▎ 摘　　要

Large-area freestanding graphene films are facilely fabricated by reducing graphene oxide films on recyclable Cu foils in H-2-containing atmosphere at high temperature. Cu might act as efficient catalysts for considerably improved reduction of graphene oxide according to the SEM, EDS, XRD, XPS, Raman and TGA results. Comparing to the graphene films with similar to 30 mu m thickness reduced without Cu substrate at 900 degrees C, the thermal conductivity and electrical conductivity of graphene films reduced on Cu foils are enhanced about 140% to 902 Wm(-1)K(-1) and 3.6 x 10(4) S/m, respectively. Moreover, the graphene films demonstrate superior thermal conductivity of similar to 1219 Wm(-1)K(-1) as decreasing the thickness of films to similar to 10 mu m. The graphene films also exhibit excellent mechanical properties and flexibility.