| http://www.w3.org/ns/prov#value | - In this way, a carbon nanotube that can emit large current electrons at a low voltage can be provided. [0279] As described, a producing method of an electron source of the present invention is a method in which a porous material with large numbers of pores is used an a support member, and carbon is deposited inside the pores of the porous material in the absence of a metal catalyst, so as to form
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