Novel Au−Ag Hybrid Device for Electrochemical SE(R)R Spectroscopy in a Wide Potential and Spectral Range

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• 作者：Jiu-Ju Feng ; Ulrich Gernert ; Murat Sezer ; Uwe Kuhlmann ; Daniel H. Murgida ; Christin David ; Marten Richter ; Andreas Knorr ; Peter Hildebrandt ; Inez M. Weidinger
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：January 14, 2009
• 年：2009
• 卷：9
• 期：1
• 页码：298-303
• 全文大小：272K
• 年卷期：v.9,no.1(January 14, 2009)
• ISSN：1530-6992

文摘

A nanostructured gold−silver-hybrid electrode for SER spectroelectrochemistry was developed which advantageously combines the electrochemical properties and chemical stability of Au and the strong surface enhancement of (resonance) Raman scattering by Ag. The layered device consists of a massive nanoscopically rough Ag electrode, a thin (2 nm) organic layer, and a ca. 20 nm thick Au film that may be coated by self-assembled monolayers for protein adsorption. The SERR-spectroscopic and electrochemical performance of this device is demonstrated using the heme protein cytochrome c as a benchmark model system, thereby extending, for the first time, SE(R)R studies of molecules on Au surfaces to excitation in the violet spectral range. The enhancement factor is only slightly lower than for Ag electrodes which can be rationalized in terms of an efficient transfer of plasmon resonance excitation from the Ag to the Au coating. This mechanism, which requires a thin dielectric layer between the two metals, is supported by theoretical calculations.