Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 366, Issue 1-3, Pages 163-169Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.06.010
Keywords
Surface-enhanced Raman scattering (SERS); Perchlorate; Silver nanofilm; Copper foil; Galvanic displacement reaction
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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 2.5-50 mM of AgNO3 with the reaction time from 0.5-60 min. 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 105 nm 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 50 mu g L-1 for perchlorate. (C) 2010 Elsevier B.V. All rights reserved.
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