Surface-enhanced Raman scattering analysis of perchlorate using silver nanofilms deposited on copper foils

Jumin Hao, Zhonghou Xu, Mei Juan Han, Shiyou Xu, Xiaoguang Meng

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Surface-enhanced Raman scattering (SERS) has recently emerged as a tremendous potential method for chemical and biomolecular sensing. SERS analysis of perchlorate using Ag nanofilms deposited on Cu foils (Ag-Cu films) by galvanic displacement reaction was investigated for the first time in this work. The Ag-Cu films were prepared in the solutions containing 2.5-50mM of AgNO3 with the reaction time from 0.5-60min. The relationship between the surface nanostructures of the Ag-Cu films and the SERS sensitivity of perchlorate was examined. The close-packed Ag nanoparticles with an average diameter of 105nm yielded the highest SERS enhancement for perchlorate. Standard calibration curves were prepared with SERS spectra recorded on this optimum Ag-Cu film. At low concentration and in a narrow concentration range, a linear relationship between peak areas and perchlorate concentrations was observed, while a log-log plot yielded a linear relationship over a broad concentration range. The detection limit was determined to be 50μgL-1 for perchlorate.

Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume366
Issue number1-3
DOIs
StatePublished - Aug 2010

Keywords

  • Copper foil
  • Galvanic displacement reaction
  • Perchlorate
  • Silver nanofilm
  • Surface-enhanced Raman scattering (SERS)

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