Photoreduction of SERS-active metallic nanostructures on chemically-patterned ferroelectric crystals

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Title: Photoreduction of SERS-active metallic nanostructures on chemically-patterned ferroelectric crystals
Authors: Craig Carville, N.
Manzo, Michele
Damm, Signe
Castiella, Marion
Collins, Liam
Denning, Denise
Weber, Stefan A. L.
Gallo, Katia
Rice, James H.
Rodriguez, Brian J.
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Date: 28-Aug-2012
Abstract: Photodeposition of metallic nanostructures onto ferroelectric surfaces is typically based on patterning local surface reactivity via electric field poling. Here, we demonstrate metal deposition onto substrates which have been chemically patterned via proton exchange (i.e., without polarization reversal). The chemical patterning provides the ability to tailor the electrostatic fields near the surface of lithium niobate crystals and these engineered fields are used to fabricate metallic nanostructures. The effect of the proton exchange process on the piezoelectric and electrostatic properties of the surface is characterized using voltage modulated atomic force microscopy techniques, which combined with modeling of the electric fields at the surface of the crystal, reveal that the deposition occurs preferentially along the boundary between ferroelectric and proton exchanged regions. The metallic nanostructures have been further functionalized with a target probe molecule, 4-aminothiophenol, from which surface enhanced Raman scattering (SERS) signal is detected, demonstrating the suitability of chemically patterned ferroelectrics as SERS-active templates.
Funding Details: Science Foundation Ireland
Higher Education Authority
Type of material: Journal Article
Publisher: ACS Publications
Copyright (published version): 2012 American Chemical Society
Keywords: Raman scatteringFerroelectricLithium niobateProton exchangeNanofabricationLithographyDirected assemblyDomain patterningPhotochemistryAtomic force microscopy
DOI: 10.1021/nn3025145
Language: en
Status of Item: Not peer reviewed
Appears in Collections:Physics Research Collection

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