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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。
The wet-sensing properties of carbon-based humidity-sensitive elements prepared with different proportions of conductive carbon black and hydroxyethyl cellulose (HEC) wet glue were investigated. The effects of sorbitol wetting agent on the wet-feel nonlinearity were discussed. The results of volume resistivity, moisture sensitivity and complex impedance spectroscopy of the carbon sensor show that the carbon black content and sorbitol content have a great influence on the nonlinear wet-feel property. The 2% Non-linear increases in resistance begin to appear around; the amount of sorbitol moves the non-linear moisture response of the sample to the lower humidity zone. The complex impedance spectrum of the sample is a trailing semicircular arc at 54% humidity and becomes two semi-circular arcs with a trailing edge at 80% humidity, and the trailing elongation is obviously deformed at higher humidity 2 semicircular arcs, indicating that the equivalent circuit is composed of a series resistance including body resistance, carbon black grain boundary resistance and electrode contact resistance of three resistance capacity in parallel. The phenomenon that the number of semicircular arcs increases with the humidity increases with the increase of water molecules in the wet film, which makes the role of different polarization mechanisms more obvious.