| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 105 === The fiber-optic capillary (FOCap) detector was developed as gas chromatography (GC) detector for voltaic organic compounds (VOCs) using the nanocomposite materials localized surface plasmon resonance (LSPR) intensity variance. These nanocomposites coated FOCap detector was designed to integrate micro GC system by using low power selected wavelength LED and photodiode amplified by a lock-in amplifier (LIA). Two nanocomposites materials (mesoporous silica coated gold nanoparticles (SiO2@AuNPs) and thiolate protected gold nanocomposited porous polymer (C12-AuNPs@poly(GMA-EDMA)) were selected to be immobilized on the FOCap as sensing materials. The LSPR intensity was enhanced by eluting VOCs for both nano materials. With CCD measurements, the light intensity in the LSPR range can be used as GC signals for VOCs eluents measurement. The SiO2@AuNPs coated FOCap detector has been demonstrated high sensitivity for common VOCs detection, especially for polar targets. The limits of detection (LOD) were range from 2.56 to 274.4 ng because of different volatility and affinity between target VOCs and SiO2@AuNPs. The SiO2@AuNPs coated FOCap detector was effected by polar target compounds in signal recovery and performance. For future integration in a micro GC system, the light intensity over LSPR range was evaluated by a photodiode with wavelength selected LED as light source and a LIA. The emitting range range of LED was laid in the LSPR range. The photodiode signals were amplified by a LIA and LED was modulated by an optical chopper. A thiolate protected gold nanocomposites porous polymer coated FOCap detector was obtained by a LIA system and the performance of FOCap detector was improved. The best LOD can be down to 4.2 ng ((R)-(+)-limonene). With low power consumption and good performance, the nanocomposites coated FOCap detector can be used as micro GC detector.
|
|---|
