▎ 摘　　要

NOVELTY - A single-layer graphene sheet comprises deficiency defect and/or reconstruction structure defect of carbon and enolate coupling structure, epoxy bond structure and/or ether bond structure formed in the defect, and sheet resistance of less than or equal to 700 Omega /square. The ratio ID/IG of the strength of D-band to the strength of G-band in the Raman spectrum of 0.2. USE - A single-layer graphene sheet used for chemical sensor (claimed). ADVANTAGE - The single-layer graphene sheet has a large number of defects and maintains excellent conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for treating the single-layer graphene sheet monolayer which involves preparing graphene sheet, irradiating single-layer graphene sheet with UV rays in oxygen gas or argon-oxygen mixed gas; and forming carbon deficiency defect and/or construction structural defect, and enolate coupling structure, epoxy bond structure and/or epoxy bond structure, and/or epoxy bond structure and/or oxygen gas mixture in the defect and/or forming ether bond structure.