fig9

Figure 9. (A) Structural schematic diagram of MXene. Reproduced with permission^[112], Copyright © 2021 The American Association for the Advancement of Science; (B) Comparison of effective Young’s moduli for several 2D materials: GO, rGO, MoS₂, h-BN, and graphene. Reproduced with permission^[113], Copyright © 2018 The American Association for the Advancement of Science; (C) Schematic illustrating the fabrication of core–shell ANF@M fiber by coaxial wet spinning, the evolution of the sheet orientation, and the cross-linking of MXene sheets with ammonium ions. Reproduced with permission^[114], Copyright © 2022 Springer Nature; (D) D-spacing and porosity of pure fiber when heated; (E) Orientation order of COC fibers at different draw-down ratios shown by WAXS patterns (inset). (D and E) are reprinted with permission from Ref.^[34], Copyright © 2023 John Wiley and Sons; (F) Cross-sectional SEM images of an anti-plane in deer antlers and PPM fibers; (G) Comparison of the tensile strength, toughness, and ductility of PPM fibers with porosities of 28.5%, 20.8%, 16.2%, and 11.8%. (F and G) are reprinted with permission from Ref.^[35], Copyright © 2025 Springer Nature; (H) The value of ΔR/R₀ changes with strain during the stretching process of MCSFs. The inserted SEM images are corresponding surface morphologies at different stages. Reproduced with permission^[58], Copyright © 2025 John Wiley and Sons; (I) In situ EELS spectra of the O K-edge of Mo₂TiC₂T_x; (J) Comparison of the post-anneal RT resistance (black circles) with the concentration of =O (red squares), given in units of x based on the chemical formula Mo₂TiC₂O_x. (I and J) are reprinted with permission from Ref.^[115], Copyright © 2019 Springer Nature; (K) SEM images of Ti₃C₂T_x MXene fiber. Reproduced with permission^[116], Copyright © 2020 Springer Nature; (L) specific areal capacitance of the BMX yarn electrodes from the GCD curves. Reproduced with permission^[31], Copyright © 2018 John Wiley and Sons; (M) CV curves of M7P3 fiber at different scan rates. Reproduced with permission^[32], Copyright © 2019 John Wiley and Sons. GO: Graphene oxide; rGO: reduced graphene oxide; h-BN: hexagonal boron nitride; ANF: aramid nanofiber; COC: cyclic olefin copolymer; WAXS: wide-angle X-ray scattering; SEM: scanning electron microscope; PPM: polypropylene microfiber; MCSFs: MXene induced conductive silk fibers; EELS: electron energy loss spectroscopy; RT: room temperature; BMX: biscrolled MXene/carbon nanotube yarn; GCD: galvanostatic charge-discharge; CV: cyclic voltammetry; GF: graphene fiber.