METHOD OF COATING NANOPARTICLES

• US 20070110816A1
• Filed: 11/13/2006
• Published: 05/17/2007
• Est. Priority Date: 11/11/2005
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Jun, Shin-ae, Lim, Jung, Jang, Eun
• Application Number:
  US11/558,937
• Publication Number:
  US 20070110816A1
• Time in Patent Office: Days
• US Class Current: 424/490
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 19/002 Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions
• CPC Class Codes: C01B 19/007 Tellurides or selenides of metals C01B19/002 takes precedence
• CPC Class Codes: C01P 2004/04 obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2004/80 Particles consisting of a mixture of two or more inorganic phases
• CPC Class Codes: C04B 2235/3284 Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3826 Silicon carbides
• CPC Class Codes: C04B 2235/3852 Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
• CPC Class Codes: C04B 2235/3865 Aluminium nitrides
• CPC Class Codes: C04B 2235/408 Noble metals
• CPC Class Codes: C04B 2235/446 Sulfides, tellurides or selenides
• CPC Class Codes: C04B 35/6264 Mixing media, e.g. organic solvents
• CPC Class Codes: C04B 35/628 Coating the powders or the macroscopic reinforcing agents
• CPC Class Codes: C04B 35/62805 Oxide ceramics
• CPC Class Codes: C04B 35/62807 Silica or silicates
• CPC Class Codes: C04B 35/62813 Alumina or aluminates
• CPC Class Codes: C04B 35/62815 Rare earth metal oxides
• CPC Class Codes: C04B 35/62818 Refractory metal oxides
• CPC Class Codes: C04B 35/62821 Titanium oxide
• CPC Class Codes: C04B 35/62823 : Zirconium or hafnium oxide
• CPC Class Codes: C04B 35/62828 : Non-oxide ceramics
• CPC Class Codes: C04B 35/62886 : by wet chemical techniques
• CPC Class Codes: C04B 35/632 : Organic additives

Abstract

Disclosed herein is a method of coating nanoparticles with a metal oxide. The method includes substituting surfaces of hydrophobic nanoparticles with an organic substance having a hydrophilic group effective to render the nanoparticles hydrophilic; and injecting the hydrophilic nanoparticles and a precursor of the metal oxide into an organic solvent including an amphiphilic surfactant to coat the nanoparticles with a metal oxide.

Claims

1. A method of coating nanoparticles with a metal oxide, comprising:

substituting surfaces of hydrophobic nanoparticles with an organic substance having a hydrophilic group to render the nanoparticles hydrophilic; and

injecting the hydrophilic nanoparticles and a precursor of the metal oxide into an organic solvent including an amphiphilic surfactant to coat the nanoparticles with the metal oxide.

2. The method of claim 1, wherein the substituting of the surfaces of the hydrophobic nanoparticles comprises:

substituting the surfaces of the hydrophobic nanoparticles with a hydrophilic surfactant to render the nanoparticles hydrophilic; and

dispersing the hydrophilic nanoparticles in a hydrophilic solvent.

3. The method of claim 2, wherein the hydrophilic surfactant comprises one of pyridine, dithiol, mercaptoalkyalchol, mercaptoalkylamine, mercaptoalkylsilane, aminoalkylsilane, and diamine.

4. The method of claim 2, wherein the hydrophilic solvent is selected from the group consisting of a primary alcohol, a secondary alcohol, a diol, a polyol, a cyclic amine, a cyclic ether, and a ketone.

5. The method of claim 2, wherein the hydrophilic solvent is a hydrophilic solvent selected from the group consisting of methanol, ethanol, propanol, butanol, isopropanol, isobutanol, tert-butanol, ethylene glycol, propylene glycol, butylene glycol, polyethylene glycol, pyridine, imidazole, tetrahydrofuran, and acetone.

6. The method of claim 1, wherein the nanoparticles are selected from the group consisting of a group II-VI compound, a group III-V compound, a group IV-VI compound, a group IV compound, a noble metal, a transition metal and a combination comprising at least one of the foregoing.

7. The method of claim 6, wherein the group II-VI compound, the group III-V compound, or the group IV-VI compound comprises a multinary compound.

8. The method of claim 7, wherein the group II-VI compound is a binary compound, a ternary compound, or a quaternary compound.

9. The method of claim 7, wherein the group III-V compound is a binary compound, a ternary compound, or a quaternary compound.

10. The method of claim 7, wherein the group IV-VI compound is a binary compound, a ternary compound, or a quaternary compound.

11. The method of claim 6, wherein the group IV compound is a single-element composition or a binary compound.

12. The method of claim 7, wherein each component of the multinary compound is included in each of the nanoparticles in a uniform concentration or in a gradient.

13. The method of claim 6, wherein the group II-VI compound is selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, and HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe.

14. The method of claim 6, wherein the group III-V compound is selected from the group consisting of GaN, GaP, GaAs, GaSb, AIN, AIP, AIAs, AISb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AINP, AINAs, AINSb, AIPAs, AIPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAINP, GaAINAs, GaAINSb, GaAIPAs, GaAIPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GalnPSb, InAINP, InAINAs, InAINSb, InAIPAs, and InAIPSb.

15. The method of claim 6, wherein the group IV-VI compound is selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe.

16. The method of claim 6, wherein the group IV compound is selected from the group consisting of Si, Ge, SiC, and SiGe.

17. The method of claim 6, wherein the noble metal or the transition metal is Pd, Pt, Ni, Co, Rh, Ir, Fe, Ru, Au, Ag, Cu, or a combination comprising at least one of the foregoing.

18. The method of Claim, 1, wherein the metal oxide is SiO₂, TiO₂, SnO₂, ZnO, ZnS, In₂O₃-SnO₂, Al₂O₃, HfO₂, BaTiO₃, CeO₂, ZrO₂, Ta₂O₅, or comprising at least one of the foregoing.

19. The method of claim 1, wherein the precursor of the metal oxide is selected from the group consisting of triethoxysilane, trimethoxysilane, tributhoxysilane, sodium silicate, titanium isopropoxide, titanium butoxide, tin butoxide, and sodium stannate.

20. The method of claim 1, wherein the nanoparticles comprise a core-shell or multishell structure.