1. Novel Au−Ag Hybrid Device for Electrochemical SE(R)R Spectroscopy in a Wide Potential and Spectral Range
- Author
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Andreas Knorr, Inez M. Weidinger, Murat Sezer, Daniel H. Murgida, Peter Hildebrandt, Jiu-Ju Feng, Christin David, Marten Richter, Ulrich Gernert, and Uwe Kuhlmann
- Subjects
Silver ,Materials science ,Físico-Química, Ciencia de los Polímeros, Electroquímica ,Analytical chemistry ,Bioengineering ,Spectrum Analysis, Raman ,Electrochemistry ,Sensitivity and Specificity ,symbols.namesake ,Materials Testing ,Monolayer ,General Materials Science ,Surface plasmon resonance ,Spectroscopy ,Raman ,Nanotecnología ,Mechanical Engineering ,Ciencias Químicas ,SER substrates ,Reproducibility of Results ,Resonance ,Equipment Design ,General Chemistry ,Surface Plasmon Resonance ,Condensed Matter Physics ,Au/Ag nanostructures ,Nanostructures ,Equipment Failure Analysis ,Electrode ,symbols ,Computer-Aided Design ,Gold ,Raman spectroscopy ,CIENCIAS NATURALES Y EXACTAS ,Raman scattering - 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. Fil: Feng, Jiu-Ju. Technishe Universitat Berlin; Alemania Fil: Gernert, U.. Technishe Universitat Berlin; Alemania Fil: Sezer, M.. Technishe Universitat Berlin; Alemania Fil: Kuhlmann, U.. Technishe Universitat Berlin; Alemania Fil: Murgida, Daniel Horacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Inorgánica, Analítica y Química Física; Argentina Fil: David, C.. Technishe Universitat Berlin; Alemania Fil: Richter, M.. Technishe Universitat Berlin; Alemania Fil: Knorr, A.. Technishe Universitat Berlin; Alemania Fil: Hildebrandt, P.. Technishe Universitat Berlin; Alemania Fil: Weidinger, I. M.. Technishe Universitat Berlin; Alemania
- Published
- 2009
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