| 초록 |
Graphene has emerged as a material with interesting electronic properties, and thus it has potential applications in electronics. Graphene have been prepared from graphite oxide (GO), which can be produced by oxidation in concentrated acids with oxidizing agents. GO can be easily exfoliated into graphene oxide by applying sonication. Because Graphene oxide does not possess crystalline structure of grapheme, that does not have electrical characteristics of graphene. We have reported a new approach for functionalization of carbon allotropes via “direct” electrophilic substitution reaction in a mild polyphosphoric acid (PPA)/phosphorous pentoxide (P2O5) medium. The high-yield graphene could be obtained by edge-functionalization of graphite with 4-substituted benzoic acid in PPA/P2O5. The resultant graphene displayed good dispersibility due to attachment of organic wedges. As a result, graphene films could be prepared by simple filtration and they displayed good electrical conductivity |
