▎ 摘　　要

The current investigation showed that oxidation of graphite with low concentration KMnO4 led to formation of edge-oxidized graphite (EOG) which preserved high crystalline graphitic structure on the basal planes while the edges were functionalized by oxygen-containing groups. Medium and short-time sonication of EOG in water using sodium cholate (SC) as a stabilizer could yield edge-oxidized graphene nanosheets (EOGNs) dispersion at a concentration of up to 0.59 mg/ml. This dispersion was stable at room temperature for more than 6 months. Later, the prepared EOGNs dispersion was used to produce transparent conducting EOGN films by vacuum filtration method. The resulting thin films are uniform and exhibit a transparency of similar to 85% at 550 nm and a sheet resistance of similar to 26.44 k Omega/square. Moreover, the prepared EOG was found to be dispersible in a wider variety of solvents than GO (graphite oxide), which verifies wider application fields for EOG compared to GO. These results open up new possibilities for preparation of graphene dispersions with insignificant defects. (C) 2015 Elsevier B.V. All rights reserved.