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Coatings 2017, 7(2), 26; doi:10.3390/coatings7020026

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

SUPA (Scottish Universities Physics Alliance), Institute of Thin Films, Sensors and Imaging, School of Engineering and Computing, University of the West of Scotland, PA1 2BE Paisley, Scotland, UK
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Academic Editor: Alessandro Lavacchi
Received: 29 December 2016 / Revised: 24 January 2017 / Accepted: 6 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Recent Advances in Optical Coatings)
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Abstract

Surface Enhanced Raman Spectroscopy presents a rapid, non-destructive method to identify chemical and biological samples with up to single molecule sensitivity. Since its discovery in 1974, the technique has become an intense field of interdisciplinary research, typically generating >2000 publications per year since 2011. The technique relies on the localised surface plasmon resonance phenomenon, where incident light can couple with plasmons at the interface that result in the generation of an intense electric field. This field can propagate from the surface from the metal-dielectric interface, so molecules within proximity will experience more intense Raman scattering. Localised surface plasmon resonance wavelength is determined by a number of factors, such as size, geometry and material. Due to the requirements of the surface optical response, Ag and Au are typical metals used for surface enhanced Raman applications. These metals then need to have nano features that improve the localised surface plasmon resonance, several variants of these substrates exist; surfaces can range from nanoparticles in a suspension, electrochemically roughened electrodes to metal nanostructures on a substrate. The latter will be the focus of this review, particularly reviewing substrates made by oblique angle deposition. Oblique angle deposition is the technique of growing thin films so that the material flux is not normal to the surface. Films grown in this fashion will possess nanostructures, due to the atomic self-shadowing effect, that are dependent mainly on the deposition angle. Recent developments, applications and highlights of surface enhanced Raman scattering substrates made by oblique angle deposition will be reviewed. View Full-Text
Keywords: surface enhanced Raman spectroscopy; coatings on polymer; special substrate materials; metal coatings; deposition, characterisations and applications of sculptured and textured thin films surface enhanced Raman spectroscopy; coatings on polymer; special substrate materials; metal coatings; deposition, characterisations and applications of sculptured and textured thin films
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chu, H.O.; Song, S.; Li, C.; Gibson, D. Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications. Coatings 2017, 7, 26.

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