Method of producing nanosized oxide powders

• US 20050053538A1
• Filed: 09/04/2003
• Published: 03/10/2005
• Est. Priority Date: 09/04/2003
• Status: Active Grant

• Current Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Original Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Inventors: Holloway, Paul H., Abboudi, Mostafa
• Granted Patent: US 7,135,161 B2
• Time in Patent Office: Days
• US Class Current: 423/263
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 13/18 by thermal decomposition of compounds, e.g. of salts or hydroxides
• CPC Class Codes: C01B 13/185 Preparing mixtures of oxides
• CPC Class Codes: C01F 17/229 Lanthanum oxides or hydroxides
• CPC Class Codes: C01F 17/241 containing two or more rare earth metals, e.g. NdPrO3 or LaNdPrO3
• CPC Class Codes: C01G 1/02 Oxides
• CPC Class Codes: C01G 15/00 Compounds of gallium, indium or thallium
• CPC Class Codes: C01G 49/00 Compounds of iron
• CPC Class Codes: C01P 2002/54 one element only
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C09K 11/623 with zinc or cadmium
• CPC Class Codes: C09K 11/7769 Oxides C09K11/7768 takes precedence
• CPC Class Codes: H01B 1/08 oxides
• CPC Class Codes: H01B 1/122 Ionic conductors
• CPC Class Codes: Y10S 977/775 Nanosized powder or flake, e.g. nanosized catalyst
• CPC Class Codes: Y10S 977/777 Metallic powder or flake
• CPC Class Codes: Y10S 977/811 : Of specified metal oxide composition, e.g. conducting or semiconducting compositions such as ITO, ZnOx

Abstract

A method of forming metal oxide powders includes the steps of solid state mixing of at least one metal nitrate salt and at least one reducing organic acid. The mixture is heated to form a metal oxide powder. A metal oxide precursor intermediate can be formed and then heated to form the metal oxide powder.

Claims

1. A method of forming metal oxide powders, comprising the steps of:

solid state mixing of at least one metal nitrate salt and at least one reducing organic acid, and

heating said metal nitrate salt and said reducing organic acid, wherein a metal oxide powder is formed.

2. The method of claim 1, wherein said heating comprises a first heating step which forms a metal oxide precursor complex from said metal nitrate salt and said reducing organic acid, and a second heating step which converts said precursor complex into said metal oxide powder.

3. The method of claim 1, wherein at least a portion of said heating is performed in an oxygen containing atmosphere.

4. The method of claim 1, wherein said organic acid is a hydroxy acid.

5. The method of claim 4, wherein said hydroxy acid comprises tartaric acid or citric acid.

6. The method of claim 1, wherein an average particle size of said metal oxide powder is from 10 to 100 nm.

7. The method of claim 1, wherein said at least one metal nitrate salt comprises at least two different metal nitrate salts.

8. The method of claim 2, wherein said first heating step is performed at a temperature from 200 to 400°

C.

9. The method of claim 2, wherein said second heating step is performed at a temperature from 200 to 1600°

C.

10. The method of claim 2, further comprising the step of grinding said precursor before said second heating step.

11. The method of claim 1, wherein said metal oxide includes at least one phosphor.

12. The method of claim 1, wherein said metal oxide includes at least one ion conducting metal oxide.