▎ 摘　　要

SP2 bonded crystal lattices structure of graphite was affected by Electron Beam Irradiation (EBI). After EBI treatment at a dose of 50 kGy, graphite flakes were further treated with sulfuric acid (H2SO4), and were characterized by Transmission Electron Microscope (TEM), X-ray Diffraction (XRD) and Raman spectroscopy. It was found that the interlayer spacing of graphite was increased and disordered easily by EBI-H2SO4 treatments, confirming successful direct exfoliation of graphite flakes. EBI-H2SO4 treated graphene exhibited higher thermal stability (weight loss of about 7.0% at 833 degrees C) caused by the better graphite structures without defects than graphene oxide (GO) which was prepared from graphite by the modified Hummer's method. (C) 2013 Elsevier B.V. All rights reserved.