Preparation of graphene fibers by wet spinning and fiber characterization

In order to prepare graphene fiber with both conductivity and flexibility, the soluble graphene oxide was prepared through modified Hummers method. The graphene oxide solution was used as the spinning solution, and the CaCl2 ethanol solution as the coagulation bath. The graphene fiber was obtained by hydroiodic reduction via wet spinning. The fiber was treated with carboxymethylcellulose as cross-linking agent to obtain cross-linked graphene fiber for comparison. The surface morphology, electrical conductivity and mechanical properties of the two graphene fibers were characterized for preliminary applications. The results show that the prepared graphene oxide fiber has an oxygen content of 31.37% and a monolayer thickness of 0.88 nm. Besides, the surfaces of the two types of graphene fibers are smooth, but the inner layers of the cross-linked graphene fiber are arranged more closely with the conductivity of 124 S/cm, which is similar to the conductivity of the graphene fiber before crosslinking. However, the tensile strength is significantly increased from 120 MPa to 179 MPa after crosslinking. The single cross-linked graphene fiber can be used as a circuit wire to light the bulb, and can be arbitrarily bent and knotted to form a petal and a plain mesh structure. Copyright No content may be reproduced or abridged without authorization.