Surface enhanced Raman spectroscopy of organic molecules deposited on gold sputtered substrates

Aggregates of Au nanoparticles have been extremely easily obtained on glass substrates by physical sputtering under primary vacuum. With such a protocol, we demonstrate that it is possible to control the surface plasmon band absorption. Surface enhanced Raman spectroscopy (SERS) experiments were per...

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Bibliographic Details
Published in:Nanotechnology 2009-05, Vol.20 (21), p.215705-23
Main Authors: Merlen, A, Gadenne, V, Romann, J, Chevallier, V, Patrone, L, Valmalette, J C
Format: Article
Language:English
Subjects:
Chemical Sciences
Computer Simulation
Engineering Sciences
Gold - chemistry
Light
Models, Chemical
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - methods
Organic Chemicals - chemistry
Particle Size
Physics
Scattering, Radiation
Spectrum Analysis, Raman - methods
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Summary:Aggregates of Au nanoparticles have been extremely easily obtained on glass substrates by physical sputtering under primary vacuum. With such a protocol, we demonstrate that it is possible to control the surface plasmon band absorption. Surface enhanced Raman spectroscopy (SERS) experiments were performed with methylene blue, zinc octacarboxyphthalocyanine, 4-aminothiophenol and cysteamine. The correlation between the absorption band and the wavelength giving the highest SERS intensity is clearly observed for methylene blue, in accordance with the electromagnetic enhancement theory. For the other molecules, effects of the chemical enhancement are also observed. In addition, we noticed a strong influence of the nature of the adsorbed molecule on the enhancement factor for a given wavelength. The origin of this feature is discussed in terms of resonant effects or multipolar surface plasmon modes.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/20/21/215705