Effect of gas pressure on the growth and structure of carbon nanotubes by chemical vapor deposition |
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Authors: | WZ Li JG Wen Y Tu ZF Ren |
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Institution: | (1) Department of Physics, Boston1 College, 140 Commonwealth Avenue, Chestnut Hill, MA 02467, USA, US |
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Abstract: | The effect of gas pressure on the structure of carbon nanotubes (CNTs) has been systematically investigated in the chemical
vapor deposition process. The yield of CNTs (defined as the weight ratio of CNTs vs. catalyst) increases significantly with
the gas pressure, reaches 600% at 600 Torr, then decreases with further increase of gas pressure. At low reacting gas pressure
the CNTs have completely hollow cores, whereas at high pressure the CNTs have a bamboo structure. The density of the compartments
in the bamboo-structured CNTs increases dramatically with the increase of the gas pressure. This result shows that the structure
and yield of carbon nanotubes are strongly affected by the growth gas pressure.
Received: 10 May 2001 / Accepted: 10 May 2001 / Published online: 20 June 2001 |
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Keywords: | PACS: 81 07 De 81 15 Gh 61 46 +w 81 05 Tp 68 37 -d |
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