Three dimensional chiral nanostructures

Patent metadata

Field	Value
Publication number	US-11465202-B2
Application number	US-201916609562-A
Country	US
Kind code	B2
Filing date	Apr 1, 2019
Priority date	Apr 6, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A three-dimensional chiral nanostructure according to an embodiment of the present invention comprises: metal nanoparticles having a chiral structure: and a coating layer enclosing the metal nanoparticles. The metal nanoparticle is formed in a polyhedral structure having an R region and an S region in which atoms are arranged clockwise and counterclockwise, respectively, in the order of (111), (100), and (110) crystal faces on the basis of the chiral center, wherein at least a portion of the edges form a curve tilting and extending from the R or S region so that the metal nanoparticle has a chiral structure.

First claim

The invention claimed is:

1. A three-dimensional chiral nanostructure, comprising:
a metal nanoparticle having a chiral structure; and
a coating layer enclosing the metal nanoparticle,
wherein the metal nanoparticle has a polyhedral structure having an R region in which an arrangement of atoms changes in a clockwise direction and an S region in which an arrangement of atoms changes in a counterclockwise direction, in an order of (111), (100), and (110) with reference to a chiral center, where at least a portion of edges of the metal nanoparticle is tilted or changed to form a curved line, and expanded from the R region or the S region and forms a curved surface such that the metal nanoparticle has a chiral structure.

2. The three-dimensional chiral nanostructure of claim 1 , wherein the coating layer is formed of an inorganic material that is a dielectric.

3. The three-dimensional chiral nanostructure of claim 2 , wherein the coating layer includes silica (SiO 2 ).

4. The three-dimensional chiral nanostructure of claim 2 , wherein the metal nanoparticle has a size of 50 nm to 500 nm, and the coating layer has a thickness of 3 nm to 70 nm.

5. The three-dimensional chiral nanostructure of claim 1 , wherein the coating layer is an organic material including a thiol group.

6. The three-dimensional chiral nanostructure of claim 5 ,
wherein the organic material is absorbed to one of the S region and the R region in relatively high concentrations.

7. The three-dimensional chiral nanostructure of claim 1 , wherein the metal nanoparticle includes a seed region formed of a first metal, and a heterogeneous region disposed on an external side of the seed region to enclose the seed region and formed of a second metal.

8. The three-dimensional chiral nanostructure of claim 1 , wherein the coating layer is at least one of cetyltrimethylammonium bromide (CTAB), cetyltrimethylammonium chloride (CTAC), cetylpyridinium chloride (CPC), polyvinylpyrrolidone (PVP), cysteine (Cys), and glutathione.

9. The three-dimensional chiral nanostructure of claim 1 , further comprising:
a quantum dot coupled to the metal nanoparticle by the coating layer.

10. The three-dimensional chiral nanostructure of claim 9 ,
wherein the coating layer includes a first coating layer formed of an inorganic material and a second coating layer formed of an organic material and absorbed to the first coating layer, and
wherein the quantum dot is connected to the second coating layer.

11. The three-dimensional chiral nanostructure of claim 10 ,
wherein the second coating layer has an amine group, and
wherein the quantum dot has an organic ligand having a carboxylic acid group.

12. The three-dimensional chiral nanostructure of claim 9 , wherein the quantum got includes silicon or a compound semiconductor.

13. A three-dimensional chiral nanostructure, comprising:
a metal nanoparticle having a polyhedral structure including an R region in which atoms are arranged in a clockwise direction and an S region in which atoms are arranged in a counterclockwise direction, in an order of crystal planes of (111), (100), and (110) with reference to a chiral center, where at least a portion of edges of the metal nanoparticle is tilted or changed to form a curved line, and expanded from the R region or the S region and forms a curved surface such that the metal nanoparticle has a chiral structure.

14. The three-dimensional chiral nanostructure of claim 13 , wherein at least a portion of a surface of the metal nanoparticle is planes having a high Miller index.

15. The three-dimensional chiral nanostructure of claim 14 , wherein the planes having a high Miller index include at least one of planes {221}, {551}, {553}, and {331}.

16. The three-dimensional chiral nanostructure of claim 13 , wherein the expanded edge has a twisted form, twisted by a certain angle with reference to a corner of the polyhedral structure.

17. The three-dimensional chiral nanostructure of claim 13 , wherein the expanded edge is tilted from one of the R region and the S region to the other on a boundary between the R region and the S region.

18. The three-dimensional chiral nanostructure of claim 17 , wherein the tilted edge extends to an adjacent region in a length direction of the edge.

19. The three-dimensional chiral nanostructure of claim 13 , wherein the expanded edge expands in a direction of an external side of one of the R region and the S region and forms an outwardly curved shape.

20. The three-dimensional chiral nanostructure of claim 19 , wherein the expanded edge is grown in a height direction of the edge and has a protruding shape.

Assignees

• Seoul Nat Univ R&Db Foundation
• Global Frontier Ct Multiscale Energy Systems

Inventors

• Nam Ki-Tae
• Lee Hye-Eun
• Ahn Hyo-Yong
• Cho Nam-Heon

Classifications

• B22F1/105 Primary

  containing inorganic lubricating or binding agents, e.g. metal salts · CPC title

• C09K11/025

  non-luminescent particle coatings or suspension media · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• B82B1/00

  Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units · CPC title