Synthesis of quantum dot/polymer/layered-structure ceramic composite

Patent metadata

Field	Value
Publication number	US-9802396-B2
Application number	US-201314441170-A
Country	US
Kind code	B2
Filing date	Oct 28, 2013
Priority date	Nov 7, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present invention relates to a quantum dot and a preparation method therefor, and more specifically, to a novel quantum dot composite having high surface stability, and a preparation method therefor. The quantum dot composite according to the present invention constitutes a layered-structure ceramic composite in which the layered-structure ceramic comprises a polymer-quantum dot composite between the layers thereof.

First claim

The invention claimed is:

1. A layered ceramic composite, configured such that a layered ceramic includes a polymer-quantum dot composite between layers thereof, wherein the polymer-quantum dot composite is a composite that comprises anionic polymers having a hydrophobic portion attach to organic molecules on the surface of the quantum dot.

2. The layered ceramic composite of claim 1 , wherein the anionic polymer includes at least one anionic group selected from the group consisting of carboxylate, sulfate, sulfonate, nitrate, phosphate, and phosphonate.

3. The layered ceramic composite of claim 1 , wherein the polymer is poly(maleic anhydride-alt-1-octadecene).

4. The layered ceramic composite of claim 1 , wherein the layered ceramic is a layered double hydroxide.

5. The layered ceramic composite of claim 4 , wherein the layered double hydroxide is represented by Formula (1) below:
[M m 2+ M n 3+ (OH) 2m+2n ]X n/z z− .bH 2 O   (1)

wherein M 2+ is Zn 2+ , Mn 2+ , Ni 2+ , Co 2+ , Fe 2+ , Cu 2+ , Sn 2+ , Ba 2+ , Ca 2+ , or Mg 2+ ; M 3+ is Al 3+ , Cr 3+ , Fe 3+ , Co 3+ , Mn 3+ , Ni 3+ , Ce 3+ , or Ga 3+ ; m and n are set so that m/n is 1˜10; b is 0˜10; and X is an anion selected from the group consisting of hydroxide, carbonate, bicarbonate, nitrate, chloride, bromide, sulfonate, sulfate, bisulfate, vanadate, tungstate, borate, phosphate, and Keggin-ions.

6. The layered ceramic composite of claim 1 , wherein the quantum dot is a nanoparticle comprising at least one semiconductor material selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, InP, InAs, InSb, AlP, AlS, AlAs, AlSb, GaN, GaP, GaAs, GaSb, PbS, PbSe, Si, Ge, MgS, MgSe, and MgTe.

7. An illuminator, a display, an optical coating material, an anionic exchange material, a catalyst support, an electronic material, a UV absorbent, or a photocatalyst, comprising the layered ceramic composite of claim 1 .

8. A method of manufacturing a layered ceramic composite, comprising reacting an anionic polymer-quantum dot composite with a cationic exfoliated layered double hydroxide, wherein the polymer-quantum dot composite is a composite that comprises anionic polymers having a hydrophobic portion attach to organic molecules on the surface of the quantum dot.

9. The method of claim 8 , wherein the anionic polymer-quantum dot composite is configured such that a surface of quantum dots is surrounded by an anionic polymer.

10. The method of claim 8 , wherein the exfoliated layered double hydroxide is mixed and reacted with an aqueous solution of the anionic polymer-quantum dot composite.

11. The method of claim 8 , wherein the anionic polymer-quantum dot composite is obtained by mixing quantum dots dispersed in an organic solvent with an anionic polymer aqueous solution and then removing the organic solvent.

12. The method of claim 11 , wherein the anionic polymer is an amphiphilic polymer comprising an anionic group reacting with the cationic exfoliated layered double hydroxide and a hydrophobic group linked to the quantum dots.

13. The method of claim 8 , wherein the anionic polymer includes at least one anion selected from the group consisting of carboxylate, sulfate, sulfonate, nitrate, phosphate, and phosphonate.

14. The method of claim 8 , wherein the anionic polymer is prepared by hydrolyzing poly(maleic anhydride-alt-1-octadecene).

15. The method of claim 8 , wherein the exfoliated layered double hydroxide is obtained by substituting an interlayer ion of a layered double hydroxide.

Assignees

• Postech Academy-Industry Found

Inventors

• Kim Sungjee
• Cho Seung Ho
• Kwag Jung Heon
• Jeong Sanghwa

Classifications

• B32B9/005 Primary

  comprising one layer of ceramic material, e.g. porcelain, ceramic tile (layered products with at least two ceramic layers composed mainly of ceramic B32B18/00) · CPC title

• B32B27/30 Primary

  comprising vinyl {(co)polymers; comprising acrylic (co)polymers} · CPC title

• C01G11/006

  Compounds containing cadmium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01G9/006

  Compounds containing zinc, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01B19/007

  Tellurides or selenides of metals (C01B19/002 takes precedence) · CPC title