▎ 摘　　要

NOVELTY - The cathode has a metal substrate (1) i.e. copper substrate or a stainless steel substrate, whose surface is configured with a stereo microstructure array i.e. conical microstructure array, which is arranged with a carbon nanotube film layer (3). A stereo microstructure (2) of the metal substrate is configured with a graphene transition layer and the carbon nanotube film layer is configured on the graphene transition layer. USE - Carbon nanotube field emission cold cathode. ADVANTAGE - The cathode can realize better current emission capability and emission stability than the existing carbon nanotube field emission cold cathode. The stereoscopic structure on the metal surface can effectively improve electron emission of the cathode, thus improving the current emission capability of the carbon nanotube cold cathode. The metal substrate and the graphene transition layer have good thermal conductivity and electrical conductivity, which can reduce the contact resistance between the carbon nanotube and the substrate, thus improving the emission stability. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the carbon nanotube field emission cold cathode. 1Metal substrate 2Stereo microstructure 3Carbon nanotube film layer