▎ 摘　　要

NOVELTY - A polymer nanomesh has a planar structure having a cyclized nanomesh-forming polymer and two-dimensional holes arranged on the planar structure. USE - Polymer nanomesh is used for preparation of graphene nanomesh (claimed). ADVANTAGE - The polymer nanomesh is prepared by a simple process with high reproducibility in large scale and can easily control the band gap of the carbon nanomesh. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) carbon nanomesh having a cyclic structure of carbon atoms and two-dimensional holes arranged on the planar structure. The cyclic structure of carbon atoms comes from carbonization of a cyclized nano-mesh forming polymer; and (2) preparation of a graphene nanomesh, which involves preparing a polymer nanofilm by coating a solution of a block copolymer of a pore-forming polymer and nanomesh-forming polymer or by coating a solution of a polymer mixture of a pore-forming polymer and a nanomesh-forming polymer on a substrate, stabilizing the polymer nanofilm, removing pore-forming polymer and cyclizing the nanomesh-forming polymer to form a stabilized polymer nanomesh with pores and carbonizing the stabilized polymer nanomesh with pores to prepare a graphene nanomesh. DESCRIPTION OF DRAWING(S) - The drawing shows an exemplary view of a preparation process of graphene nanomesh.