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Humidity sensitivity of hybrid polyelectrolytes prepared by the sol-gel process

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Abstract

Thin-film humidity sensors were prepared using inorganic/organic hybrid polyelectrolytes, which were prepared from the sol-gel reaction of copolymers of [2-(methacryloyloxy)ethyl]dimethylpropylammonium bromide (MEPAB),n-butyl methacrylate(BMA), and 3-(trimethoxysilyl)propyl methacrylate(TSPM) with tetraethyl orthosilicate (TEOS). The humidity-sensitive polyelectrolytes were composed of the copolymers having the following mole ratios of MEPAB, BMA, and TSPM: 60/30/10, 55/30/15, and 50/30/20. We found that the impedance varied with the content of MEPAB or TEOS; it ranged from 107 to 103Ω between 20 and 95% relative humidity, which is the range required for a humidity sensor operating at ambient humidity. In addition we investigated a number of characteristics of these humidity sensors, such as their hysteresis, response time, temperature dependence, frequency dependence, water durability, and long-term stability.

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Authors and Affiliations

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

    Chil-Won Lee, Hyung-Seok Park, Jong-Gyu Kim & Myoung-Seon Gong

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  1. Chil-Won Lee
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  2. Hyung-Seok Park
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  3. Jong-Gyu Kim
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  4. Myoung-Seon Gong
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Lee, CW., Park, HS., Kim, JG. et al. Humidity sensitivity of hybrid polyelectrolytes prepared by the sol-gel process. Macromol. Res. 13, 96–101 (2005). https://doi.org/10.1007/BF03219021

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  • DOI: https://doi.org/10.1007/BF03219021

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