Patent ID: 7794838

Claim:
A nanodisk comprising basic units aggregated in a planar direction, and having a thickness of 1 nm to 100 nm, a diameter of 10 nm to 5 μm and an aspect ratio of 1 or greater, with the basic unit being formed of two molecules of a block copolymer arranged in series in a main chain direction of the copolymer, and having a structure represented by the following formula (I): wherein ( ) represents a basic unit comprising two molecules of a block copolymer, S 1 -S 2 , arranged in series in the main chain direction; S 1 represents one block or a set of two or more blocks; S 2 represents a block different from S 1 ; . . . represents a van der Waals bond between blocks;—represents a covalent bond; . . . indicates repetition; * indicates that a van der Waals bond may be present at that position; the difference between solubility parameters of S 1 and S 2 is 2 or greater; and S 2 /(S 1 +S 2 ) is 0.3 to 0.8.