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Issue 21, 2012

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

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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).

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

Article information


Submitted
05 Jul 2012
Accepted
24 Aug 2012
First published
28 Aug 2012

Analyst, 2012,137, 4943-4950
Article type
Paper

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

C. Chang, K. Yang, Y. Liu, C. Yu and Y. Wu, Analyst, 2012, 137, 4943 DOI: 10.1039/C2AN35912J

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