Controllable synthesis of a novel hedgehog-like core/shell structure

► A novel hedgehog-like core/shell structure has been synthesized. ► The structure consists of vertical graphene sheets-graphene shell and copper core. ► The morphology of VGs-GS/CC can be controlled by choosing a proper deposition time. ► With increasing deposition time, graphene sheets extend from the surface of GS/CC. ► VGs-GS/CC exhibits a better electron field emission property as compared with VGs.