Patent ID: 8173261

Claim:
Fine carbon fibrous structure which comprises carbon fibers and granular parts, wherein at least two granular parts connect by at least one of the carbon fibers; wherein the fine carbon fibrous structure have a D 2 /D 1 ratio of 1.3 to 10, wherein the D 1 is the median diameter of outer diameters of the carbon fibers and the D 2 is the area-based circle-equivalent median diameter of the particles; wherein the granular parts have a D2 of 0.05 to 0.4 μm; wherein the carbon fibers have a median length of not more than 20 μm; wherein the granular parts are produced in a growth process of the carbon fibers; and wherein at least a graphene layer which exists on and constitutes the surface of each granular part is continued on a graphene layer which exists on and constitutes the surface of the carbon fiber which connects between the granular parts.