▎ 摘　　要

NOVELTY - Graphene fiber (34B) comprises a graphene film (35) formed into an elongated fiber-like shape and having amine groups formed on at least an outer surface (48) of the graphene film and epoxide groups formed on at least one edge of the graphene film. USE - The graphene fiber is useful in a composite material (claimed) such as aerospace composites and for forming prepreg materials. ADVANTAGE - The graphene fiber provides composite material with increased strength, stiffness and modulus, and improved mechanical and electrical properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a composite material comprising the graphene fiber, and a matrix material; and (2) increasing strength of a composite material, comprising forming a graphene fiber comprising a graphene film formed into an elongated fiber-like shape and having amine groups formed on at least an outer surface of the graphene film and epoxide groups formed on at least one edge of the graphene film, combining a resin matrix material with many of the graphene fibers to form a prepreg material, and curing the prepreg material to form the composite material. DESCRIPTION OF DRAWING(S) - The figure shows an illustration of the graphene fiber. Graphene fiber (34B) Graphene film (35) Roll (43) Second edge (46) Outer surface of functionalized graphene film (48)