Back to results
US 5,997,832 AGranted
Preparation of carbide nanorods
AssigneePresident and Fellows of Harvard College
InventorsCharles M. Lieber, Eric Wong
Life of this patent
Estimating the term…
Abstract
A process utilizing a supported metal catalyst, a volatile species source, and a carbon source has been developed to produce carbide nanorods with diameters of less than about 100 nm and aspect ratios of 10 to 1000. The volatile species source, carbon source, and supported metal catalyst can be used to produce carbide nanorods in single run, batch, and continuous reactors under relatively mild conditions. The method employs a simple catalytic process involving readily available starting materials.
Claims41
A method of producing a carbide nanorod comprising:
- providing a volatile species source, a carbon source, and a carrier coated with a metal catalyst in a furnace, wherein the metal catalyst is a mixture of molybdenum and iron in a molar ratio of Mo:Fe between 99:1 and 1:99 and is supported on particles having diameters less than 1000 angstroms;
- and
- heating the volatile species source, the carbon source, and the supported metal catalyst to a temperature between 500.degree. C. and 2500.degree. C. for a sufficient time to form the carbide nanorod having an aspect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers and including an element provided by the volatile species source and carbon provided by the carbon source, wherein
- the carbide includes titanium, silicon, niobium, iron, boron, tungsten, molybdenum, zirconium, hafnium, vanadium, tantalum, chromium, manganese, technetium, rhenium, osmium, cobalt, nickel, a lanthanide series element, scandium, yttrium, lanthanum, zinc, aluminum, copper, germanium, or a combination thereof.
1 more element
A method of producing a carbide nanorod comprising:
- providing a volatile species source, a carbon source, and a supported metal catalyst in a furnace, wherein the metal catalyst is a mixture of molybdenum and iron in a molar ratio of Mo:Fe between 99:1 and 1:99 and is supported on particles having diameters less than 1000 angstroms;
- and
- heating the volatile species source, the carbon source, and the supported metal catalyst to a temperature between 500.degree. C. and 2500.degree. C. for a sufficient time to form the carbide nanorod having an aspect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers and including an element provided by the volatile species source and carbon provided by the carbon source, wherein
- the carbide includes titanium, silicon, niobium, iron, boron, tungsten, molybdenum, zirconium, hafnium, vanadium, tantalum, chromium, manganese, technetium, rhenium, osmium, cobalt, nickel, a lanthanide series element, scandium, yttrium, lanthanum, zinc, aluminum, copper, germanium, or a combination thereof.
1 more element
A method of producing a carbide nanorod comprising:
- providing a volatile species source, a carbon source, and a supported metal catalyst in a furnace, wherein the metal source, the carbon source and the supported metal catalyst are sealed in a tube and the metal catalyst is supported on particles having diameters less than 1000 angstroms;
- and
- heating the volatile species source, the carbon source, and the supported metal catalyst to a temperature between 500.degree. C. and 2500.degree. C. for a sufficient time to form the carbide nanorod having an asDect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers and including an element provided by the volatile species source and carbon provided by the carbon source, wherein
- the carbide includes titanium, silicon, niobium, iron, boron, tungsten, molybdenum, zirconium, hafnium, vanadium, tantalum, chromium, manganese, technetium, rhenium, osmium, cobalt, nickel, a lanthanide series element, scandium, yttrium, lanthanum, zinc, aluminum, copper, germanium, or a combination thereof.
1 more element
A method of producing silicon carbide nanorods comprising:
- placing a volatile species source including silicon in a furnace;
- providing a carbon source and a supported metal catalyst in the furnace, wherein the metal catalyst is a mixture of molybdenum and iron in a molar ratio of Mo:Fe between 99:1 and 1:99 and is supported on particles having diameters less than 1000 angstroms;
- generating a vapor including silicon in the furnace by heating the metal source to a temperature between 500.degree. C. and 2500.degree. C. to form silicon carbide nanorods having an aspect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers;
- and
- collecting the silicon carbide nanorods thus formed.
2 more elements
A method of producing silicon carbide nanorods comprising:
- placing a volatile species source including silicon in a furnace;
- providing a carbon source and a supported metal catalyst in the furnace, wherein the volatile species source, the carbon source and the supported metal catalyst are sealed in a tube and the metal catalyst is supported on particles having diameters less than 1000 angstroms;
- generating a vapor including silicon in the furnace by heating the metal source to a temperature between 500.degree. C. and 2500.degree. C. to form silicon carbide nanorods having an aspect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers;
- and
- collecting the silicon carbide nanorods thus formed.
2 more elements
A method of producing a carbide nanorod comprising:
- providing a volatile species source, a carbon source, and a supported metal catalyst in a furnace, the supported metal catalyst including a mixture of molybdenum and iron in a molar ratio of Mo:Fe between 99:1 and 1:99;
- and
- heating the volatile species source, the carbon source, and the supported metal catalyst to a temperature between 500.degree. C. and 2500.degree. C. for a sufficient time to form the carbide nanorod having an aspect ratio of between 10 and 1000 and a short axis of between 1 and 40 nanometers and including an element provided by the volatile species source and carbon provided by the carbon source, wherein
- the carbide includes titanium, silicon, niobium, iron, boron, tungsten, molybdenum, zirconium, hafnium, vanadium, tantalum, chromium, manganese, technetium, rhenium, osmium, cobalt, nickel, a lanthanide series element, scandium, yttrium, lanthanum, zinc, aluminum, copper, germanium, or a combination thereof.
1 more element
A method of producing silicon carbide nanorods comprising:
- placing a volatile species source including silicon in a furnace;
- providing a carbon source and a supported metal catalyst in the furnace, the supported metal catalyst including a mixture of molybdenum and iron in a molar ratio of Mo:Fe between 99:1 and 1:99;
- generating a vapor including silicon in the furnace by heating the metal source to a temperature between 500.degree. C. and 2500.degree. C. to form silicon carbide nanorods;
- and
- collecting the silicon carbide nanorods thus formed.
2 more elements
Dependencies are inferred from the claim text.