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Variation of Size and Alignment in Carbon Nanotubes by Changes of Growth Condition

Published online by Cambridge University Press:  02 July 2020

Paula P. Provencio
Affiliation:
Sandia National Laboratories, Nanostructures and Advanced Materials, Albuquerque, New Mexico, 87185-1421, USA
Michael P. Siegal
Affiliation:
Sandia National Laboratories, Nanostructures and Advanced Materials, Albuquerque, New Mexico, 87185-1421, USA
Donald L. Overmyer
Affiliation:
Sandia National Laboratories, Nanostructures and Advanced Materials, Albuquerque, New Mexico, 87185-1421, USA
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Abstract

Carbon nanotubes have previously been grown on Ni coated glass, aligned vertical to the substrate over a multi-centimeter square area1. Under vacuum, the aligned nanotubes were grown below 666° C (strain point of the best display glass) by plasma-enhanced hot filament, chemical vapor deposition. It was found, the size and alignment of the nanotubes could be varied by changing the dwell time and the thickness of the catalytic Ni layer by plasma etching. in more recent, ongoing studies, the size of carbon nanotubes is varied by changing the growth temperature and dwell time under acetylene/nitrogen atmosphere using chemical vapor deposition onto W and Ni coated Si.

Multiwall carbon nanotube films are grown using a thermally-activated chemical vapor deposition process. Thin Ni catalyst layers are sputtered onto W-coated Si(100) and reduced in a 600°C CO anneal. Nanotubes then grow at temperatures ranging from 630 - 790°C in an acetylene/nitrogen mixture.

Type
Novel Microscopy Assisted Ceramic Developments in Materials Scienceand Nanotechnology (Organized by P. Gai and J. Lee)
Copyright
Copyright © Microscopy Society of America 2001

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References

1.)Ren, Z.F. et al., Science 282 (1998) 1105.CrossRefGoogle Scholar
2.) This research is supported by Sandia National Laboratories, a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the U.S. Department of Energy under contract DE-AC04-94AL85000.Google Scholar