A pile of carbon nanotubes was prepared by placing a small amount of catalyst solution on a substrate, putting the substrate into a furnace, purging the furnace, and heating the substrate under a flow of gaseous carbon source. A pile of carbon nanotubes formed on the substrate. Nanotubes from the pile were spun into a fiber.
STATEMENT REGARDING FEDERAL RIGHTS
 This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.