贵金属纳米结构阵列的LSPR调制及其近红外表面增强拉曼散射效应

On account of the engineering of Localized Surface Plasmon Resonance(LSPR) of noble metal nanostructured arrays and their Near Infrared Surface Enhanced Raman Scattering(NIR-SERS) effect,this project aim at fabricate noble metal nanostructured arrays with controllrabe LSPR in NIR region based on monolayer colloidal crystal template, and probe into the mechanism of NIR-SERS.The content of this project including: fabricate and optimizate of noble metal nanostructrued arrays; realize the modulation of LSPR in NIR region of the arrays by adjusting the shape and the size of nano-unit, the gap between two adjacent nano-units, and investigate the dependence of position and width of LSPR on parameter of the arrays; obtain the substrate with LSPR matched with the excitated wavelength and study the NIR-SERS of the arrays, and set up the relation among the excitated wavelength, LSPR and the NIR-SERS;explore the influence of the factor such as laser power on NIR-SERS ;simulate the electromagnetic field distributed near surface of the arrays using FDTD method, and make clear the mechanism of NIR-SERS, and lay the foundation for practicability and device based on NIR-SERS effect.

针对贵金属纳米结构阵列的局域表面等离子共振（LSPR）的调制及其近红外表面增强拉曼散射效应（NIR-SERS）问题，本项目基于单层胶体晶体模板构筑贵金属纳米结构阵列，实现阵列的LSPR在近红外区域的调控，探索其NIR-SERS效应增强机理。主要内容包括：贵金属纳米结构阵列的构筑与结构参数优化；调制纳米单元的形状、尺寸以及纳米单元之间的间隔实现阵列的LSPR在近红外区域的调控，探究LSPR峰位、峰宽随阵列结构参数的变化规律；获得LSPR与激发波长相匹配的衬底，研究其NIR-SERS效应，建立激发波长、阵列的LSPR及NIR-SERS信号之间的关联性；考察激光激发功率等测试因素在NIR-SERS中的影响；利用FDTD方法，模拟阵列表面电磁场分布，揭示NIR-SERS效应增强机理，为基于NIR-SERS的痕量探测的器件化和实用化奠定基础。

在本项目的资助下，针对贵金属纳米结构阵列的局域表面等离子共振（LSPR）的调控及其近红外表面增强拉曼散射效应（NIR-SERS）问题，开展了基于单层胶体晶体模板的贵金属纳米结构阵列的构筑，实现了阵列的LSPR在近红外区域的调控，探索了其NIR-SERS效应增强机理，获得了LSPR与激发波长相匹配的衬底，研究其NIR-SERS效应，建立激发波长、阵列的LSPR与NIR-SERS信号之间的关联性；利用FDTD方法，模拟了阵列表面电磁场分布，为基于NIR-SERS的痕量探测的器件化和实用化奠定基础。