Carbon Nanotube Core Graphitic Shell Hybrid Fibers

A carbon nanotube yarn core graphitic shell hybrid fiber was fabricated <i>via</i> facile heat treatment of epoxy-based negative photoresist (SU-8) on carbon nanotube yarn. The effective encapsulation of carbon nanotube yarn in carbon fiber and a glassy carbon outer shell determines their physical properties. The higher electrical conductivity (than carbon fiber) of the carbon nanotube yarn overcomes the drawbacks of carbon fiber/glassy carbon, and the better properties (than carbon nanotubes) of the carbon fiber/glassy carbon make up for the lower thermal and mechanical properties of the carbon nanotube yarn <i>via</i> synergistic hybridization without any chemical doping and additional processes