The method for producing coiled graphene / carbon nanotube composite fibers according to the present invention can provide an artificial muscle having high capacitance by setting an optimal content of graphene as a guest material, Muscles can exhibit good tensile shrinkage over the same voltage range. The composite fiber produced by the method according to the present invention can be applied to various fields for realizing similar movements to living muscles such as high-performance artificial muscles, strain sensors, reinforced exoskeleton, micro robots, soft robots, and the like.
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