Patent ID: 7700064
Filing Date: 2010-04-20
Classification: D01F,Y10T

Abstract:
1. A single carbon solid fiber which has (1) a metal element content of no more than 50 ppm and (2) a fiber diameter of 0.001 to 2 μm and (3) substantially no branched structure which is seen through an electron microscope, wherein the half-value width of the Raman band at 1,580 cm wherein the R value defined by the following equation measured by Raman spectroscopy of the exterior surface of the carbon fiber is 0.08 to 0.2, wherein streak-like irregularities extending in the fiber axial direction are existent on the exterior surface of the fiber, wherein the ratio (L/D) of the fiber length (L) to the fiber diameter (D) is 2 to 1.000, wherein the carbon fiber is made up of graphite which is composed of a plurality of graphenes and the graphenes are bonded together by a carbon bridge at the end of the carbon fiber, wherein the graphene surface of a graphite layer is oriented in the fiber axial direction, wherein the distance (d