Novel Au-Ag hybrid device for electrochemical SE(R)R spectroscopy in a wide potential and spectral range

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Jiu Ju Feng - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Ulrich Gernert - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Murat Sezer - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Uwe Kuhlmann - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Daniel H. Murgida - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Christin David - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Marten Richter - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Andreas Knorr - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Peter Hildebrandt - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)
  • Inez M. Weidinger - , Technische Universität Berlin, Universidad de Buenos Aires (Autor:in)

Abstract

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.

Details

OriginalspracheEnglisch
Seiten (von - bis)298-303
Seitenumfang6
FachzeitschriftNano letters
Jahrgang9
Ausgabenummer1
PublikationsstatusVeröffentlicht - Jan. 2009
Peer-Review-StatusJa
Extern publiziertJa

Externe IDs

PubMed 19102702