Sonoelectrochemical synthesis of spike-like gold-silver alloy nanoparticles from bulk substrates and the application on surface-enhanced Raman scattering

Yu Chuan Liu, Kuang Hsuan Yang, Shung J. Yang

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14 Citations (Scopus)

Abstract

The synthesis of non-spherical spike-like gold-silver alloy nanoparticles on platinum substrates was first developed by sonoelectrochemical methods in this study. First, a silver substrate was roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 M HCl. Silver-containing complexes were found in the solution after the ORC treatment. Then a gold substrate was subsequently roughened by the similar ORC treatment in the same silver complexes-containing solution. After this procedure, Au- and Ag-containing complexes were left in the solution. Subsequently, the Au working electrode was immediately replaced by a Pt electrode. A cathodic overpotential was applied under controlled sonication and slight stirring to synthesize Au-Ag alloy nanoparticles on the Pt substrate. Encouragingly, the surface-enhanced Raman scattering (SERS) of Rhodamine 6G on the Au-Ag alloy nanoparticles-deposited Pt substrate exhibits a higher intensity by eight-fold of magnitude and a better resolution, as compared to that obtained on the Au nanoparticles-deposited Pt substrate.

Original languageEnglish
Pages (from-to)290-294
Number of pages5
JournalAnalytica Chimica Acta
Volume572
Issue number2
DOIs
Publication statusPublished - Jul 21 2006
Externally publishedYes

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Keywords

  • Gold-silver alloy nanoparticles
  • Oxidation-reduction cycle
  • Sonoelectrochemical methods
  • Spike-like structure
  • Surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

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