Ultrathin carbon fibers

摘要

An ultrathin carbon fiber having two or more tubular graphene sheets layered is disclosed. The tubular graphene sheets has a polygonal cross section in a direction substantially orthogonal to the axis of the ultrathin carbon fibers, a diameter of the fiber is 15 to 100 nm, an aspect ratio of the carbon fiber is not more than 10⁵, and I_D/I_G of the carbon fiber as determined by Raman spectroscopy is not more than 0.2.