Metal oxide nanorods

• US 5,897,945 A
• Filed: 02/26/1996
• Issued: 04/27/1999
• Est. Priority Date: 02/26/1996
• Status: Expired due to Term

• Current Assignee: President and Fellows of Harvard College (Harvard Corporation)
• Original Assignee: President and Fellows of Harvard College (Harvard Corporation)
• Inventors: Yang, Peidong, Lieber, Charles M.
• Primary Examiner(s): YAMNITZKY, MARIE ROSE
• Application Number:
  US08/606,892
• Time in Patent Office: 1,156 Days
• Field of Search: 428/401, 428/364, 428/375, 428/323, 428/328, 428/329, 428/330, 428/332, 428/293.1, 428/293.4, 428/148, 428/149, 428/699, 428/700, 428/701, 428/702, 428/903, 428/930, 505/230, 505/238, 117/87, 423/592, 423/593, 423/594, 423/598, 423/608, 423/622, 423/632, 423/635
• US Class Current: 428/323
• CPC Class Codes: C30B 23/00 Single-crystal growth by condensing evaporated or sublimed materials
• CPC Class Codes: C30B 29/16 Oxides
• CPC Class Codes: C30B 29/605 Products containing multiple oriented crystallites, e.g. columnar crystallites
• CPC Class Codes: H10N 60/85 Superconducting active materials
• CPC Class Codes: H10N 60/857 comprising copper oxide
• CPC Class Codes: Y10S 428/903 Microfiber, less than 100 micron diameter
• CPC Class Codes: Y10S 428/93 Electric superconducting
• CPC Class Codes: Y10T 428/24413 Metal or metal compound
• CPC Class Codes: Y10T 428/24421 Silicon containing
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof

Abstract

Metal oxide nanorods and composite materials containing such nanorods. The metal oxide nanorods have diameters between 1 and 200 nm and aspect ratios between 5 and 2000.

Claims

1. A composite comprising a substrate and a metal oxide nanorod consisting essentially of a metal oxide comprising a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, osmium, cobalt, nickel, copper, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, gallium, indium, thallium, germanium, tin, lead, magnesium, calcium, strontium, and barium, or said metal oxide is Al₂ O₃ ;

wherein said metal oxide nanorod has a narrow dimension between 1 and 100 nanometers, and an aspect ratio between 5 and 2000, wherein the metal oxide nanorod is a single crystal, and said metal oxide nanorod is on the substrate and is aligned perpendicular to a surface of the substrate.

2. The composite of claim 1 wherein said metal is selected from the group consisting of magnesium, zinc, cadium, iron, cerium, zirconium, yttrium, barium, strontium, titatium, lanthanum, and nickel.

3. The composite of claim 2 wherein said narrow dimension is between 5 and 50 nanometers.

4. The composite of nanorod of claim 1 wherein said narrow dimension is between 5 and 50 nanometers.

5. The composite of claim 1, wherein the metal oxide nanorod consists essentially of zinc oxide or metal-doped zinc oxide.

6. A composite comprising a substrate and a metal oxide nanorod comprising magnesium oxide wherein said metal oxide nanorod is a single crystal and has a narrow dimension between 1 and 100 nanometers, and an aspect ratio between 5 and 2000, and the metal oxide nanorod is on the substrate and is aligned perpendicular to a surface of the substrate.

7. A composite comprising a substrate and a metal oxide nanorod consisting essentially of a metal oxide made of the elements M¹, M², and oxygen, wherein M¹ is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, osmium, cobalt, nickel, copper, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, magnesium, calcium, strontium, and barium, and M² is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, osmium, cobalt, nickel, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, gallium, indium, thallium, germanium, tin, lead, magnesium, calcium, strontium, and barium;

wherein said metal oxide nanorod is a single crystal and has a narrow dimension between 1 and 100 nanometers and an aspect ratio between 5 and 2000, and said metal oxide nanorod is on the substrate and is aligned perpendicular to a surface of the substrate.

8. The composite of claim 7 wherein M¹ is selected from the group consisting of magnesium, aluminum, zinc, cadmium, iron, cerium, zirconium, yttrium, barium, strontium, titanium, lanthanum, and nickel, and M² is selected from the group consisting of magnesium, zinc, cadmium, cerium, zirconium, yttrium, barium, strontium, titanium, lanthanum, and nickel.

9. The composite of claim 7 wherein said narrow dimension is between 5 and 50 nanometers.

10. The composite of claim 7 wherein the metal oxide is MgO, ZnO, Zn:

ZnO, or In;

ZnO.

11. A nanorod composite comprising a metal oxide nanorod contained in a surrounding matrix material, wherein

said metal oxide nanorod consists essentially of a single crystal of a metal oxide, said metal oxide comprising a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, osmium, cobalt, nickel, copper, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, aluminum, gallium, indium, thallium, germanium, tin, lead, magnesium, calcium, strontium, and barium;

said metal oxide nanorod having a narrow dimension between 1 and 200 nanometers and an aspect ratio between 5 and 2000; and

said matrix material includes a superconductor.

12. The nanorod composite of claim 11 wherein said matrix material is a copper oxide superconductor.

13. The nanorod composite of claim 11 wherein said composite includes a substrate and a plurality of said metal oxide nanorods, and said metal oxide nanorods are aligned perpendicular to a surface of the substrate.

14. The nanorod composite of claim 11 wherein said metal oxide nanorod is a magnesium oxide nanorod.

15. The nanorod composite of claim 11 wherein the metal oxide is MgO, Al₂ O₃, ZnO, Zn:

ZnO, or In;

ZnO.

16. The nanorod composite of claim 11 wherein the metal oxide is made of the elements M¹, M², and oxygen, wherein M¹ is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, osmium, cobalt, nickel, copper, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, gallium, indium, thallium, germanium, tin, lead, magnesium, calcium, strontium, and barium;

and M² is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, osmium, cobalt, nickel, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, gallium, indium, thallium, germanium, tin, lead, magnesium, calcium, strontium, and barium.

17. A nanorod composite comprising a metal oxide nanorod contained in a surrounding superconductor matrix material, wherein said metal oxide nanorod consists essentially of a single crystal of a metal oxide and said metal oxide comprises a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, osmium, cobalt, nickel, copper, zinc, cadmium, scandium, yttrium, lanthanum, a lanthanide series element, boron, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, magnesium, calcium, strontium, and barium, said metal oxide nanorod having a narrow dimension between 1 and 200 nanometers and an aspect ratio between 5 and 2000.

18. The nanorod composite of claim 17 wherein said metal is selected from the group consisting of magnesium, aluminum, zinc, cadmium, cerium, zirconium, yttrium, barium, strontium, titanium, and lanthanum.

19. The nanorod composite of claim 17 wherein said nanorod composite is a film on a substrate and said metal oxide nanorod is aligned relative to a surface of the substrate.

20. The nanorod composite of claim 17 wherein said superconductor is a copper oxide superconductor.

21. The nanorod composite of claim 20 wherein said copper oxide superconductor is Bi₂ Sr₂ CaCu₂ O₈, YBa₂ Cu₃ O₇, Tl₂ Ba₂ Ca₂ Cu₃ O₁₀, or Tl₂ Ba₂ CaCu₂ O₈.

22. The nanorod composite of claim 17 wherein said composite includes a plurality of said metal oxide nanorods.

23. The nanorod composite of claim 22 wherein the nanorod composite is a film on a substrate and each of said plurality of metal oxide nanorods is aligned perpendicular to a surface of the substrate.

24. The nanorod composite of claim 17 wherein said composite is a film composite.

25. The nanorod composite of claim 17 wherein the composite is a bulk composite.

26. The nanorod composite of claim 17 wherein said metal oxide nanorod is a magnesium oxide nanorod.