fig12

Figure 12. (A) Schematic of the dip coating process. Reproduced with permission^[146], Copyright © 2024 American Chemical Society; (B) Flake-size distribution of as-synthesized (L-Ti₃C₂) and probe sonicated (S-Ti₃C₂) MXene dispersions. First coating step (fiber coating) requires using S-Ti₃C₂ MXene flakes, which enables MXene penetration into the fiber level. Second coating step (yarn coating) uses L-Ti₃C₂ MXene flakes to cover the yarn surface to provide high conductivity. Reproduced with permission^[121], Copyright © 2019 John Wiley and Sons; (C) XPS N1s core level spectra of pristine nylon fibers and MXene-coated nylon fibers. Reproduced with permission^[136], Copyright © 2020 Elsevier; (D) Schematic illustration of electrospinning procedure for MPC textiles synthesis. Reproduced with permission^[147], Copyright © 2022 Springer Nature; (E) MXene/PVDF-HFP 2.5 wt% concentration SEM images. MXene/PVDF-HFP 3.5 wt% concentration film SEM image with droplets. Reproduced with permission^[148], Copyright © 2024 Elsevier; (F) four-point probe electrical conductivity measurements of MXene/nylon nanoyarns produced with different MXene concentrations and flake sizes. Reproduced with permission^[149], Copyright © 2020 John Wiley and Sons; (G) Piezoelectric charges of undoped fiber and MPC fiber on M5 site in response to an adult’s (75 kg) toe pressing; (H) Signals profiles for gait monitoring. (G and H) are reprinted with permission from Ref.^[147], Copyright © 2022 Springer Nature; (I) Schematic of the fabrication process for BMX yarns; (J) SEM images showing the surface and cross-section morphologies of the BMX yarn containing 97.4 wt% MXene; CV curves of a freestanding aYSC device measured at (K) different potential window at a scan rate of 10 mV·s^-1 and (L) at different scan rates at 1.5 V. (I-L) are reprinted with permission from Ref.^[31], Copyright © 2018 John Wiley and Sons. XPS: X-ray photoelectron spectroscopy; MPC: MXene-enabled piezoelectric composite; PVDF: polyvinylidene fluoride; HFP: hexafluoropropylene; SEM: scanning electron microscope; BMX: biscrolled MXene/carbon nanotube yarn; CV: cyclic voltammetry; aYSC: asymmetric yarn supercapacitor; PMN: lead magnesium niobate; PT: lead titanate; CNT: carbon nanotube.