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Published January 16, 2006 | Published
Journal Article Open

Growth of aligned carbon nanotubes on carbon microfibers by dc plasma-enhanced chemical vapor deposition


It is shown that unidirectionally aligned carbon nanotubes can be grown on electrically conductive network of carbon microfibers via control of buffer layer material and applied electric field during dc plasma chemical vapor deposition growth. Ni catalyst deposition on carbon microfiber produces relatively poorly aligned nanotubes with significantly varying diameters and lengths obtained. The insertion of Ti 5 nm thick underlayer between Ni catalyst layer and C microfiber substrate significantly alters the morphology of nanotubes, resulting in much better aligned, finer diameter, and longer array of nanotubes. This beneficial effect is attributed to the reduced reaction between Ni and carbon paper, as well as prevention of plasma etching of carbon paper by inserting a Ti buffer layer. Such a unidirectionally aligned nanotube structure on an open-pore conductive substrate structure may conveniently be utilized as a high-surface-area base electrodes for fuel cells, batteries, and other electrochemical and catalytic reactions.

Additional Information

©2006 American Institute of Physics. (Received 12 August 2005; accepted 22 November 2005; published online 18 January 2006) The authors acknowledge the support of the work by NSF-NIRTs under Grant Nos. DMI-0210559 and DMI-0303790, and University of California Discovery Fund under Grant No. ele02-10133/Jin.

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August 22, 2023
October 16, 2023