▎ 摘　　要

NOVELTY - Preparing graphene comprises (i) synthesizing graphene on a transition metal substrate in a vacuum environment; (ii) performing vapor deposition of specific amount of hafnium on graphene; and (iii) carrying out annealing so that hafnium covered on the surface of graphene is intercalated between graphene and the transition metal substrate to form a hafnium intercalated layer. USE - The method is useful for preparing graphene (claimed). ADVANTAGE - The graphene shows Raman spectrum line, G peak and 2D peak of typical quasi-free state graphene, and thus interaction between graphene and the metal substrate can be shielded; and exhibits intrinsic electronic properties.