2.4.4 Quartz Crystal Microbalance Sensor for Organic Vapor Detection Based on Silica-Based Mesoporous Organic-Inorganic Hybrids
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- 2.4 Resonant Sensors I
- J. Xu, Y. Zhu, Z. Cheng, Q. Zheng - Department of Chemistry, College of Science, Shanghai University (China)
- 217 - 220
Silica-based mesoporous organic-inorganic hybrid materials have examined for their ability to detect vapors of small organic molecules with high sensitivity and selectivity. Mesoporous SBA-15 serves as an inorganic host with high specific surface area, facilitating gas adsorption, and thus leads to highly sensitive response; while the presence of organic functional groups contributes to the greatly improved specific sensing property. The behavior of the tailor-made sensing materials is characterized by quartz crystal microbalance (QCM) transducer. In this mini review, we report two high-performance QCM-based sensors in the application of nerve agent and formaldehyde detection. Hydrogen-bond acidic functional groups and amine were grafted onto SBA-15, respectively. Both of the sensors exhibited high sensitivity and selectivity to the vapor analyzed, with a ppb-level detection limit.