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Spatially Controlled Fabrication of Surface-Enhanced Raman Scattering Hot Spots through Photoinduced Dewetting of SilverThin Films

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Issue Date
2022-04
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry Letters, Vol.13 No.13, pp.2969-2975
Abstract
A well-designed narrow gap between noble metal nanostructures plays aprominent role in surface-enhanced Raman scattering (SERS) to concentrate electromagneticfields at the local point, called a"hot spot". However, SERS-active substrate fabricationremains a substantial hurdle due to the high process cost and the difficulty of engineeringefficient plasmonic hot spots at the target area. In this study, we demonstrate a simplephotolithographic method for generating ultrasensitive SERS hot spots at desired positions.The solid-state dewetting of a Ag thinfilm (thickness of similar to 10 nm) using a continuous-wavelaser (similar to 1 MW/cm2) generates a closely packed assembly of hemispherical Ag nanoislands.Some of these nanoislands provide substantial plasmonic-field enhancement that is sufficientfor single-molecule detection and plasmon-catalyzed chemical reaction. Such hot spotstructures can be patterned on the substrate with a spatial resolution of better than 1 mu m. Inintegrated analytical devices, the patterned SERS hot spots can be used as position-specificchemical-sensing elements.
ISSN
1948-7185
URI
https://hdl.handle.net/10371/183705
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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