Nanoheterostructure and method for producing the same

Patent metadata

Field	Value
Publication number	US-9914666-B2
Application number	US-201514848650-A
Country	US
Kind code	B2
Filing date	Sep 9, 2015
Priority date	Mar 18, 2010
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A nanoheterostructure includes a first inorganic component and a second inorganic component one of which is a matrix, and the other of which is three-dimensionally and periodically arranged in the matrix, and has a three-dimensional periodic structure whose average value of one unit length of a repeated structure is 1 nm to 100 nm.

First claim

What is claimed is:

1. 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/cm 3 ) 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/cm 3 ) 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,
said second step including a step of carrying out a heat treatment on the raw material solution in an inert gas atmosphere as the phase-separation treatment, the conversion treatment and the removal treatment.

2. The method for producing a nanoheterostructure according to claim 1 , wherein a solubility parameter difference between the first polymer block component and the first inorganic precursor is smaller than a solubility parameter difference between the first polymer block component and the second inorganic precursor.

3. The method for producing a nanoheterostructure according to claim 1 , wherein
a solubility parameter difference between the first polymer block component and the first inorganic precursor is smaller than a solubility parameter difference between the first polymer block component and the second inorganic precursor, and
a solubility parameter difference between the second polymer block component and the second inorganic precursor is smaller than a solubility parameter difference between the second polymer block component and the first inorganic precursor.

4. The method for producing a nanoheterostructure according to claim 1 , wherein the solubility parameter difference between the first polymer block component and the second inorganic precursor is more than 2 (cal/cm 3 ) 1/2 .

5. The method for producing a nanoheterostructure according to claim 1 , wherein
the first inorganic precursor has a solubility parameter different from that of the second polymer block component by more than 2 (cal/cm 3 ) 1/2 , and
the second inorganic precursor has a solubility parameter different from that of the first polymer block component by more than 2 (cal/cm 3 ) 1/2 .

6. The method for producing a nanoheterostructure according to claim 1 , wherein at least one of the first inorganic precursor and the second inorganic precursor has a solubility parameter different from that of the solvent by 2 (cal/cm 3 ) 1/2 or less.

7. The method for producing a nanoheterostructure according to claim 1 , further comprising, after the heat treatment in the inert gas atmosphere, any one of:
an oxidization treatment for oxidizing the first inorganic component and the second inorganic component in an oxidizing gas atmosphere; and
a reduction treatment for reducing the first inorganic component and the second inorganic component in a reducing gas atmosphere.

8. 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/cm 3 ) 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/cm 3 ) 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,
said nanoheterostructure comprising the first inorganic component and the second inorganic component one of which is a matrix, and the other of which is three-dimensionally and periodically arranged in the matrix, and
said nanoheterostructure having a three-dimensional periodic structure whose average value of one unit length of a repeated structure is 1 nm to 100 nm.

9. The method for producing a nanoheterostructure according to claim 8 , wherein the inorganic component three-dimensionally and periodically arranged in the matrix has a shape selected from the group consisting of a spherical shape, a columnar shape, and a gyroid shape.

Assignees

• Toyota Chuo Kenkyusho Kk

Inventors

• Wakayama Hiroaki
• Yonekura Hirotaka
• Tanaka Hiromitsu

Classifications

• H01F1/0063

  in a non-magnetic matrix, e.g. granular solids (granular films H01F10/007) · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C04B35/5805

  based on borides · CPC title

• C01G51/00

  Compounds of cobalt · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title