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Detection of adsorption sites at the gap of a hetero-metal nano-dimer at the single molecule level

Paper ID Volume ID Publish Year Pages File Format Full-Text
26722 43973 2011 6 PDF Available
Title
Detection of adsorption sites at the gap of a hetero-metal nano-dimer at the single molecule level
Abstract

In situ surface-enhanced Raman scattering (SERS) measurements were carried out using Au homo, Ag homo and Au–Ag hetero-dimer structures with controlled gap distances. Controlled adsorption of 2,2′-bipyridine and 4,4′-bipyridine molecules onto the surface of metals in an aqueous solution resulted in characteristic SERS peak shifts reflecting switching of the adsorption site at the gap of the Au–Ag hetero-dimer. Changes in the relative intensities and the wavenumbers of the SERS bands provided information on the adsorption environment of the target molecule at the single molecule level.

► We succeeded in preparing a SERS active Au–Ag hetero nanodimer structure. ► The orientation of target molecules at the gaps of the hetero-dimer were evaluated qualitatively. ► The switching of the adsorption site between different metals was observed as the change in the SERS spectra. ► Novel feature of the SERS spectra suggests the formation of a single molecular bridge at the gap.

Keywords
Surface-enhanced Raman scattering; Heterometal nanodimer; Single molecule spectroscopy; Adsorption site
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Detection of adsorption sites at the gap of a hetero-metal nano-dimer at the single molecule level
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 221, Issues 2–3, 25 June 2011, Pages 169–174
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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