Nanoscale roughness on metal surfaces can increase tip-enhanced Raman scattering by an order of magnitude

被引：151

作者：

Zhang, Weihua

Cui, Xudong

Yeo, Boon-Siang

Schmid, Thomas

Hafner, Christian

Zenobi, Renato ^{[1
]}

机构：

[1] ETH, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland

[2] ETH, Lab Electromagnet Fields & Microwave Elect, CH-8092 Zurich, Switzerland

来源：

NANO LETTERS | 2007年 / 7卷 / 05期

关键词：

D O I：

10.1021/nl070616n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We studied the influence of nanosteps on signal intensity in gap-mode tip-enhanced Raman spectroscopy (TERS). A benzenethiol monolayer adsorbed on an Au substrate was investigated. The correlation between the TERS signal and the local topography on the substrate shows that a 2 nm high sharp step on the Au surface can significantly increase the enhancement. Furthermore, theoretical models were built, and the numerical simulation results were consistent with our experimental results. The findings provide evidence that nanoscale roughness can play a crucial role in the "hot sites" corresponding to single-molecule surface-enhanced Raman spectroscopy (SERS).

引用

页码：1401 / 1405

页数：5

共 30 条

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