▎ 摘　　要

Graphene nanosheets (GS) had been solvothermally synthesized through reducing hexachloro-1,3-butadiene (C(4)Cl(6)) by metallic sodium (Na) in polyethylene glycol-600 (PEG-600) at 300 degrees C. Atomic force microscopy (AFM) and high-resolution transmission electron microscopy (HRTEM) investigations indicated that 1-3 graphite layers could be observed. The Raman spectrum showed that the peak of 2D band at 2693 cm(-1) of GS had a smaller wave number and stronger intensity compared to the 2717 cm(-1) of commercial graphitic flakes. Meanwhile, the I(D)/I(G) value of GS was 0.40 indicating a lower density of defects of GS. The possible reaction process was that C(4)Cl(6) was dechlorinated by Na in the presence of PEG-600 to produce carbon framework, then these newly produced carbon framework would connect to each other to form the hexagonal network of graphene. (C) 2011 Elsevier B.V. All rights reserved.