▎ 摘　　要

NOVELTY - Manufacturing (M1) a graphene-based liquid crystal fiber, comprises: (a) polymerizing a first aromatic monomer on a graphene-based compound to prepare a graphene composite in which a first aromatic polymer is surface-polymerized on the graphene-based compound; (b) wet-spinning the graphene composite to manufacture a hydrogel fiber; and (c) polymerizing a second aromatic monomer on the hydrogel fiber to fill pores of the hydrogel fiber with a second aromatic polymer. USE - The method is useful for manufacturing a graphene-based liquid crystal fiber and graphene-based carbon fiber (all claimed). ADVANTAGE - The method provides graphene-based carbon fiber with a tensile strength of greater than or equal to 300 MPa. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) manufacturing (M2) a graphene-based carbon fiber, comprising the steps (a) and (b) as per se, (c) filling pores of the hydrogel fiber with a second aromatic polymer to manufacture a graphene-based liquid crystal fiber, and (d) carbonizing the graphene-based liquid crystal fiber; (2) a graphene-based liquid crystal fiber comprising a hydrogel fiber a graphene-based compound modified with a first aromatic polymer and a second aromatic polymer filled in pores of the hydrogel fiber; and (3) a graphene-based carbon fiber comprising a graphene-based compound and graphitic nitrogen having an electrical conductivity of greater than or equal to 1x 104 S/m.