Polymeric humidity sensor using organic/inorganic hybrid polyelectrolytes

초록

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]dimethyl propyl ammonium bromide (MEDPAB), n-butyl methacrylate (BMA) and 3-(trimethoxysilyl)propyl methacrylate (TMSPM) with colloidal silica. The humidity-sensitive polyelectrolytes were composed of copolymers with different contents of MEDPAB/BMA/TMSPM=60/30/10, 55/30/15 and 50/30/20. It was found that the resistance varied according to the content of MEDPAB and colloidal silica. The resistance ranged from 10(7) to 10(3) Omega between 20% and 95% RH, which was required for a humidity sensor operating at ambient humidity. The characteristics of humidity sensor, such as hysteresis, response time, temperature dependency, frequency dependency, water durability and long-term stability were further studied. (C) 2005 Elsevier B.V All rights reserved.

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