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特許 権利維持 PROBLEM TO BE SOLVED: To provide a novel micro/nano structure which can be expected to be used in FED and the like, and its manufacturing method using self-organizing. ; SOLUTION: The micro/nano structure is a nanotube which is hollow, is composed of a copper oxide, has an aspect ratio, which is a ratio of a length to an outer diameter, of not less than 1.5, and exhibits semiconductor characteristics.