Photoreduction of SERS-Active Metallic Nanostructures on Chemically Patterned Ferroelectric Crystals
2012 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 6, no 8, 7373-7380 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
American Chemical Society (ACS) , 2012. Vol. 6, no 8, 7373-7380 p.
ferroelectrics, lithium niobate, nanofabrixcation, Raman, photochemistry
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-104098DOI: 10.1021/nn3025145ISI: 000307988900098ScopusID: 2-s2.0-84865594484OAI: oai:DiVA.org:kth-104098DiVA: diva2:563183
FunderSwedish Research Council, 622-2010-526Swedish Research Council, 621-2011-4040EU, European Research Council, PIEF-2009-234798
QC 201506242012-10-292012-10-292016-03-10Bibliographically approved