Photopolymerized sol-gel materials for capillary electrochromatography and chemical sensor

• Main Authors: Huang-Chin Yang, 楊煌欽
• Other Authors: Lai-Kwan Chau
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/32088088725627303292

碩士 === 國立中正大學 === 化學所 === 94 === This work explores the analytical applications of photopolymerized sol-gel (PSG) materials, namely, capillary electrochromatography and chemical sensing. The precursor for these materials bearing an alkoxyl silane group and a methacrylate group are good candidates for bonded-phase chemistry. One of the advantages of the PSG material is the ability to control the photoactivated area. First part of this work starts from the photopolymerized sol-gel process of methacryloxypropyltrimethoxysilane (MPTMS) and N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMSPT- MA). In the presence of an acid catalyst, water, toluene, and a photoinitiator, the solution mixture of MPTMS and TMSPTMA was irradiated at 254 nm for 15 min to prepare a 3 cm anion-exchange monolithic column by an one-pot process. To demonstrate the preconcentration capability of the monolithic column, different amounts of sample were loaded onto the column, and the analytes (inorganic anions) were then eluted from the column before being separated by electrophoresis. A method based on a 10-min pressure injection resulted in a 16-fold increase in sensitivity for bromide ion (0.01 ppm) relative to that of a bare column, indicating that the material can be used for in-line preconcentration prior to separation. Second part of this study attempts to prepare a hybrid organic- inorganic sol-gel planar waveguide based on MPTMS and titanium n-butoxide. Planar optical waveguide is an attractive optical element for optical chemical sensors. Different techniques including scanning electron microscopy, UV/Vis/NIR spectroscopy, ellipsometry, and infrared spectroscopy have been used to characterize the photoinduced film. The waveguiding film has a low optical propagation loss (0.04 dB/cm-1) and a refractive index of 1.547 (at λ= 532 nm). The thickness of the film had been determined to be about 2.7μm.