擴大中孔矽材孔徑擔載高密度金奈米粒子應用於表面增強拉曼光譜偵測對硝基苯硫酚

THUIR > College of Science > Department of Chemistry > Theses and Dissertations > Item 310901/25969

Please use this identifier to cite or link to this item: http://140.128.103.80:8080/handle/310901/25969

Title:	擴大中孔矽材孔徑擔載高密度金奈米粒子應用於表面增強拉曼光譜偵測對硝基苯硫酚
Other Titles:	Highly ordered and Densely packed Au NPs@ePSS for detection of 4-nitrothiophenol by Surface Enhanced Raman Scattering spectroscopy
Authors:	王立平 Lee ping Wang
Contributors:	賴英煌化學系
Keywords:	中孔材料;表面增顯拉曼;金奈米粒子 mesoporous;Au nanoparticle;SERS;4-nitrothiophenol
Date:	2015
Issue Date:	2015-12-15T07:42:06Z (UTC)
Abstract:	表面增顯拉曼光譜廣泛用於各種領域中，如生醫、材料、分析、免疫等。因此，製備有效的表面增顯拉曼基材，成為近年研究所關注的對象。在本篇研究中，以TIPB作為擴孔劑，於氣液界面成長具介觀結構之擴大孔徑二氧化矽薄膜，並運用光催化法於介觀結構中擔載金奈米粒子，創造高密度熱點，並運用於表面增顯拉曼中。小角度X光散射與穿透式電子顯微鏡圖像結果指出此二氧化矽薄膜為二維六角晶型結構(2D hexagongal)，擴孔劑TIPB能有效擴大孔徑，金奈米粒子緊密擔載於介觀結構中；X光繞射圖譜也證實金奈米粒子的存在。在表面增顯拉曼量測中，此複合材能有效增顯拉曼訊號分子4-MBA與4-NTP，最低偵測極限可到0.05 nM；而在競爭吸附實驗中，發現4-NTP較4-MBA易於吸附在此複合材上。 Surface enhanced Raman scattering(SERS) spectra are widely used in various fileds, such as biomedical, material, analysis, immunology. Therefore, more research is interested to synthesize the more effective SERS materials. In this study we use TIPB as swelling agent to expand the mesopore sturcture and synthesis at the air-water interface. The gold nanoparticles (NPs) can be direct reduced along the pre-embeded polyoxometalates (photocatalytic agents) at the channel, thereby, forming highly interconnected metal NPs of uniform particle size in the 2D hexagonally packed SiO2. In addition, we were create hot-spot at the junctions between NPs, to application in SERS spectra. Results of small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) indicate that the mesostructure of as-synthesized silica thin film are 2D-hexagonal, p6mm. The swelling agent, TIPB can epxand the mesostructure effectively. TEM images show the gold NPs were closely pacing and uniformly in mesostructure. X-ray diffraction (XRD) resluts also verify the formation of GNPs. In SERS measurement, ePSS-GNP can enhance 4-MBA and 4-NTP Raman signal effectively. The 4-NTP can be reach the detection limit of 0.05 nano molar. In competitive adsorption experiment, ePSS-GNP are more likely adsorb 4-NTP than 4-MBA.
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