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

Eunhye Koo, Sang Yong Ju

Research output: Contribution to journalArticle

22 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 languageEnglish
Article number9679
Pages (from-to)318-324
Number of pages7
JournalCarbon
Volume86
DOIs
Publication statusPublished - 2015 May 1

Fingerprint

Graphite
Graphene
Raman spectroscopy
Polymers
Vapors
Polymethyl Methacrylate
Polymethyl methacrylates
Tensile strain
Doping (additives)
Chemical vapor deposition
Substrates

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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title = "Role of residual polymer on chemical vapor grown graphene by Raman spectroscopy",
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.",
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Role of residual polymer on chemical vapor grown graphene by Raman spectroscopy. / Koo, Eunhye; Ju, Sang Yong.

In: Carbon, Vol. 86, 9679, 01.05.2015, p. 318-324.

Research output: Contribution to journalArticle

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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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