▎ 摘　　要

NOVELTY - Diffusion barrier comprises three layers namely insulating substrate (1), graphene layer (2), and copper-graphene conductive layer (3). The graphene layer is provided between the insulating substrate and copper-graphene conductive layer. USE - Diffusion barrier. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a diffusion barrier, which involves: (A) rinsing insulating substrate with deionized water and acetone in an ultrasonic cleaning device; (B) transferring the graphene into the processing substrate; (C) dissolving copper sulfate in water and adding sulfuric acid hydrochloric acid uniformly to obtain copper plating solution; (D) sonicating the prepared graphene sheet in prepared copper plating solution; and (E) drying the obtained sheet at 10-40 degrees C at 0.5-16A/dm for 1-10 minutes to obtain desired product. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a diffusion barrier. Insulating substrate (1) Graphene layer (2) Copper-graphene conductive layer (3)