Polymeric humidity sensor using organic/inorganic hybrid polyelectrolytes

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• 作者：Chil-Won Lee ; Hyung-Seok Park ; Jong-Gyu Kim ; Byoung-Koo Choi ; Sang-Woo Joo and Myoung-Seon Gong
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2005
• 期刊代码：161_09254005
• 类别：et
• 出版时间：2005
• 卷：109
• 期：2
• 页码：315-322
• 文件大小：399 K

摘要

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 10⁷ to 10³ Ω 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.