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A humidity sensor using alkali salt —poly(ethylene oxdide) hybrid films

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Abstract

Impedance-humidity characteristics of alkali salt doped poly(ethylene oxide) were studied. Complex-plane impedance analyses have been performed. At each humidity and temperature combination, the resistance corresponding to the ionic migration in the bulk of the film has been estimated. The sensor, composed of poly(ethylene oxide) doped with an alkali salt having a high propensity for complex formation between poly(ethylene oxide) and the alkali cation, has 8 good impedance variation in the range 107 to 103Ω by the humidification and desiccation process, and no apparent hystereslis can be observed. The impedance variation is interpretable in terms of the expansion of the free volume by the plasticizing effect of sorbed water.

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Authors and Affiliations

  1. Department of Industrial Chemistry, Faculty of Engineering, Ehime University, 790, Matsuyama, Japan

    Yoshihiko Sadaoka, Yoshiro Sakai & Hisashi Akiyama

Authors
  1. Yoshihiko Sadaoka
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  2. Yoshiro Sakai
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  3. Hisashi Akiyama
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Sadaoka, Y., Sakai, Y. & Akiyama, H. A humidity sensor using alkali salt —poly(ethylene oxdide) hybrid films. J Mater Sci 21, 235–240 (1986). https://doi.org/10.1007/BF01144726

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