Excitation wavelength dependent surface enhanced Raman scattering of 4-aminothiophenol on gold nanorings

Excitation wavelength dependent surface enhanced Raman scattering of 4-aminothiophenol on gold nanorings

Detailed understanding of the underlying mechanisms of surface enhanced Raman scattering (SERS) remains challenging for different experimental conditions. We report on an excitation wavelength dependent SERS of 4-aminothiophenol molecules on gold nanorings. SERS and normal Raman spectra, combined wi...

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Veröffentlicht in:Nanoscale 2012-01, Vol.4 (5), p.166-1611
Hauptverfasser: Ye, Jian, Hutchison, James Andell, Uji-i, Hiroshi, Hofkens, Johan, Lagae, Liesbet, Maes, Guido, Borghs, Gustaaf, Van Dorpe, Pol
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container_end_page 1611
container_issue 5
container_start_page 166
container_title Nanoscale
container_volume 4
creator Ye, Jian
Hutchison, James Andell
Uji-i, Hiroshi
Hofkens, Johan
Lagae, Liesbet
Maes, Guido
Borghs, Gustaaf
Van Dorpe, Pol
description Detailed understanding of the underlying mechanisms of surface enhanced Raman scattering (SERS) remains challenging for different experimental conditions. We report on an excitation wavelength dependent SERS of 4-aminothiophenol molecules on gold nanorings. SERS and normal Raman spectra, combined with well-characterized surface morphology, optical spectroscopy and electromagnetic (EM) field simulations of gold nanoring substrates indicate that the EM enhancement occurs at all three excitation wavelengths (532, 633 and 785 nm) employed but at short wavelengths (532 and 633 nm) charge transfer (CT) results in additional strong enhancements of particular Raman transitions. These results pave the way to further understanding the origin of the SERS mechanism. Excitation wavelength dependent SERS of 4-aminothiophenol molecules on nanorings indicates charge transfer results in additional strong enhancements of particular Raman transitions.
doi_str_mv 10.1039/c2nr11805j
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title Excitation wavelength dependent surface enhanced Raman scattering of 4-aminothiophenol on gold nanorings
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