Role of residual polymer on chemical vapor grown graphene by Raman spectroscopy

Eunhye Koo; Sang Yong Ju

doi:10.1016/j.carbon.2015.01.055

Role of residual polymer on chemical vapor grown graphene by Raman spectroscopy

Eunhye Koo, Sang Yong Ju

Department of Chemistry

Research output: Contribution to journal › Article

26 Citations (Scopus)

Abstract

Abstract Although various applications extensively utilize polymer-assisted graphene transfer step, the role of residual polymer on graphene was not well-understood. Here, we report the effect of poly (methyl methacrylate) (PMMA) on chemical vapor deposition-grown hexagonal graphene via Raman spectroscopy. Analysis of bare-, PMMA-covered supported, and PMMA-covered suspended graphene exhibits that their G and 2D band positions are progressively downshifted in that order. Mapping of spatial G and 2D band shifts into doping and strain contributions shows that PMMA residue exerts moderate 0.15% tensile strain on graphene/substrate, as compared to that of bare graphene. During this tensile strain, residual PMMA-covered graphene maintains its doping level as much as bare graphene does.

Original language	English
Article number	9679
Pages (from-to)	318-324
Number of pages	7
Journal	Carbon
Volume	86
DOIs	https://doi.org/10.1016/j.carbon.2015.01.055
Publication status	Published - 2015 May 1

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)

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Koo, E., & Ju, S. Y. (2015). Role of residual polymer on chemical vapor grown graphene by Raman spectroscopy. Carbon, 86, 318-324. [9679]. https://doi.org/10.1016/j.carbon.2015.01.055

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AB - Abstract Although various applications extensively utilize polymer-assisted graphene transfer step, the role of residual polymer on graphene was not well-understood. Here, we report the effect of poly (methyl methacrylate) (PMMA) on chemical vapor deposition-grown hexagonal graphene via Raman spectroscopy. Analysis of bare-, PMMA-covered supported, and PMMA-covered suspended graphene exhibits that their G and 2D band positions are progressively downshifted in that order. Mapping of spatial G and 2D band shifts into doping and strain contributions shows that PMMA residue exerts moderate 0.15% tensile strain on graphene/substrate, as compared to that of bare graphene. During this tensile strain, residual PMMA-covered graphene maintains its doping level as much as bare graphene does.

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