Journal
CARBON
Volume 44, Issue 3, Pages 570-577Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2005.07.043
Keywords
carbon nanotubes; catalytically grown carbon; combustion; Raman spectroscopy
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Vertically well-aligned multi-walled carbon nanotubes (MWNTs) with uniform diameters (similar to 15 mn) were grown on catalytic probes at high yield rates in an inverse diffusion flame (IDF) of a co-flow jet configuration using methane as fuel. Varied parameters investigated included: alloy composition (e.g. Fe, Ni/Cu, Ni/Cr/Fe), sampling positions within the flame structure, and voltage bias applied to the probe substrate. Spontaneous Raman spectroscopy was utilized to determine the local gas-phase temperature, as well as the concentrations of carbon-based precursor species (e.g. CO, C2H2) within the flame structure at specific locations of carbon nanotube (CNT) growth during synthesis. The variation of the aforementioned parameters strongly affects CNT formation, diameter, growth rate, and morphology. (C) 2005 Elsevier Ltd. All rights reserved.
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