Method for producing carbon nanotubes
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United States of America Patent
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Sep 24, 2002
Grant Date -
Mar 14, 2002
app pub date -
Jul 20, 1999
filing date -
Jul 21, 1998
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Abstract
The method of the present invention deposits carbon nanotubes by contacting carbon vapor with a non-magnetic transition metal including at least two elements selected from the group consisting of ruthenium, rhodium, palladium, and platinum. For example, carbon vapor and particulates of the non-magnetic transition metal are generated by arc discharge between a rod-shaped anode containing carbon and the non-magnetic transition metal, and a rod-shaped cathode opposing to the anode, and carbon nanotubes are deposited on a base portion of the cathode. The arc discharge is performed in a reactor chamber containing inert gas or the mixture of inert gas and hydrogen gas, at a pressure ranging from 50 to 1500 Torr.
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