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A Two-Layer Gold Surface with Improved Surface Enhancement for Spectro-Electrochemistry Using Surface-Enhanced Infrared Absorption Spectroscopy

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Abstract:

A two-layer gold surface is developed for use with surface-enhanced infrared absorption spectroscopy (SEIRAS) consisting of a conducting underlayer onto which Au nanoparticles (AuNPs) are grown by self-catalyzed electroless deposition. AuNPs are grown on protruding substructures of the 25 nm thin underlayer. The enhancement factor of the two-layer gold surface is controlled by the growth conditions. Cytochrome c adsorbed to a self-assembled monolayer of mercaptoethanol is used as a reference system. Under optimum conditions the absorbance of the amide I band is increased by a factor of 5 versus the classical SEIRAS surface. Reversible reduction/oxidation of cytochrome c on the two-layer gold surface is shown to take place by cyclic voltammetry.

Keywords: CYTOCHROME C; GOLD NANOPARTICLES; SEIRAS; SPECTRO-ELECTROCHEMISTRY; SURFACE-ENHANCED INFRARED ABSORPTION SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370209789379330

Affiliations: 1: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany 2: Austrian Research Centers GmbH, Tech Gate Vienna, Donau-City Str. 1, 1220 Vienna, Austria

Publication date: September 1, 2009

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