Aramid‐Assisted Acid Spinning of Continuous Multi‐Walled Carbon Nanotube Fibers for Twisted, Robust, and Multifunctional Yarns

An aramid‐assisted acid spinning strategy was developed for rapid fabrication of continuous macroscopic multi‐walled carbon nanotube (MWCNT) fibers by dispersing MWCNTs and Kevlar into most widely used concentrated sulfuric acid (>95%). The resultant fibers comprising over 85 wt% MWCNTs had a high strain rate of approximately 11.90%, and held enough mechanical strength for further twisting. The twisted three‐ply yarns maintained the high‐elastic character of single fibers (up to 13.18%), meanwhile possessed a high tensile load capacity of 360.24 mN, and a good conductivity of 154.43 S · cm−1, which were believed to have promising applications for wearable electronics, energy conversion and storage devices in harsh environments.