▎ 摘　　要

NOVELTY - Polydopamine-coated graphene composite fiber comprises polydopamine-coated graphene-based fibers, where polydopamine is coated on surface of graphene and metal and/or metal compound nanoparticles are uniformly dispersed in surface of polydopamine-coated graphene-based fibers. USE - Polydopamine-coated graphene composite fiber. ADVANTAGE - The polydopamine-coated graphene composite fiber has excellent mechanical strength, electrical conductivity, good flexibility, and wide range of applications in flexible, portable and wearable devices. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing polydopamine-coated graphene composite fiber, which involves: (A) coating graphene oxide in situ to obtain polydopamine-coated graphene oxide as assembly unit; (B) taking solution of polydopamine-coated graphene oxide as raw material, and preparing macroscopic polydopamine-coated graphene oxide fibers by wet spinning process; and (C) subjecting polydopamine-coated graphene oxide fibers to hydrothermal reaction conditions to obtain metal oxide or hydroxide loaded polydopamine graphene composite fiber, or immersing obtained polydopamine-coated graphene oxide fibers in silver nitrate or chlorauric acid solution yields corresponding polydopamine-grafted graphene composite fiber loaded with silver or gold nanoparticles.