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Effect of Carrier Gas on the Growth Rate, Growth Density, and Structure of Carbon Nanotubes

Published online by Cambridge University Press:  21 March 2011

Yoke Khin Yap ,
Vijaya Kayastha ,
Steve Hackney ,
Svetlana Dimovski  and
Yury Gogotsi
Yoke Khin Yap
Affiliation:
Department of Physics, Michigan Technological University, Houghton, MI 49931, USA. Department of Physics, Michigan Technological University, Houghton, MI 49931, USA. Email:ykyap@mtu.edu
Vijaya Kayastha
Affiliation:
Department of Physics, Michigan Technological University, Houghton, MI 49931, USA.
Steve Hackney
Affiliation:
Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI 49931-1295, USA.
Svetlana Dimovski
Affiliation:
Department of Materials Science and Engineering and A. J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USA.
Yury Gogotsi
Affiliation:
Department of Materials Science and Engineering and A. J. Drexel Nanotechnology Institute, Drexel University, Philadelphia, PA 19104, USA.
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Abstract

We attempt to understand the fundamental factors that determine the growth rate of carbon nanotubes. In a series of experiments on growing multiwall carbon nanotubes (MWNTs) by thermal chemical vapor deposition, we found that the addition of carrier gas and the type of carrier gas can change the growth rate, growth density, and structures of MWNTs. We explain these results based on the dissociative adsorption of C2H2 on Fe nanoparticles and the vapor-liquid-solid (VLS) growth model. Finally, high-density, vertically aligned MWNTs were grown when decomposition and segregation rates of carbon were balanced.

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