A Quartz Crystal Microbalance-Based Sensor System Coated with Functional Polymers for SO2 and NO2 Detection

作者：Yang Chang Yel; Hwang Min Jin; Ryu Dong Wan; Park Jong Ho; Ryu Min Su; Moon Hee^*

来源：Journal of Nanoscience and Nanotechnology, 2011, 11(8): 7189-7192.

DOI：10.1166/jnn.2011.4790

• QCM-Based Sensor
• SO2 and NO2
• Functional Polymers
• High Sensitivity

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.

• 出版日期2011-8