Purification method for carbon material containing carbon nanotubes, carbon material produced by the same method, and resin molding, fiber, heat sink, slider, material for field electron emission source, conduction aid for electrode, catalyst support
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United States of America Patent
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Jan 14, 2014
Grant Date -
May 13, 2010
app pub date -
Mar 7, 2008
filing date -
Mar 13, 2007
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Abstract
A purification method for a carbon material containing carbon nanotubes is provided, which satisfies the following requirements: The method should prevent carbon nanotubes from being damaged, broken or flocculated; the method should be capable of removing the catalyst metal and carbon components other than the carbon nanotubes; and the method should be applicable to not only multi-walled carbon nanotubes but also single-walled carbon nanotubes which will undergo significant structural changes when heated to 1400° C. or higher temperatures. The method is characterized by including a carbon material preparation process for preparing a carbon material containing carbon nanotubes by an arc discharge method, using an anode made of a material containing at least carbon and a catalyst metal; and a halogen treatment process for bringing the carbon material into contact with a gas containing a halogen and/or halogen compound.
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