| http://www.w3.org/ns/prov#value | - A carbon substance comprising: a structure having a diameter ranging from about 1 micron to about 100 microns and including carbon and a metal or a metallic oxide; and a plurality of line-shaped bodies whose diameters are smaller than about 200 nm, wherein the line-shaped bodies include carbon as a main component thereof and grow radially from a surface of the structure; and wherein the structure
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