Ultrastrong Graphene-Based Fibers with Increased Elongation

A new method to prepare graphene-based fibers with ultrahigh tensile strength, conductivity, and increased elongation is reported. It includes wet-spinning the mixture of GO aqueous dispersion with phenolic resin solution in a newly developed coagulation bath, followed by annealing. The introduced phenolic carbon increased densification of graphene fibers through reducing defects and increased interfacial interaction among graphene sheets by forming new C–C bonds, thus resulting in the increasing of stiffness, toughness, and conductivity simultaneously.