Winstead Sechrest & Minick, P.C.
Method for purification of as-produced single-wall carbon nanotubes
This invention relates generally to a single-wall carbon nanotube (SWNT) purification process and more particularly to a purification process that comprises heating the SWNT-containing felt under oxidizing conditions to remove the amorphous carbon deposits and other contaminating materials. In a preferred mode of this purification procedure, the felt is heated in an aqueous solution of an inorganic oxidant, such as nitric acid, a mixture of hydrogen peroxide and sulfuric acid, or a potassium permanganate. Preferably, SWNT-containing felts are refluxed in an aqueous solution of an oxidizing acid at a concentration high enough to etch away amorphous carbon deposits within a practical time frame, but not so high that the single-wall carbon nanotube material will be etched to a significant degree. When material having a high proportion of SWNT is purified, the preparation produced will be enriched in single-wall nanotubes, so that the SWNT are substantially free of other material.
William Marsh Rice University
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Hongjie Jason H. Jie Pavel Daniel T. Kenneth A. Ting Andrew G. Richard E. Andreas
Dai Hafner Liu Nikolaev Colbert Smith Guo Rinzler Smalley Thess