Field Emission Properties of Graphene Edge Based on Surface Textured Substrates

Chemical vapor deposition(CVD)is a low-cost method for preparing large-area high-quality graphene, but the morphology of the grown graphene is not conducive to field emission because it is parallel to the substrate. In this paper, a method to enhance the field emission performance of graphene by laser surface texturing is proposed. A surface morphology with a certain texture is produced by laser ablation of the surface of the copper foil,and then graphene is grown on the copper foil by chemical vapor deposition. The samples were characterized and tested for field emission performance. The results show that the turn-on electric field of the graphene field emission cathode grown on the textured copper foil is reduced by 11%, and the field enhancement factor is increased by 170%. The investigation of this paper provides a new idea for improving the field emission performance of graphene.