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Two-dimensional combinatorial investigation of raman and fluorescence enhancement in silver and gold sandwich substrates
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
University of Tokyo.
University of Tokyo.
2009 (English)In: Journal of Physical Chemistry C, ISSN 1932-7447, Vol. 113, no 22, 9588-9594 p.Article in journal (Refereed) Published
Abstract [en]

We present a two-dimensional combinatorial investigation of resonant Raman and fluorescence enhancement in silver and gold sandwich structures. Gold and silver, separated by a thin alumina spacer layer, were deposited in two orthogonal gradients, with a thickness from a few hundred to a few nanometers, covering the range from island films through percolation to continuous films. Resonant Raman spectra of Rhodamine 6G adsorbed on the substrate surface were recorded in a 13 × 13 matrix using an automated scanning stage. The most Raman-active substrates were composed of silver (8 nm)-on-alumina (7 nm)-on-gold (5 nm). They consist of both gold and silver discontinuous nanoparticle films separated by alumina, forming a labyrinthine network structure. Gold-on-alumina-on-silver substrates also displayed increased activity compared with that of goldon-alumina substrates. Maximum fluorescence intensity was observed on silver films nominally 35 nm thick covered by 8 nm of alumina. The efficacy of the combinatorial method to correlate multiple aspects of the measurements and reduce uncertainties is demonstrated.

Place, publisher, year, edition, pages
2009. Vol. 113, no 22, 9588-9594 p.
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-21327DOI: 10.1021/jp900436aOAI: diva2:241066
Available from: 2009-09-30 Created: 2009-09-30 Last updated: 2009-09-30

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Oates, Thomas
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Department of Physics, Chemistry and BiologyThe Institute of Technology
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