| http://www.w3.org/ns/prov#value | - In this way, field emission of a yet lower voltage driving electron source can be controlled. [0119] The producing method of the carbon nanotube of the present invention is a method in which carbon is deposited inside the pores of a porous material with large numbers of pores, so as to form a carbon deposition film of a cylindrical shape, wherein the method includes: the anodic oxidation step for
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