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Resistive humidity sensor using phosphonium salt-containing polyelectrolytes based on the mutually cross-linkable copolymers

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Abstract

Two kinds of mutually cross-linkable copolymers were prepared to be used as humidity-sensing materials. The humidity-sensitive thin films consist of cross-linked polyelectrolytes of the following component: 4-vinylbenzyl dimethyl 2-(dimethylphosphino)ethyl phosphonium chloride (1)/ bis(2-methoxyethyl)itaconate (2)= 3/1, 2/1, 1/1 and 1/2 and 4-vinylbenzyl chloride (3)/ vinylbenzyl tributyl phosphonium chloride (4)= 3/1, 2/1, 1/1 and 1/2. The humidity sensor prepared from the reaction of1/2= 2/1 with3/4= 2/1 showed an average resistance of 723, 36.2 and 2.42 kΩ at 30, 60 and 90%RH, respectively. Temperature dependence, frequency dependence, and response time were measured and the reliability test such as water durability and long-term stability were also estimated.

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Authors and Affiliations

  1. Dept. of Chemistry, Dankook University, 330-714, Cheonan, Chungnam, Korea

    Chil-Won Lee & Myoung-Seon Gong

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  1. Chil-Won Lee
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  2. Myoung-Seon Gong
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Lee, CW., Gong, MS. Resistive humidity sensor using phosphonium salt-containing polyelectrolytes based on the mutually cross-linkable copolymers. Macromol. Res. 11, 322–327 (2003). https://doi.org/10.1007/BF03218371

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  • DOI: https://doi.org/10.1007/BF03218371

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