Method for preparing uniform single walled carbon nanotubes
First Claim
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1. A method for producing single walled carbon nanotubes comprising:
- (a) reacting a carbon containing gas under reaction conditions with a composition comprisingfullerene on a precursor of a metal catalyst, wherein the precursor of a metal catalyst is coated with a thin film of fullerene, andwherein said reaction conditions are suitable for reducing said metal catalyst precursor, said conditions being at atmospheric pressure or greater; and
(b) growing single walled carbon nanotubes, wherein said fullerene serves as a seed for growth of the single walled carbon nanotubes.
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Abstract
Methods of preparing single walled carbon nanotubes from a metal catalyst having deposited thereon fullerenes are provided. Fullerenes are deposited onto a metal catalyst precursor or metal catalyst. In the presence of a carbon containing gas, the metal catalyst precursor/fullerene composition is then exposed to conditions suitable for reducing the metal catalyst precursor, for subliming the fullerene and for growing single walled carbon nanotubes. The fullerenes form the end caps for the resulting single walled carbon nanotubes, which are uniform in diameter.
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Citations
15 Claims
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1. A method for producing single walled carbon nanotubes comprising:
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(a) reacting a carbon containing gas under reaction conditions with a composition comprising fullerene on a precursor of a metal catalyst, wherein the precursor of a metal catalyst is coated with a thin film of fullerene, and wherein said reaction conditions are suitable for reducing said metal catalyst precursor, said conditions being at atmospheric pressure or greater; and (b) growing single walled carbon nanotubes, wherein said fullerene serves as a seed for growth of the single walled carbon nanotubes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for producing single walled carbon nanotubes comprising:
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(a) forming a composition comprising fullerene on a precursor of a metal catalyst, wherein the precursor of a metal catalyst is coated with a thin film of fullerene, (b) reacting a carbon containing gas in the presence of said composition under reaction conditions suitable for reducing said metal catalyst precursor, wherein the temperature of said reaction condition is lower than the sublimation temperature of said fullerene and the pressure of said reaction condition is 1 atmosphere or greater, and (c) growing single walled carbon nanotubes having a single raman peak in the RBM region, wherein said fullerene serves as a seed for growth of the single walled carbon nanotubes. - View Dependent Claims (11, 12)
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13. A method for producing single walled carbon nanotubes comprising:
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(a) forming a composition comprising fullerene on a metal catalyst, wherein the metal catalyst is coated with a thin film of fullerene, (b) reacting a carbon containing gas in the presence of said composition at a temperature lower than the sublimation temperature of said fullerene and at atmospheric pressure or greater, and (c) growing a multiplicity of single walled carbon nanotubes, wherein at least 80% of the single walled carbon nanotubes in said multiplicity have a diameter within ±
5% of a single walled carbon nanotube diameter D present in said multiplicity, said diameter D being in the range between 0.6-2.2 nm, wherein said fullerene serves as a seed for growth of the single walled carbon nanotubes. - View Dependent Claims (14, 15)
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Specification