Preparation of water-durable humidity sensor by attachment of polyelectrolyte membrane to electrode substrate by photochemical crosslinking reaction
Preparation of water-durable humidity sensor by attachment of polyelectrolyte membrane to electrode substrate by photochemical crosslinking reaction
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DOI：
10.1016/j.snb.2010.04.017
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发表时间：
2010-06
影响因子：
8.4
通讯作者：
M. Gong;Jae-uk Kim;Jong-Gyu Kim
中科院分区：
文献类型：
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作者：
M. Gong;Jae-uk Kim;Jong-Gyu Kim
以含季铵盐的单体[2-（丙烯酰氧基）乙基]二甲基丙基溴化铵（AEPAB）、苯乙烯（ST）、甲基丙烯酸2-羟乙酯（HEMA）和4-丙烯酰氧基二苯甲酮（BPA）为单体，通过共聚反应制备了新型光交联二苯甲酮聚电解质。这些聚电解质是用于湿敏性聚电解质的自交联共聚物，其由具有不同含量的AEPAB/ST/HEMA/BPA=70/25/3/2、70/25/2/3、70/23/5/2和70/23/4/3的共聚物组成。用含有硅烷偶联剂的3-缩水甘油氧基丙基三甲氧基硅烷（GPTMS）对氧化铝基底进行预处理，以通过共价键将湿敏膜锚在基底上。传感器用UV光照射，引起电子激发的二苯甲酮分子形成交联反应。在20%相对湿度（RH）和95% RH之间，电阻范围为107Ω至103Ω，这是传感器在环境湿度下工作所需的湿度范围。测量并评价了它们的耐水性、在各种环境下的长期稳定性、滞后性以及响应和恢复时间，作为湿敏膜。
New photo-crosslinkable benzophenone-containing polyelectrolytes were prepared by copolymerization of quaternary ammonium salt-containing monomer [2-(acryloyloxy)ethyl] dimethyl propyl ammonium bromide (AEPAB), styrene (ST), 2-hydroxyethylmethacrylate (HEMA), and 4-acryloyloxybenzophenone (BPA). These polyelectrolytes are self-crosslinkable copolymers for humidity-sensitive polyelectrolytes composed of copolymers with different contents of AEPAB/ST/HEMA/BPA=70/25/3/2, 70/25/2/3, 70/23/5/2, and 70/23/4/3. Pretreatment of the alumina substrate with 3-glycidoxypropyltrimethoxysilane (GPTMS) containing silane-coupling agent was performed to anchor the humidity-sensitive membrane to the substrate through covalent bonds. The sensors were irradiated with UV light, causing the electronically excited benzophenone molecules to form a crosslinking reaction. The resistance ranged from 107Ω to 103Ω between 20% relative humidity (RH) and 95% RH, the humidity range required for a sensor operating at ambient humidity. Their water durability, long-term stability under various environments, hysteresis, and response and recovery times were measured and evaluated as a humidity-sensing membrane.