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A case study: Effect of defects in CVD-grown graphene on graphene enhanced Raman spectroscopy

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Title
A case study: Effect of defects in CVD-grown graphene on graphene enhanced Raman spectroscopy
Author(s)
Jong-Chul Yoon; Pradheep Thiyagarajan; Hyo-Jin Ahn; Ji-Hyun Jang
Publication Date
2015
Journal
RSC ADVANCES, v.5, no.77, pp.62772 - 62777
Publisher
ROYAL SOC CHEMISTRY
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 π-π∗ 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. © 2015 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/2170
ISSN
2046-2069
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
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