▎ 摘　　要

NOVELTY - Graphene oxide whose edges are oxidized and delaminated with oxygen atoms, is claimed. USE - The graphene oxide is useful in display device (claimed). ADVANTAGE - The graphene oxide utilized as a thin film having excellent transmittance and electrical conductivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) producing graphene oxide, comprising (a) dispersing graphite in a container containing concentrated sulfuric acid and injecting water, (b) adding potassium permanganate to the container to oxidize the graphite, (c) adding hydrogen peroxide to the container to terminate oxidation and then washing to obtain oxidized graphite having an edge, and (d) delaminating the obtained graphite to obtain graphene oxide having oxidized edges; and (2) display device comprising a substrate, a thin film transistor disposed on the substrate and including an active layer, a gate electrode, a source electrode, and a drain electrode, and a pixel electrode connected to the thin film transistor, and including graphene oxide whose edges are oxidized and delaminated with oxygen atoms.