▎ 摘　　要

NOVELTY - Preparing graphene fibers comprises (a) carrying out microfluidic spinning of graphene oxide aqueous solution using microfluidic chip to obtain graphene oxide fibers, where the microfluidic chip includes an internal phase channel containing graphene oxide aqueous solution and an external phase channel containing coagulation liquid, and the internal phase channel comprises an internal phase A channel outlet, and is in fluid contact with external phase channel through internal phase channel outlet, passing graphene oxide aqueous solution and coagulation solution into internal and external phase channel, allowing graphene oxide aqueous solution to flow into external phase channel through internal phase channel outlet, and coagulate under the action of coagulation liquid to obtain graphene oxide fiber, and (b) reacting the graphene oxide fiber under the action of reducing agent at 90 degrees C to obtain the product. USE - The method is useful for preparing graphene fibers. ADVANTAGE - The method: can control graphene fibers by using microfluidic process, and can prepare graphene fibers with an ordered microstructure arrangement, good mechanical properties and good continuous properties. DETAILED DESCRIPTION - Preparing graphene fibers comprises (a) carrying out microfluidic spinning of graphene oxide aqueous solution using microfluidic chip to obtain graphene oxide fibers, where the microfluidic chip includes an internal phase channel containing graphene oxide aqueous solution and an external phase channel containing coagulation liquid, and the internal phase channel is provided with an internal phase A channel outlet, and is in fluid contact with external phase channel through internal phase channel outlet, and the ratio of internal diameter of internal phase channel to that of outlet is 3:1-2, passing graphene oxide aqueous solution and coagulation solution into internal and external phase channel, allowing graphene oxide aqueous solution to flow into external phase channel through internal phase channel outlet, and coagulate under the action of coagulation liquid to obtain graphene oxide fiber, where the ratio of flow rate of graphene oxide aqueous solution to coagulation solution is 1:4-6, and (b) reacting the graphene oxide fiber under the action of reducing agent at 90 degrees C to obtain the product.