Nanoscale Roughness on Metal Surfaces Can Increase Tip-Enhanced Raman Scattering by an Order of Magnitude

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• 作者：Weihua Zhang ; Xudong Cui ; Boon-Siang Yeo ; Thomas Schmid ; Christian Hafner ; Renato Zenobi
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：7
• 期：5
• 页码：1401 - 1405
• 全文大小：338K
• 年卷期：v.7,no.5(May 2007)
• ISSN：1530-6992

文摘

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