Carbon nanotubes(CNT)can be assembled into carbon nanotube fibers(CNTF)by floating catalytic chemical vapor deposition,but it remains challenging to effectively enhance the interaction force between carbon nanotubes and their bundles inside carbon nanotube fibers to effectively improve mechanical and electrical properties.In this study,we proposed to introduce aramid nanofibers into carbon nanotube fibers through solvent protonation to obtain high-performance carbon nanotube composite fibers.The composite fibers exhibited tensile strength of 1.23 GPa and the Young's modulus of 26.97 GPa,which were improved by 92.1％and 133.5％compared with the original carbon nanotube fibers,respectively.The specific strength and specific modulus of the composite fibers were 28.67 and 628.67 cN/dtex,which were comparable to those of high-performance fibers such as aramid fiber.In addition,the composite fibers showed good flexibility and electrical conductivity,which can be directly used as the electrode material in fiber electronic devices,showing good application potential.
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