Strategy for obtaining improved surface-enhanced Raman scattering by combining electrochemical and plasmas technologies

Chee Chan Wang, Yu Chuan Liu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this work, surface-enhanced Raman scattering (SERS)-active gold substrates were first developed by combining the technologies of oxidation-reduction cycles (ORCs) and plasmas treatments in roughening metal substrates. First, a gold substrate was treated by argon plasmas. Then the treated gold substrate was further roughened by triangular-wave ORCs in an aqueous solution containing 0.1 M HCl. Encouragingly, the SERS of Rhodamine 6G (R6G) adsorbed on this roughened gold substrate modified by argon plasmas pretreatment exhibits a higher intensity by 10-fold of magnitude and a better resolution, as compared with the SERS of R6G adsorbed on an unmodified roughened gold substrate. Meanwhile, the probing concentration of R6G adsorbed on the modified substrate can be reduced by one order. It was also found that the pretreatment of argon plasmas demonstrates a positive effect on the (2 2 0) face of Au partly changing into the (1 1 1) face with the lowest surface energy after the ORCs roughening, which is contributive to the improved SERS observed.

Original languageEnglish
Pages (from-to)1199-1204
Number of pages6
JournalElectrochemistry Communications
Volume7
Issue number12
DOIs
Publication statusPublished - Dec 2005
Externally publishedYes

Keywords

  • Oxidation-reduction cycles
  • Plasmas
  • Surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

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