Surface-enhanced Raman scattering-active gold nanoparticles modified with a monolayer of silver film

Chun Chao Chang, Kuang Hsuan Yang, Yu Chuan Liu, Chung Chin Yu, Yi Hao Wu

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

As shown in the literature, electrochemical underpotential deposition (UPD) offers the ability to deposit up to a monolayer of one metal onto a more noble metal with a flat surface. In this work, we develop an electrochemical pathway to prepare more surface-enhanced Raman scattering (SERS)-active substrates with Ag UPD-modified Au nanoparticles (NPs) by using sonoelectrochemical deposition-dissolution cycles (SEDDCs). Encouragingly, the SERS of Rhodamine 6G (R6G) adsorbed on these Ag UPD-modified Au NPs exhibits a higher intensity by ca. 12-fold magnitude, as compared with that of R6G adsorbed on unmodified Au NPs. The prepared SERS-active substrate demonstrates a large Raman scattering enhancement for R6G with a detection limit of 2 × 10-14 M and an enhancement factor of 5.0 × 108. Also, the strategy proposed in this work to improve the SERS effects by using UPD Ag based on SEDDCs has an effect on the smaller probe molecules of 2,2′-bipyridine (BPy).

Original languageEnglish
Pages (from-to)4943-4950
Number of pages8
JournalAnalyst
Volume137
Issue number21
DOIs
Publication statusPublished - Nov 7 2012

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Electrochemistry
  • Biochemistry
  • Environmental Chemistry

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