Two-dimensional combinatorial investigation of raman and fluorescence enhancement in silver and gold sandwich substrates

T. W H Oates, Y. Shiratori, Suguru Noda

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)9588-9594
Number of pages7
JournalJournal of Physical Chemistry C
Volume113
Issue number22
DOIs
Publication statusPublished - 2009 Jun 4
Externally publishedYes

Fingerprint

Aluminum Oxide
Silver
Gold
Alumina
aluminum oxides
Fluorescence
silver
gold
fluorescence
augmentation
Substrates
Sandwich structures
sandwich structures
rhodamine
spacers
Raman scattering
coverings
Raman spectra
Nanoparticles
Scanning

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Two-dimensional combinatorial investigation of raman and fluorescence enhancement in silver and gold sandwich substrates. / Oates, T. W H; Shiratori, Y.; Noda, Suguru.

In: Journal of Physical Chemistry C, Vol. 113, No. 22, 04.06.2009, p. 9588-9594.

Research output: Contribution to journalArticle

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