效电路是由包括体电阻、炭黑粒界电阻和电极接触电阻三个阻容并联体的串联组成.半圆弧数目随湿度增加的现象,与感湿膜中水分子增加使不同极化机制的作用变得更加明显有关.
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