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Highly purified single-wall carbon nanotubes and production thereof

United States Patent Application

20020081380
A1
View the Complete Application at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
Highly purified single-wall carbon nanotubes (SWNTs) and production thereof. The highly purified single-wall carbon nanotubes may be produced according to one embodiment of the invention by generating a crude SWNT material having a carbon nanotube fraction and a non-nanotube carbon fraction, refluxing the crude SWNT material in an acid solution to redistribute the non-nanotube carbon fraction as a uniform carbon coating on the carbon nanotube fraction, and oxidizing the refluxed SWNT material to remove the uniform carbon coating formed thereon. Preferably, metal is also removed during reflux.
Dillon, Anne C. (Boulder, CO), Gennett, Thomas (Pittsford, NY), Heben, Michael J. (Denver, CO)
10/ 076,195
February 12, 2002
[0002] The United States Government has rights in this invention pursuant to Contract No. DE-AC36-99GO10337 between the United States Department of Energy and the Midwest Research Institute.