Methods for producing and using catalytic substrates for carbon nanotube growth
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United States of America Patent
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Issued Date -
Sep 29, 2005
app pub date -
May 12, 2005
filing date -
Sep 17, 2003
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Abandoned
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Abstract
A catalyst material for carbon nanotube synthesis includes a uniform dispersion of host particles on a substrate. The host particles themselves include catalyst nanoparticles that are effective to catalyze nanotube syntheses reactions and provide nucleation sites. Methods for preparing a catalyst material includes co-sputtering a catalytic species and a host species to directly form the catalyst material. Methods for synthesizing generally aligned nanotubes are also provided. In these methods host particles comprise alumina and the catalyst nanoparticles comprise iron. Also in these methods nanotube synthesis is achieved in an atmosphere including a carbon-containing gas and water vapor.
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