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Single-Wall Carbon Nanotubes Synthesis by Means of UV Laser Vaporization: Effects of the Furnace Temperature and the Laser Intensity Processing Parameters

Published online by Cambridge University Press:  15 March 2011

N. Braidy ,
M.A. El Khakani  and
G.A. Botton
N. Braidy
Affiliation:
Institut National de la Recherche Scientifique, INRS-Énergie et Matériaux, 1650 Lionel-Boulet, Varennes, PQ, J3X 1S2, Canada
M.A. El Khakani
Affiliation:
Institut National de la Recherche Scientifique, INRS-Énergie et Matériaux, 1650 Lionel-Boulet, Varennes, PQ, J3X 1S2, Canada
G.A. Botton
Affiliation:
Materials Technology Laboratory, CANMET, 568 Booth Street, Ottawa, ON, K1A 0G1, Canada
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Abstract

Carbon single-wall nanotubes (SWNTs) have been successfully synthesized by means of KrF laser vaporization of a Co-Ni-doped graphite pellet in a flowing argon atmosphere. The effects of two key processing parameters, namely the furnace temperature (in the 25-1150 °C range) and the laser intensity (in the 0.8-4.4 x 108 W/cm2 range), on the yield and the structural characteristics of the carbon SWNTs were investigated. By characterizing the obtained deposits by means of transmission electron microscopy and micro-Raman spectroscopy techniques, we were able to identify a threshold temperature as low as ∼550 °C, below which no carbon SWNTs can be grown. The increase of the furnace temperature from 550 to 1150 °C was found to lead not only to a significant increase in the SWNTs yield but also to the formation of larger SWNTs bundles. Raman analysis have also revealed that the diameter distribution peak shifts from ∼1.05 to ∼1.22 nm as the temperature is raised from 550 to 1150 °C. At the highest furnace temperature of 1150 °C, we also found that a minimum laser intensity of about 1.6 x 108 W/cm2 is required to grow carbon SWNTs by means of the KrF laser. Higher laser intensities have resulted in a higher yield of SWNTs with relatively thicker bundles. Moreover, the increase of the laser intensity was found to promote the growth of 1.22 nm-diameter nanotubes to the detriment of thinner carbon nanotubes (1.05 and 1.13 nm-diameters).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V9.31
Copyright
Copyright © Materials Research Society 2002

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References

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