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US-12617993-B2 - Structure body, device, and method for manufacturing structure body

US12617993B2US 12617993 B2US12617993 B2US 12617993B2US-12617993-B2

Abstract

A structure body includes a free-standing structure including a fibrous member and/or a shell. The fibrous member and/or a shell are each a layered body formed of at least one light-absorbing layer and at least one dielectric layer. The light-absorbing layer includes a light-absorbing material that has an absorption in a visible light region, and the dielectric layer includes a dielectric material. The fibrous member and/or the shell have a three-dimensionally continuous configuration.

Inventors

  • Atsushi BENIYA
  • Shougo Higashi

Assignees

  • KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO

Dates

Publication Date
20260505
Application Date
20220114
Priority Date
20210518

Claims (20)

  1. 1 . A structure body comprising a free-standing structure including at least one of a fibrous member or a shell, the at least one of the fibrous member or the shell being a layered body formed of at least one light-absorbing layer and at least one dielectric layer, the at least one light-absorbing layer and the at least one dielectric layer being in contact with each other, and the at least one of the fibrous member or the shell having a three-dimensionally continuous configuration, the at least one light-absorbing layer including a light-absorbing material that has an absorption in a visible light region, and the at least one dielectric layer including a dielectric material.
  2. 2 . The structure body according to claim 1 , wherein the light-absorbing material is metal nanoparticles containing at least one of Au, Ag, Cu, or Al.
  3. 3 . The structure body according to claim 1 , wherein the dielectric material is at least one of Cu 2 O, TiO 2 , Fe 2 O 3 , SiO 2 , Si, or Ge.
  4. 4 . The structure body according to claim 1 , wherein the light-absorbing material is metal nanoparticles having a diameter of 1 nm or greater and 60 nm or less.
  5. 5 . The structure body according to claim 1 , wherein the at least one dielectric layer has a single layer thickness of 5 nm or greater and 70 nm or less.
  6. 6 . The structure body according to claim 1 , wherein the layered body includes light-absorbing layers and dielectric layers that are alternately disposed, the light-absorbing layers are two or more and four or fewer layers identical to the at least one light-absorbing layer, and the dielectric layers are two or more and four or fewer layers identical to the at least one dielectric layer.
  7. 7 . The structure body according to claim 1 , wherein the layered body includes light-absorbing layers and dielectric layers that are alternately disposed, the light-absorbing layers are three layers identical to the at least one light-absorbing layer, and the dielectric layers are three layers identical to the at least one dielectric layer.
  8. 8 . The structure body according to claim 1 , wherein the light-absorbing material is nanoparticles containing Ag, and the dielectric material is Cu 2 O.
  9. 9 . The structure body according to claim 1 , wherein, in the layered body, a total thickness of the at least one light-absorbing layer is 5 nm or greater and 20 nm or less, and a total thickness of the at least one dielectric layer is 20 nm or greater and 70 nm or less.
  10. 10 . The structure body according to claim 1 , wherein the structure body has a sheet shape and has a weight per cm 2 of 15 μg or greater and 60 μg or less.
  11. 11 . The structure body according to claim 1 , wherein the layered body is a semi-tubular nanowire having a diameter of less than or equal to 500 nm.
  12. 12 . The structure body according to claim 1 , wherein the free-standing structure is a flexible nonwoven fabric structure including the layered body, and the layered body is a semi-tubular nanowire and has a three-dimensionally continuous configuration.
  13. 13 . A device comprising the structure body according to claim 1 , the structure body serving as a photothermal conversion material that absorbs visible light and converts the visible light into heat.
  14. 14 . The device according to claim 13 , further comprising a support body that has a liquid absorbing property and a thermal insulation property, a first surface of the support body being in contact with the structure body, a second surface of the support body being to be in contact with a liquid, wherein the device is a device that evaporates the liquid by using the heat converted by the structure body.
  15. 15 . A method for manufacturing a structure body, the method comprising: a forming step including forming a layered body on a surface of a substrate that includes a polymer, to form a free-standing structure including at least one of a fibrous member or a shell, the layered body being formed of at least one light-absorbing layer and at least one dielectric layer, the at least one light-absorbing layer and the at least one dielectric layer being in contact with each other, the at least one light-absorbing layer including a light-absorbing material that has an absorption in a visible light region, the at least one dielectric layer including a dielectric material, the at least one of the fibrous member or the shell being the layered body and having a three-dimensionally continuous configuration; and a removing step including removing all or a portion of the substrate.
  16. 16 . The method for manufacturing a structure body according to claim 15 , wherein, in the forming step, a nonwoven fabric or a porous membrane is used as the substrate.
  17. 17 . The method for manufacturing a structure body according to claim 15 , wherein, in the forming step, the at least one light-absorbing layer is formed to include, as the light-absorbing material, nanoparticles containing at least one of Au, Ag, Cu, or Al.
  18. 18 . The method for manufacturing a structure body according to claim 15 , wherein, in the forming step, the at least one dielectric layer is formed to include, as the dielectric material, at least one of Cu 2 O, TiO 2 , Fe 2 O 3 , SiO 2 , Si, or Ge.
  19. 19 . The method for manufacturing a structure body according to claim 15 , wherein, in the forming step, the layered body is formed by using physical vapor deposition.
  20. 20 . The method for manufacturing a structure body according to claim 15 , wherein, in the forming step, light-absorbing layers and dielectric layers are alternately formed, the light-absorbing layers being two or more and four or fewer layers identical to the at least one light-absorbing layer, the dielectric layers being two or more and four or fewer layers identical to the at least one dielectric layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present specification discloses a structure body, a device, and a method for manufacturing a structure body. 2. Description of the Related Art Examples of structure bodies disclosed in the related art include a material including an alumina porous body having an inner wall coated with Au nanoparticles (see Non-Patent Literature 1, for example), a material including graphene that has been shape-controlled to be a porous body (see Non-Patent Literature 2, for example), and a material including a free-standing structure including at least one of a fibrous member and a shell, the at least one of the fibrous member and the shell including at least one of Ag and Cu and having a three-dimensionally continuous configuration (see Patent Literature 1, for example). For example, these structure bodies can be used for absorbing visible light and converting the visible light into heat and for evaporating a liquid with the converted heat. CITATION LIST Patent Literature PTL 1: WO 2019/049996 Non Patent Literature Citation 1: Zhou L, et al. Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation. Science Advances2, e1501227 (2016)Citation 2: Ren H, et al. Hierarchical Graphene Foam for Efficient Omnidirectional Solar, Thermal Energy Conversion. Advanced Materials 29, 1702590 (2017) SUMMARY OF THE INVENTION Unfortunately, the structure bodies of Non-Patent Literature 1 and 2 had a relatively large thickness and weight, which was necessary for increasing an absorbance, and, therefore, in these structure bodies, it sometimes took a long time for heating due to light absorption to be accomplished. Furthermore, in the structure body of Patent Literature 1, heating due to light absorption was accomplished quickly compared with the structure bodies of Non-Patent Literature 1 and 2; however, further acceleration of heating due to light absorption has been desired. The present disclosure has been made in view of the above-described problems, and a principal object of the present disclosure is to provide a structure body, a device, and a method for manufacturing a structure body in which heating due to light absorption can be accelerated. The present inventors diligently performed studies to achieve the object described above and found that a structure body in which heating due to light absorption can be accelerated can be obtained as follows: a light-absorbing material and a dielectric material are formed on a surface of a nonwoven fabric or a porous membrane, which, is used as a substrate, and thereafter, the substrate is removed. Accordingly, a structure body, a device, and a method for manufacturing a structure body of the present disclosure were completed. Specifically, a structure body of the present disclosure includes a free-standing structure including at least one of a fibrous member or a shell. The at least one of a fibrous member or a shell is a layered body formed of at least one light-absorbing layer and at least one dielectric layer. The at least one light-absorbing layer includes a light-absorbing material that has an absorption in a visible light region, and the at least one dielectric layer includes a dielectric material. The at least one of a fibrous member or a shell has a three-dimensionally continuous configuration. A device of the present disclosure includes the structure body described above. The structure body serves as a photothermal conversion material that absorbs visible light and converts the visible light into heat. A method of the present disclosure for manufacturing a structure body includes a forming step and a removing step. The forming step includes forming a layered body on a surface of a substrate that includes a polymer, to form a free-standing structure including at least one of a fibrous member or a shell, the layered body being formed of at least one light-absorbing layer and at least, one dielectric layer, the at least one light-absorbing layer including a light-absorbing material that has an absorption in a visible light region, the at least one dielectric layer including a dielectric material, the at least one of a fibrous member or a shell being the layered body and having a three-dimensionally continuous configuration. The removing step includes removing all or a portion of the substrate. The present disclosure can provide a structure body, a device, and a method for manufacturing a structure body in which heating due to light absorption can be further accelerated. Presumably, a reason for this is as follows. For example, in an instance where a metal is deposited on a surface of a substrate made of a polymer, by using physical vapor deposition, a large number of nuclei of metal nanoparticles are formed on the surface of the substrate, and the particles grow. As a result, a fibrous member and/or a shell constructed of aggregates of metal nanoparticles are formed on the surface of the substrate.