Silver Nanoparticle Arrays on a DVD-Derived Template: An easy&cheap SERS Substrate
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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.
KeywordsLow-cost SERS substrate Ag nanoparticles on DVD Electrodeposition Good EF and reproducibility
We gratefully acknowledge the assistance of Dr. C. Maccato for the SEM images, Dr. P. Schiavuta (CIVEN) for the AFM measurements and Dr. M. Bersani (University of Padova) for the UV–vis diffuse reflectance measurements. This work has been supported through the Progetto Strategico PLATFORMS (PLAsmonic nano-Textured materials and architectures FOR enhanced Molecular Sensing) of Padova University.
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