In this work hydrophilic and organophilic chemically modified graphene oxide (CMGO) sheets were prepared through a two-step diimide-activated amidation The hydrophilic and organophilic products were characterized by atomic force microscopy transmission electron microscopy and ultraviolet-visible spectroscopy The resulted dispersions are homogeneous and exhibit long-term stability which will facilitate the combination of CMGO sheets with polymers to yield homogeneous composites (C) 2010 Elsevier Inc All rights reserved