Method of purifying single wall carbon nanotubes

Details Method of purifying single wall carbon nanotubes Method of purifying single wall carbon nanotubes

2006-11-14

2006-11-14

Hendrickson, Stuart (Department: 1754)

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

C977S844000

Reexamination Certificate

active

07135158

ABSTRACT:
There is provided a method of purifying single wall carbon nanotubes so as to be able to remove impurities such as a metal catalyst to obtain the single wall carbon nanotubes with high purity. The method includes the first oxidizing step of oxidizing the single wall carbon nanotubes soot1containing an impurity with a metal catalyst2,the first refluxing step of refluxing the single wall carbon nanotubes soot1obtained by the first oxidizing step in an acid solution, the second oxidizing step of oxidizing the single wall carbon nanotubes soot1obtained by the first refluxing step, and the second refluxing step of refluxing the single wall carbon nanotubes obtained soot1by the second oxidizing step in an acid solution. The single wall nanotubes1are synthesized by an arc discharge with a carbon electrode containing a metal catalyst2.The carbon electrode contains a metal catalyst which consists of Ni, Y, and Ti. The first oxidizing step is performed by heating at a temperature between 350 and 600° C. or by a wet-oxidization in hydrogen peroxide solution. The first refluxing step is performed by refluxing in nitric acid. The second oxidizing step is performed by wet-oxidizing in hydrogen peroxide. The second refluxing step is performed by refluxing in hydrochloric acid.

REFERENCES:
Liu et al., ‘Fullerene Pipes’ in Science vol. 280 pp. 1253-1256, May 22, 1998.
Tohji et al., ‘Purifying single-walled nanotubes’ inNaturevol. 383, p. 679 (Oct. 24, 1996).

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