贵金属微纳球壳阵列构筑、表面增强Raman散射性能及对多氯联苯的检测

项目名称： 贵金属微纳球壳阵列构筑、表面增强Raman散射性能及对多氯联苯的检测

项目编号： No.51301152

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 何辉

作者单位： 扬州大学

项目金额： 25万元

中文摘要： 针对基于表面增强拉曼散射（SERS）效应的多氯联苯（PCBs）检测中的关键问题，即高SERS活性衬底问题，以聚苯乙烯单层胶体晶体为模板，构筑平方厘米量级贵金属微纳球壳阵列，研究其SERS效应，探究其对PCBs的敏感特性。主要包括：不同结构（排列周期、单元形态与尺寸等）、成分的贵金属微纳球壳阵列的合成、控制及其对SERS活性的影响；研究阵列体系的表面等离子体共振（SPR）效应及其与SERS的关联；考察SERS效应与激发波长的关系；阐明SERS结构增强机理；探寻对PCBs分子高效敏感的阵列表面修饰技术；揭示PCBs浓度与SERS信号间关系。旨在获得具有高SERS活性的贵金属微纳球壳阵列衬底及其构筑方法；揭示阵列SERS效应的增强机理；发展表面修饰技术。为基于SERS效应的PCBs痕量检测提供材料基础，为贵金属微纳球壳阵列的器件化和实用化提供近期可实现性。

中文关键词： 表面增强拉曼散射；多氯联苯；聚苯乙烯胶体球；贵金属微纳球壳；表面修饰

英文摘要： The key impediment for the practical detection of polychlorinated biphenyls (PCBs) based on surface-enhanced Raman scattering (SERS) sensors is the lack of robust and facile fabrication strategies for reproducible SERS substrates with large and stable Raman enhancement. In this item, novel fabrication techniques will be explored to obtain such substrates, namely micro/nanosized noble metal spherical shell arrays with a square centimeter in size, via utilizing monolayer polystyrene sphere templates. Their SERS performance and trace detection of PCBs will be systematically studied from both experimental and theoretical aspects. The main research contents are as follows: preparation of the noble metal spherical shell arrays with controllable and tunable structures (shape, size, and arrangement of the spherical shells) and their corresponding SERS activity; relationship between surface plasma resonance and SERS for these arrays; effect of excitation wavelength on SERS activity during Raman analysis; structurally SERS enhancement mechanism; surface decoration of spherical shells for selectively capturing PCBs; SERS signal evolution with the concentration of PCBs by adopting the optimal substrate after surface decoration. Finally, the structure-optimized noble metal spherical shell array and the efficient surface modi

英文关键词： surface-enhanced Raman scattering (SERS)；polychlorinated biphenyls (PCBs)；polystyrene colloidal spheres；micro/nanostructured spherical noble metal shells；surface modification