Nanoheterostructure and method for producing the same

A method for producing a nanoheterostructure, comprising:

• a first step of preparing a raw material solution by dissolving, in a solvent,
• a block copolymer comprising at least a first polymer block component and a second polymer block component which are immiscible but linked to each other,
• a first inorganic precursor having a solubility parameter different from that of the first polymer block component by 2 (cal/cm3)1/2 or less, and
• a second inorganic precursor having a solubility parameter different from that of the second polymer block component by 2 (cal/cm3)1/2 or less;
• and
• a second step including
• a phase-separation treatment for forming a nanophase-separated structure in which at least a first polymer phase comprising the first polymer block component with the first inorganic precursor introduced thereinto and a second polymer phase comprising the second polymer block component with the second inorganic precursor introduced thereinto are regularly arranged by self-assembly,
• a conversion treatment for converting the first inorganic precursor and the second inorganic precursor to a first inorganic component and a second inorganic component, respectively, and
• a removal treatment for removing the block copolymer from the nanophase-separated structure, to thereby obtain a nanoheterostructure comprising the first inorganic component and the second inorganic component.