▎ 摘　　要

Few-layers graphene is prepared by one-step liquid-phase exfoliation with carbon quantum dots (CQDs) as exfoliating agents, which is prepared by a novel electrochemical interface technology. The morphology, structure and composition of CQDs and graphene, as well as the mechanism for the realization of large-scale preparation of CQDs and graphene was proposed. The results showed that CQDs with D-50 size of 55.12 nm has excellent dispersion and exfoliation properties for graphite, and the graphene yield is as high as 97.25% (D-50 size of 3.651 mu m and 1-5 layers). Further, we successfully prepared graphene film, which has high electrical conductivity (3100.45 S/cm) and thermal conductivity (950.31 W/(m.K)) after graphitization.