Multifunctional Carbon Nanotube Composite Fibers

Continuous carbon nanotube composite fibers having record energy‐to‐break (toughness) are reported. These fibers have been employed in the fabrication of lightweight fiber supercapacitors, which can be woven or sewn into fabrics and, therefore, be potentially considered as components for electronic textiles. Moreover, these fibers provided remarkable electromechanical actuator capabilities.