▎ 摘　　要

Free-standing graphene films (GFs) as functional materials require high mechanical performance for a convenient industrial processing. GFs were prepared from graphene oxide films by annealing temperatures from 1 300 to 1.700 degrees C, and were characterized by AFM, XRD, SEM, Raman spectroscopy and mechanical testing. Results indicate that the samples have a maximum tensile strength and fracture strain of 22.41 MPa and 2.44%, respectively and a minimum thermal conductivity of 744 Wm(-1).K-1 for an annealing temperature at 1 500 degrees C. This is related to physical interlocking which results, from surface wrinkles of the graphene layers.