▎ 摘　　要

NOVELTY - A graphene nanomesh comprises a graphene sheet (100) having several pores (102) formed through it, each pore having a first diameter defined by an inner edge of the graphene sheet; and several passivation elements bonded to the inner edge of each pore, where the passivation elements having a second diameter that is less than the first diameter to decrease an overall diameter of at least one pore among the pores. USE - As graphene nanomesh for detecting chemical gas or DNA (claimed); in nanoelectronics, nanocatalysis, chemical and biological sensing. ADVANTAGE - The passivation elements having a second diameter that is less than the first diameter decrease an overall diameter of at least one pore among the several pores. The passivation element reduces the overall diameter of the nanopore. Accordingly, diameters of the nanopores can be controlled without eliminating current techniques used to form nanopores in graphene sheets. Further, nanopores having sub-nanometer diameters can be conveniently formed based on the length of the selected passivation elements that bond to the active carbon sites or on the length of the chemical compounds that bond to the passivated edges of the pores. In addition, the graphene nanomesh can be applied to a wide variety of application by conveniently forming a wide variety of functional groups at the edge of the nanopores to detect various gases and/or proteins. The chemical bonding between the active carbon sites and the passivation elements also increases the functionalization of the graphene nanomesh. The opposite end of the passivation elements selectively bonds to a first molecule while allowing a second molecule different from the first molecule to travel through the nanopore. DETAILED DESCRIPTION - A graphene nanomesh comprises a graphene sheet (100) having several pores (102) formed through it, each pore having a first diameter defined by an inner edge of the graphene sheet; and several passivation elements bonded to the inner edge of each pore, where the passivation elements having a second diameter that is less than the first diameter to decrease an overall diameter of at least one pore among the pores. An active carbon sites (104) are formed at the inner edge of each pore, and the passivation elements configured to bond to the active carbon sites. The first end of the passivation elements is configured to bond to the active carbon sites and an opposite end of the passivation elements is configured to bond to at least one molecule introduced to the graphene nanomesh to prevent at least one molecule from traveling through a nanopore. The second diameter is less than 1 nm. DESCRIPTION OF DRAWING(S) - The figure shows a top view of the graphene sheet following e-beam etching process to form an initial nanopore surrounded by active carbon sites. Graphene sheet (100) Nanopores (102) Active carbon sites (104)