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장지현

Jang, Ji-Hyun
Structures & Sustainable Energy Lab.
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A case study: effect of defects in CVD-grown graphene on graphene enhanced Raman spectroscopy

Author(s)
Yoon, Jong-ChulThiyagarajan, PradheepAhn, Hyo-JinJang, Ji-Hyun
Issued Date
2015-07
DOI
10.1039/c5ra11100e
URI
https://scholarworks.unist.ac.kr/handle/201301/16552
Fulltext
http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA11100E#!divAbstract
Citation
RSC ADVANCES, v.5, no.77, pp.62772 - 62777
Abstract
Graphene-enhanced Raman spectroscopy (GERS) is a technique to increase the Raman scattering of adsorbed probe molecules on graphene. Here we systematically explore the effect of the method used to transfer the CVD-grown graphene onto another substrate on Raman scattering. We have found that graphene transferred using poly methyl methacrylate (PMMA) produces 6 times the Raman scattering signal increase of that produced by graphene transferred using thermal release tape. The reason for this is that PMMA-assisted graphene contains a larger amount of defects such as carboxyl and hydroxyl groups that help the attachment of probe molecules to the graphene surface, leading to improved pi-pi* interactions and thus easier charge transfer between the probe molecules and graphene. Our results indicate the need for a much closer look at the functional groups of graphene which are different for the two transfer methods
Publisher
ROYAL SOC CHEMISTRY
ISSN
2046-2069
Keyword
ELECTROCHEMICAL DELAMINATIONEPITAXIAL GRAPHENERHODAMINE 6GOXIDESURFACESCATTERINGFILMSDNAINTENSITYSHEETS

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