▎ 摘　　要

NOVELTY - A nitrogen-doped graphene SiO2 coaxial nanotube field-emission cathode, nitrogen-doped graphene comprising a conductive substrate, grown on a substrate of @ SiO2 coaxial nano-tube. The solution provides the graphene doped with nitrogen @ SiO2 centre layer of the coaxial graphene nano-tube is nano-tube, its diameter is 150 to 250nm, the outer layer is a SiO2 coating, the thickness is 6 to 8nm, the nitrogen atom percentage content is 3.2at%. synergistic effect the structure comprehensively considers the one-dimensional tubular structure, the N element is doped with other material and composite factors for improving field emission performance of graphene, the graphene doped with nitrogen @ SiO2 coaxial nanotube field-emission cathode, exhibit excellent field emission performance, suitable for field emission flat panel displays, vacuum electronic devices, an electron source of a large screen LCD backlight module and field emission lighting source.