Silver Nanoparticle Arrays on a DVD-Derived Template: An easy&cheap SERS Substrate |
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Authors: | Giuseppe Giallongo Roberto Pilot Christian Durante Gian Andrea Rizzi Raffaella Signorini Renato Bozio Armando Gennaro Gaetano Granozzi |
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Institution: | (1) Department of Chemical Sciences and INSTM Research Unit, University of Padova, Via Marzolo, 1, 35131 Padua, Italy; |
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Abstract: | Commercially available digital versatile discs (DVDs) contain a silver-coated spiral distribution of rectangular-shaped grooves
(AgDVD): for the first time, they have been used to produce surface-enhanced Raman scattering (SERS) substrates by electrochemical
deposition of silver nanoparticles (AgNPs@AgDVD). The overall procedure only requires cheap and widely available materials
and can be easily accomplished. Scanning electron microscopy images of AgNPs@AgDVD revealed that small AgNPs (average diameter
about 15 nm) are present within the valleys of AgDVD, whereas over the ridges, the AgNPs are bigger, more densely packed and
with a dendrite-like morphology somewhere. The SERS properties of these substrates have been studied in terms of the enhancement
factor (EF), point-to-point reproducibility and sample-to-sample repeatability. It turned out that high SERS EF and good reproducibility
requirements are both fulfilled. As for repeatability, remarkably better results than typical literature values have been
achieved. Such an easy&cheap preparation along with efficient SERS properties make DVD-derived SERS substrates very good candidates for the development
of convenient and disposable sensing platforms. |
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