石英晶体微天平
甲基丙烯酸
分子印迹聚合物
甲酸
检出限
甲醛
聚合物
乙醛
材料科学
乙二醇二甲基丙烯酸酯
纳米颗粒
化学工程
共聚物
选择性
化学
色谱法
有机化学
纳米技术
吸附
催化作用
工程类
乙醇
作者
Munawar Hussain,Kira Kotova,Peter A. Lieberzeit
出处
期刊:Sensors
[MDPI AG]
日期:2016-06-30
卷期号:16 (7): 1011-1011
被引量:57
摘要
Herein, we report on molecularly imprinted polymers (MIPs) for detecting formaldehyde vapors in air streams. A copolymer thin film consisting of styrene, methacrylic acid, and ethylene glycol dimethacrylate on quartz crystal microbalance (QCM) yielded a detection limit of 500 ppb formaldehyde in dry air. Surprisingly, these MIPs showed specific behavior when tested against a range of volatile organic compounds (VOCs), such as acetaldehyde, methanol, formic acid, and dichloromethane. Despite thus being a suitable receptor in principle, the MIPs were not useful for measurements at 50% humidity due to surface saturation by water. This was overcome by introducing primary amino groups into the polymer via allyl amine and by changing the coating morphology from thin film to nanoparticles. This led to the same limit of detection (500 ppb) and selectivity as before, but at the real-life conditions of 50% relative humidity.
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