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Photoreduction of SERS-active metallic nanostructures on chemically-patterned ferroelectric crystals
Date Issued
2012-08-28
Date Available
2013-04-08T15:41:56Z
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.
Sponsorship
Science Foundation Ireland
Higher Education Authority
Other Sponsorship
This publication has emanated from research conducted with the financial support of the Higher Education Authority PRTLI-5 (DGPP and NANOREMEDIES), Science Foundation Ireland (SFI10/RFP/MTR2855), and UCD Research. This work was also supported by the Swedish Scientific Research Council (VR 622-2010-526 and 621-2011-4040) and the ADOPT Linné Center. The authors are grateful to COST actions MP0702 (STSM 8171) and MP0904. S.A.L. Weber acknowledges support from the Alexander von Humboldt Foundation.
Type of Material
Journal Article
Publisher
ACS Publications
Journal
Acs Nano
Volume
6
Issue
8
Start Page
7373
End Page
7380
Copyright (Published Version)
2012 American Chemical Society
Language
English
Status of Item
Not peer reviewed
This item is made available under a Creative Commons License
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Name
2012_Carville_ACS_Nano_Repository_Version.pdf
Size
757.98 KB
Format
Owning collection
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60
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