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

研究成果: 雜誌貢獻文章同行評審

11 引文 斯高帕斯(Scopus)

摘要

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).

原文英語
頁(從 - 到)4943-4950
頁數8
期刊Analyst
137
發行號21
DOIs
出版狀態已發佈 - 十一月 7 2012

ASJC Scopus subject areas

  • 分析化學
  • 生物化學
  • 環境化學
  • 光譜
  • 電化學

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