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Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique

Published online by Cambridge University Press:  15 March 2011

Rahul Sen
Affiliation:
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
Hiromichi Kataura
Affiliation:
Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
Yohsuke Ohtsuka
Affiliation:
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
Toshinobu Ishigaki
Affiliation:
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
Shinzo Suzuki
Affiliation:
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
Yohji Achiba
Affiliation:
Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, JAPAN
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Abstract

Gas dynamic and time resolved imaging studies have been performed on the growth of single-walled carbon nanotubes (SWNTs) in the laser ablation process. SWNTs were synthesized by laser ablation of Ni-Co catalyzed graphite targets at 1200°C under argon flow. The effects of the temperature gradient near the target and the gas flow rate were studied in order to understand the effect of gas dynamics over the diameter distribution of SWNTs. The gas flow rate affects the diameter distribution of SWNTs especially when the growth species flow through a large temperature gradient. Scattering images from the growth species at different flow rates was recorded by high-speed video imaging. The results indicate that the velocities of these species are dependent on the gas flow rate but this dependence is evident 30 ms after the laser ablation. These findings are used to estimate the time period for the nucleation and the growth of SWNTs.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique
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Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique
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Effect of Temperature Gradient near the Target and Gas Flow Rate on the Diameter Distribution of Single-Walled Carbon Nanotubes Grown by the Laser Ablation Technique
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