单分子表面增强共振拉曼散射光谱中的泛音与组合音

Overtones and combinations in single-molecule surface-enhanced resonance Raman scattering spectra.

作者信息

Goulet Paul J G, Pieczonka Nicholas P W, Aroca Ricardo F

机构信息

Materials & Surface Science Group, School of Physical Sciences, University of Windsor, N9B 3P4, Windsor, ON, Canada.

出版信息

Anal Chem. 2003 Apr 15;75(8):1918-23. doi: 10.1021/ac034067r.

DOI:10.1021/ac034067r

PMID:12713051

Abstract

The observation of overtones and combinations in the SERRS spectra of single molecules dispersed in Langmuir-Blodgett monolayers is confirmed for a family of molecules. The detection of fundamentals, combinations, and overtones in single-molecule spectra of a series of perylenetetracarboxylic diimides (PTCD) is achieved with spatially resolved surface-enhanced resonance Raman scattering (SERRS). The Langmuir-Blodgett technique is used to create monomolecular thick films on metal islands containing on average one probed molecule within the field of view of the Raman microscope. The enhancement needed for single-molecule detection is achieved through the multiplicative effects of electromagnetic enhancement by metal nanostructures and resonance Raman enhancement by excitation into molecular electronic absorption bands. Overtone and combination progressions are well resolved in the average SERRS spectra of all three PTCD molecules.

摘要

对于一类分子，在分散于朗缪尔-布洛杰特单分子层中的单分子表面增强共振拉曼光谱（SERRS）中观察到泛音和组合峰得到了证实。通过空间分辨表面增强共振拉曼散射（SERRS）实现了对一系列苝四羧酸二亚胺（PTCD）单分子光谱中的基频、组合峰和泛音的检测。朗缪尔-布洛杰特技术用于在金属岛上制备单分子厚膜，在拉曼显微镜视场内平均含有一个被探测分子。单分子检测所需的增强是通过金属纳米结构的电磁增强和激发进入分子电子吸收带的共振拉曼增强的相乘效应实现的。在所有三种PTCD分子的平均SERRS光谱中，泛音和组合峰进展得到了很好的分辨。