▎ 摘　　要

NOVELTY - Producing graphene fiber, comprises (a) preparing first solution including graphene oxide, (b) spinning the first solution with second solution including hetero-element to produce oxidized graphene fibers, (c) separating, washing and drying the oxidized graphene fibers to obtain oxidized graphene fibers, and (d) treating the oxidized graphene fiber by thermal treatment to prepare graphene fiber doped with hetero-element. The degree of orientation of graphene in the graphene fiber is controlled according to the concentration and the spinning speed of the first solution. USE - The method is useful for producing graphene fiber (claimed). ADVANTAGE - The graphene fiber has excellent mechanical strength, electrical conductivity characteristics, high tensile modulus and elongation.