Fig. 1.

Coaxial wet spinning of p–n segment core–shell TE fibers. a, b Schematic of the coaxial wet-spinning and post-treatment process for producing core–shell TE fibers. c The formation of hydrogen bonding and π–π interaction among MXene, PDA and SWCNT-COOH. d Nitrogen adsorption/desorption isotherm of p-segment and n-segment TE fibers. The inset displays the specific surface area (SSA) and mean pore diameter. e Comparison of density and LOI between the as-prepared p–n segment core–shell TE fibers and commercial fibers