Surface Modification on Silver Nanoparticles for Enhancing Vapor Selectivity of Localized Surface Plasmon Resonance Sensors and Establishment of Automatic Test System for MEMS Vapor Preconcentrator

• Main Authors: Chen Yu-Quan, 陳昱銓
• Other Authors: Lu Chia-Jung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/88769091759049549704

碩士 === 輔仁大學 === 化學系 === 96 === This research uses silver nanoparticles as the localized surface plasmon resonance (LSPR) sensors that were surface functionalized with various thiolate self-assemble monolayers (SAM) to provide chemical selectivity for detecting volatile organic compounds. The changes of LSPR spectrum were measured by UV-visible spectrum. One bared and three surface-modified nanoparticle LSPR sensors generated distinguishable patterns for the tested organic vapors with different functional groups. The SAM modification not only altered the surface chemical affinity but also moderately improved the LOD without slowing the response time. The second part of this thesis is to set up automatic test system for microfabricated preconcentration focuser (μ-PCF). The μ-PCF has aluminum layer heater on the back and packed with three stages of adsorbents. The system was controlled by computer via data acquisition interface. The software of test system was written in LabVIEW. 15 mixed VOCs were successfully sampled and injected for GC analysis. The cross interference of polar and non-polar compounds during sampling on μ-PCF were investigated. Finally, we applied Wheeler model to describe the behavior of μ-PCF under different sample conditions.