Carbide nanomaterials

• US 6,190,634 B1
• Filed: 06/07/1995
• Issued: 02/20/2001
• Est. Priority Date: 06/07/1995
• 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: Dai, Hongjie, Lieber, Charles M.
• Primary Examiner(s): Griffin, Steven P.
• Assistant Examiner(s): DI MAURO, PETER T
• Application Number:
  US08/477,080
• Time in Patent Office: 2,085 Days
• Field of Search: 423/439, 423/440, 423/445.B, 423/DIG.39, 423/DIG.40, 423/447.2, 423/414, 428/366, 428/367
• US Class Current: 423/439
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 32/907 Oxycarbides; Sulfocarbides; Mixture of carbides
• CPC Class Codes: C01B 32/914 Carbides of single elements
• CPC Class Codes: C01B 32/921 Titanium carbide
• CPC Class Codes: C01B 32/956 Silicon carbide
• CPC Class Codes: C01B 32/97 Preparation from SiO or SiO2
• CPC Class Codes: C01B 32/991 Boron carbide
• CPC Class Codes: C01P 2002/77 by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2004/13 Nanotubes
• CPC Class Codes: C01P 2004/54 Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C30B 23/00 Single-crystal growth by condensing evaporated or sublimed materials
• CPC Class Codes: C30B 25/00 Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
• CPC Class Codes: C30B 29/36 Carbides
• CPC Class Codes: D01F 11/126 Carbides boron-comprising compounds D01F11/124; nitrogen carbide D01F11/128
• CPC Class Codes: D01F 9/127 by thermal decomposition of hydrocarbon gases or vapours or other carbon-containing compounds in the form of gas or vapour, e.g. carbon monoxide, alcohols
• CPC Class Codes: Y10T 428/2916 including boron or compound thereof [not as steel]
• CPC Class Codes: Y10T 428/2918 including free carbon or carbide or therewith [not as steel]

Abstract

A nanoscale carbide article consisting essentially of covalently bounded elements M¹, M², and C having the molar ratio M¹:M²:C::1:y:x, wherein the article has an aspect ratio of between 10 and 1000 and has a shorter axis of between 1 and 40 nanometers.

Claims

1. A carbide nanorod consisting essentially of TiC, NbC, Fe₃C, or BC_x in which x is between 0.1 and 2.1, inclusive, wherein said nanorod has an aspect ratio of between 11 and 1000, and has a shorter axis of between 1 and 40 nanometers.

2. A carbide nanorod consisting essentially of covalently bonded elements M¹, M² and C having the molar ratio M¹:

M²;

C;

;

1;

y;

x,

wherein said first element M¹ is tungsten, molybdenum, zirconium, hafnium, vanadium, tantalum, chromium, manganese, technetium, rhenium, osmium, cobalt, nickel, a lanthanide series element, scandium, yttrium, or lanthanum;

said second element M² is nitrogen, boron, phosphorus, zinc, aluminum, copper, germanium, cadmium, indium, tin, lead, thallium, or the elements in said first element group, in which y is between 0 and 0.9, inclusive, provided that said first and second element are not the same; and

said third element C is carbon, in which x is between 0.1 and 2.1, inclusive;

wherein said nanorod has an aspect ratio of between 11 and 1000, and has a shorter axis of between 1 and 40 nanometers.