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UV/Ozone-Oxidized Large-Scale Graphene Platform with Large Chemical Enhancement in Surface-Enhanced Raman Scattering

Cited 261 time in Web of Science Cited 275 time in Scopus
Authors
Huh, Sung; Park, Jaesung; Kim, Young Soo; Kim, Kwang S.; Hong, Byung Hee; Nam, Jwa-Min
Issue Date
2011-12
Citation
ACS Nano, Vol.5 No.12, pp.9799-9806
Keywords
grapheneoxidized grapheneozonesurface-enhanced Raman scatteringchemical enhancement
Abstract
We fabricated a highly oxidized large-scale graphene platform using chemical vapor deposition (CVD) and UV/ozone-based oxidation methods. This platform offers a large-scale surface-enhanced Raman scattering (SERS) substrate with large chemical enhancement in SERS and reproducible SEAS signals over a centimeter-scale graphene surface. After UV-induced ozone generation, ozone molecules were reacted with graphene to produce oxygen-containing groups on graphene and induced the p-type doping of the graphene. These modifications introduced the structural disorder and defects on the graphene surface and resulted in a large chemical mechanism-based signal enhancement from Raman dye molecules [rhodamine B (RhB), rhodamine 6G (R6G), and crystal violet (CV) in this case] on graphene. Importantly, the enhancement factors were increased from similar to 10(3) before ozone treatment to similar to 10(4), which is the largest chemical enhancement factor ever on graphene, after 5 min ozone treatment due to both high oxidation and p-doping effects on graphene surface. Over a centimeter-scale area of this UV/ozone-oxidized graphene substrate, strong SERS signals were repeatedly and reproducibly detected. In a UV/ozone-based micropattern, UV/ozone-treated areas were highly Raman-active while nontreated areas displayed very weak Raman signals.
ISSN
1936-0851
URI
https://hdl.handle.net/10371/172122
DOI
https://doi.org/10.1021/nn204156n
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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