Abstract: MXene fibers, as a novel material form derived from MXene, demonstrate exceptional specific strength, flexibility, durability, and multifunctionality. However, pure MXene fibers are still constrained by major challenges, including limited assembly techniques, molding difficulties, disordered MXene alignment, and void formation. Thus, researchers have increasingly turned to MXene composite fibers, incorporating various functional materials to enhance their manufacturability and properties. This review presents a thorough review of current advancements in high-performance MXene composite fibers. Firstly, the principles of various methods used to synthesize MXene composite fibers were introduced, followed by a discussion of their advantages and disadvantages. Subsequently, the progress in combining MXene with functional materials to prepare composite fibers, such as carbon nanomaterials (e.g., graphene and carbon nanotubes), metal nanomaterials (e.g., metal nanoparticles, metal nanowires/nanorods, and metal nanosheets), and polymers (e.g., conducting polymers, biopolymers, aramids, and polyurethanes), is summarized in detail. The effects of various functional materials on the structure and properties of MXene fibers are thoroughly analyzed. Finally, the applications of MXene composite fibers are described comprehensively. Challenges and application prospects surrounding the development of MXene composite fibers are proposed in this review. This paper aims to accelerate the progress of MXene fiber research and facilitate their transition from laboratory exploration to widespread practical applications.

Key words: Mxene, Composite fibers, Fabrications, Properties, Applications