NANOCOMPOSITE MATERIAL AND METHOD OF MANUFACTURING THE SAME

• US 20070199109A1
• Filed: 12/04/2006
• Published: 08/23/2007
• Est. Priority Date: 02/21/2006
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Byung-ki, YI, Dong-kee, CHOI, Seong-jae, LEE, Jae-ho, JANG, Eun-joo
• Granted Patent: US 7,611,750 B2
• Time in Patent Office: Days
• US Class Current: 428/332
• CPC Class Codes: B22F 1/054 Nanosized particles
• CPC Class Codes: B22F 1/16 Metallic particles coated with a non-metal coated with lubricating or binding agents or with organic material B22F1/10
• CPC Class Codes: B22F 2202/17 use of centrifugal or vortex forces
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C04B 2235/32 Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
• CPC Class Codes: C04B 2235/3272 Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
• CPC Class Codes: C04B 2235/3284 Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3286 Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
• CPC Class Codes: C04B 2235/405 Iron group metals
• CPC Class Codes: C04B 2235/408 Noble metals
• CPC Class Codes: C04B 2235/441 Alkoxides, e.g. methoxide, tert-butoxide
• CPC Class Codes: C04B 2235/446 Sulfides, tellurides or selenides
• CPC Class Codes: C04B 2235/5454 nanometer sized, i.e. below 100 nm
• CPC Class Codes: C04B 35/624 Sol-gel processing
• CPC Class Codes: C04B 35/6264 Mixing media, e.g. organic solvents
• CPC Class Codes: C04B 35/62807 Silica or silicates
• CPC Class Codes: C04B 35/62821 Titanium oxide
• CPC Class Codes: C04B 35/62886 by wet chemical techniques
• CPC Class Codes: C04B 35/632 Organic additives
• CPC Class Codes: C22C 1/1026 : starting from a solution or a suspension of (a) compound(s) of at least one of the alloy constituents
• CPC Class Codes: C22C 29/12 : based on oxides
• CPC Class Codes: Y10S 977/778 : within specified host or matrix material, e.g. nanocomposite films
• CPC Class Codes: Y10S 977/779 : Possessing nanosized particles, powders, flakes, or clusters other than simple atomic impurity doping
• CPC Class Codes: Y10T 428/26 : Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/2991 : Coated
• CPC Class Codes: Y10T 428/2993 : Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Abstract

A nanocomposite material and a method of manufacturing the same are disclosed. The nanocomposite material includes a plurality of nanoparticles coated with a metal oxide, and a matrix of the metal oxide immobilizing the nanoparticles that are dispersed therein. The nanocomposite material is manufactured such that macro- or macro-scale cracks are prevented or effectively prevented, light stability is enhanced over a light-emitting period, and light brightness is improved.

Claims

1. A nanocomposite material, comprising a plurality of nanoparticles coated with a metal oxide, and a matrix of the metal oxide immobilizing the nanoparticles that are disposed therein.

2. The nanocomposite material of claim 1, wherein the matrix is formed form a network structure of the metal oxide.

3. The nanocomposite material of claim 1, wherein the metal oxide is SiO₂ or TiO₂.

4. The nanocomposite material of claim 1, wherein the plurality of nanoparticles comprise quantum dots comprising a Group II-VI semiconductor compound selected from the group consisting of CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, InP, GaP, and GainP₂.

5. The nanocomposite material of claim 1, wherein the plurality of nanoparticles comprise metal particles selected from the group consisting of Au, Ag, Fe, and Co, or an oxide particle of the selected metal.

6. A method of manufacturing a nanocomposite material comprising:

coating surfaces of synthesized nanoparticles with a metal oxide to modify the surfaces of the nanoparticles.

conducting a sol-gel reaction in a precursor solution in which the surface-modified nanoparticles are mixed with a precursor material of the metal oxide; and

drying the precursor solution to form a solid matrix.

7. The method of claim 6, further comprising synthesizing a plurality of nanoparticles.

8. The method of claim 6, wherein the nanoparticles comprise quantum dots comprising a Group II-VI semiconductor compound selected from the group consisting of CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, InP, GaP, and GainP₂.

9. The method of claim 6, wherein the nanoparticles comprise metal particles selected from the group consisting of Au, Ag, Fe, and Co, or an oxide particle of the selected metal.

10. The method of claim 6, wherein synthesizing the plurality of nanoparticles comprises:

injecting at least one precursor material into an organic solvent capable of being coordinated; and

growing crystals into nanoparticles having a uniform size.

11. The method of claim 6, wherein the metal oxide is SiO₂ or TiO₂.

12. The method of claim 6, wherein modifying the surface of the nanoparticles comprises:

mixing the nanoparticles, an alkali catalyst for synthesizing the metal oxide, and a precursor material of the metal oxide in an organic solvent in which a surfactant is dispersed; and

conducting a condensation reaction to synthesize the metal oxide on the surface of the nanoparticles.

13. The method of claim 12, wherein the surfactant is a non-ionic surfactant that has an ether group as a hydrophilic group and an alkyl group as a hydrophobic group.

14. The method of claim 13, wherein the surfactant is polyoxyethylene(5)nonylphenyl ether.

15. The method of claim 12, wherein the organic solvent is cyclohexane.

16. The method of claim 12, wherein the precursor material is tetraethylorthosilicate.

17. The method of claim 12, wherein the alkali catalyst is a solution of aqueous ammonia.

18. The method of claim 6, wherein the sol-gel reaction is conducted in a precursor solution in which the coated nanoparticles, a precursor material, and an alkali catalyst mediating a covalent bond between the coated nanoparticles and the precursor material are mixed in predetermined ratios in a polar aqueous solvent.

19. The method of claim 18, wherein the precursor material of the sol-gel reaction is tetramethoxysilane.

20. The method of claim 18, wherein the alkali crystal of the sol-gel reaction is a solution of aqueous ammonia.

21. The method of claim 18, wherein the polar aqueous solvent of the sol-gel reaction is ethanol.

22. The method of claim 6, wherein the drying comprises exposing the precursor solution to an inert gas atmosphere or heating the precursor solution at a constant temperature.