▎ 摘　　要

NOVELTY - A substrate is electroconductive substrate on which hybrid coating of graphene and/or graphene oxide layers (4) and carbon nanotubes (1) is formed. Carbon nanotubes are largely bound on the graphene and/or graphene oxide layer surfaces. USE - Substrate is used in X-ray tubes for computer tomography, mammography and/or security plants (all claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of electroconductive coating of substrate. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of graphene and/or graphene oxide layer structure on substrate. Carbon nanotubes (1) Graphene and/or graphene oxide layer (4) Emitter edges or emitter combing (6) Valley (7)