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Keywords:

  • graphene;
  • chemical functionalization;
  • methylation;
  • photochemistry
Thumbnail image of graphical abstract

Covalent grafting of methyl groups onto the basal plane of graphene is achieved through a photochemical reaction between graphene and di-tert-butyl peroxide. The methylation of graphene is found to be reversible. The edge of single-layer graphene shows the largest methylation reactivity, which provides a route to tailor the edge state of graphene.