| 초록 |
We demonstrate a “direct” covalent attachment of organic molecular wedges to the edges of pristine graphite instead of graphite oxide (GO). The approach is the first case of “direct” functionalization of pristine graphite and a step toward high-yield exfoliation of three-dimensional graphite into two-dimensional graphene sheets. The resultant edge-selectively functionalized graphite is readily dispersible in common organic solvents with a concentration in the range of 0.27-0.80 mg/mL. The improved dispersibility is driven by a strong interaction between the polar functional groups on graphite and the polar solvent. The resistance of resultant graphene films upon solution cast and subsequent heat-treatments is 0.5-3 kΩ/sq with 65-95 % of optical transmittance, whose value is several orders of magnitude better than reduced GO (rGO). Our findings suggest that the edge-selectively functionalized graphite can be prepared and conveniently used as base materials for a wide range of applications from wet chemistry to device applications. |
