| 초록 |
Exfoliation of three-dimensional graphite into two-dimensional graphene and/or graphene-like sheets has attracted a lot of attention, because graphene has many potential applications due to its peculiar properties. We studied a new approach to chemical exfoliation of graphite by grafting organic molecular wedges to the defect sites (mostly sp2C-H) located mainly on the edges of graphite via electrophilic substitution reaction. Edge-functionalized graphite (EFG) is prepared via a “direct” covalent attachment of organic molecular wedges in poly(phosphoric acid) (PPA)/phosphorous pentoxide (P2O5) medium. The EFG is readily dispersible in N-methyl-2-pyrrolidone with a concentration as high as 0.27 mg/mL, leading to high-yield exfoliation of the three-dimensional graphite into two-dimensional graphene-like sheets. |
