Oxygen Intercalation of Graphene on Transition Metal Substrate: An Edge-Limited Mechanism

Liang Ma, Xiao Cheng Zeng, Jinlan Wang

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Oxygen intercalation has been proven to be an efficient experimental approach to decouple chemical vapor deposition grown graphene from metal substrate with mild damage, thereby enabling graphene transfer. However, the mechanism of oxygen intercalation and associated rate-limiting step are still unclear on the molecular level. Here, by using density functional theory, we evaluate the thermodynamics stability of graphene edge on transition metal surface in the context of oxygen and explore various reaction pathways and energy barriers, from which we can identify the key steps as well as the roles of metal passivated graphene edges during the oxygen intercalation. Our calculations suggest that in well-controlled experimental conditions, oxygen atoms can be easily intercalated through either zigzag or armchair graphene edges on metal surface, whereas the unwanted graphene oxidation etching can be suppressed. Oxygen intercalation is, thus, an efficient and low-damage way to decouple graphene from a metal substrate while it allows reusing metal substrate for graphene growth.

Original languageEnglish (US)
Pages (from-to)4099-4105
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume6
Issue number20
DOIs
StatePublished - Oct 15 2015

Keywords

  • ab initio calculation
  • decoupling and transfer
  • graphene edge
  • oxygen intercalation
  • transition metal catalyst

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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