Electrochemically Synthesized Porous Ag Double Layers for Surface-Enhanced Raman Spectroscopy Applications

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Shiwei Shu
  • Chun-Kwan Tsang
  • Chris Lee
  • Qingguo Shao

Detail(s)

Original languageEnglish
Pages (from-to)6340-6345
Journal / PublicationLangmuir
Volume35
Issue number19
Online published26 Apr 2019
Publication statusPublished - 14 May 2019

Abstract

Double-layered nanoporous silver is fabricated by dealloying an electrodeposited AgCu double layer with different compositions in each layer. The pore/ligament size and porosity of each layer can be conveniently tailored by controlling the applied voltage profile when electrodepositing the AgCu double-layer precursors. Therefore, nanoporous Ag double layers with a tailor-made porous profile along the film thickness can be easily fabricated. The Ag structures thus obtained are particularly attractive as novel multifunctional enhancement substrates for surface-enhanced Raman spectroscopy (SERS) applications. When a higher porosity is created in the top layer, the double layer can trap more light because of the antireflection effect, enabling stronger SERS enhancement. On the other hand, with smaller pores formed in the top layer, the double layer readily works as a size-screening SERS substrate that can help distinguish SERS signals from a mixture of reagents with different sizes. The theoretical simulation shows good agreement with the experimental observation.

Citation Format(s)

Electrochemically Synthesized Porous Ag Double Layers for Surface-Enhanced Raman Spectroscopy Applications. / Zhan, Yawen; Shu, Shiwei; Tsang, Chun-Kwan; Lee, Chris; Shao, Qingguo; Lu, Jian; Li, Yang Yang.

In: Langmuir, Vol. 35, No. 19, 14.05.2019, p. 6340-6345.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review