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Plasmonic photoluminescence for recovering native chemical information from surface-enhanced Raman scattering

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Plasmonic photoluminescence for recovering native chemical information from surface-enhanced Raman scattering.pdf (672.9Kb)
Date
2017-03
Author
Kai-Qiang Lin
林楷强
Jun Yi
易骏
Jin-Hui Zhong
Shu Hu
Bi-Ju Liu
Jun-Yang Liu
Cheng Zong
Zhi-Chao Lei
Xiang Wang
王翔
Javier Aizpurua
Rubén Esteban
Bin Ren
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  • 化学化工-已发表论文 [14469]
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Abstract
【Abstract】Surface-enhanced Raman scattering (SERS) spectroscopy has attracted tremendous interests as a highly sensitive label-free tool. The local field produced by the excitation of localized surface plasmon resonances (LSPRs) dominates the overall enhancement of SERS. Such an electromagnetic enhancement is unfortunately accompanied by a strong modification in the relative intensity of the original Raman spectra, which highly distorts spectral features providing chemical information. Here we propose a robust method to retrieve the fingerprint of intrinsic chemical information from the SERS spectra. The method is established based on the finding that the SERS background originates from the LSPR-modulated photoluminescence, which contains the local field information shared also by SERS. We validate this concept of retrieval of intrinsic fingerprint information in well controlled single metallic nanoantennas of varying aspect ratios. We further demonstrate its unambiguity and generality in more complicated systems of tip-enhanced Raman spectroscopy (TERS) and SERS of silver nanoaggregates.
Description
表面增强拉曼光谱(SERS)可以提供高达单分子的检测灵敏度和特异的分子指纹信息,是一个非常有前景的分析技术。SERS增强主要源自贵金属纳米结构的局域表面等离激元共振(LSPR)效应。虽然SERS研究者早已意识到该效应强烈依赖于激光波长,并对不同频率的拉曼谱峰增强效果不同,但是迄今为止仍缺乏有效的方法对SERS谱峰相对强度进行可靠的矫正,也常有文献错误解读SERS强度信息,从而过度或错误地解释实验结果。 在该工作中,任斌教授课题组采用单粒子光谱技术从实验上直接检测SERS光谱和金属纳米粒子的光致发光谱(PL),通过定量研究两者的关联,提出了一种普适的方法矫正LSPR对不同拉曼谱峰相对强度的影响,为理解表面物种构型和作用方式提供了本征的化学指纹信息。该工作得到国家自然科学基金委(项目批准号:21633005、21621091和J1310024)、科技部(项目批准号:2013CB933703、2016YFA0200601)、教育部等部门的大力资助与支持。
Citation
Nature Communications,2017,14891
URI
http://dx.doi.org/10.1038/ncomms14891
https://dspace.xmu.edu.cn/handle/2288/127686

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