Yang Chang-Yel, Hwang Min-Jin, Ryu Dong-Wan, Park Jong-Ho, Ryu Min-Su, Moon Hee
Center for Functional Nano Fine Chemicals and School of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea.
J Nanosci Nanotechnol. 2011 Aug;11(8):7189-92. doi: 10.1166/jnn.2011.4790.
In this work, a quartz crystal microbalance (QCM)-based adsorption sensor system with high sensitivity, selectivity, and reproducibility is designed and fabricated. The functional polymers such as polypyrrole, poly(3,4-ethylenedioxythiophene) (PEDOT), and polystyrene are coated on 8 MHz AT-cut quartz crystal surfaces as sensing materials for SO2 and NO2. All sensing materials on the QCM surface are characterized experimentally by SEM and AFM. The frequency shifts of the QCM by adsorption and desorption of gases are measured and analyzed to assess the practical applicability of the sensor system. The overall results show that the QCM coated with polypyrrole is highly selective for SO2 gas and that coated with PEDOT is for NO2. It is proven that the QCM-based adsorption sensor system is possible for monitoring SO2 and NO2 gases in the mixture of ppm level.
在这项工作中，设计并制造了一种基于石英晶体微天平（QCM）的具有高灵敏度、选择性和重现性的吸附传感器系统。聚吡咯、聚（3,4-乙撑二氧噻吩）（PEDOT）和聚苯乙烯等功能聚合物被涂覆在8 MHz AT切石英晶体表面，作为检测SO2和NO2的传感材料。通过扫描电子显微镜（SEM）和原子力显微镜（AFM）对QCM表面的所有传感材料进行了实验表征。测量并分析了QCM因气体吸附和解吸引起的频率变化，以评估该传感器系统的实际适用性。总体结果表明，涂覆有聚吡咯的QCM对SO2气体具有高度选择性，涂覆有PEDOT的QCM对NO2具有高度选择性。事实证明，基于QCM的吸附传感器系统能够监测ppm级混合物中的SO2和NO2气体。
