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

Fingerprint

Raman Spectrum Analysis
Silver
Gold
Nanoparticles
Raman scattering
Monolayers
silver
gold
scattering
Metals
Dissolution
dissolution
substrate
metal
Substrates
Limit of Detection
Precious metals
nanoparticle
Deposits
probe

ASJC Scopus subject areas

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

Cite this

Surface-enhanced Raman scattering-active gold nanoparticles modified with a monolayer of silver film. / Chang, Chun Chao; Yang, Kuang Hsuan; Liu, Yu Chuan; Yu, Chung Chin; Wu, Yi Hao.

In: Analyst, Vol. 137, No. 21, 07.11.2012, p. 4943-4950.

Research output: Contribution to journalArticle

Chang, Chun Chao ; Yang, Kuang Hsuan ; Liu, Yu Chuan ; Yu, Chung Chin ; Wu, Yi Hao. / Surface-enhanced Raman scattering-active gold nanoparticles modified with a monolayer of silver film. In: Analyst. 2012 ; Vol. 137, No. 21. pp. 4943-4950.
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