▎ 摘　　要

NOVELTY - The method involves providing a graphene sheet on a support substrate e.g. silicon dioxide or glass substrate. A film of plasmonic material is formed on the graphene sheet. The graphene sheet is heated with the film of plasmonic material to form a plasmonic graphene comprising graphene with plasmonic nanostructures. The graphene sheet is formed on a copper substrate using chemical vapor deposition. A polymethylmethacrylate layer is spin-coated onto the graphene sheet. The copper substrate is removed by contacting the copper substrate with iron chloride solution. USE - Method for forming a plasmonic graphene of a photovoltaic device and a photodetector (all claimed). ADVANTAGE - The method enables enhancing plasmonic effect of light trapping to tune plasmonic resonance frequency to right value and to minimize Ohmic loss on the particle surface. The method enables forming the nanostructures in disk-like shape for photovoltaic applications in order to minimize loss and damage to the graphene. DETAILED DESCRIPTION - The plasmonic material is selected from a group consisting of silver, gold and copper. INDEPENDENT CLAIMS are also included for the following: (1) a plasmonic graphene (2) a photovoltaic device (3) a photodetector. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an ionic liquid gated graphene with plasmonic nanostructures on a silicon substrate.