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Received September 26, 2000
Accepted January 9, 2001
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effects of Bimetallic Catalyst Composition and Growth Parameters on the Growth Density and Diameter of Carbon Nanotubes
School of Chemical Engineering and Technology, Chonbuk National University, Chonju 561-756, Korea 1Jet Propulsion Laboratory, California Institute of Technology-NASA, Pasadena, AC 91107, USA 2Center for Solid State Science, Arizona State University, Tempe, Arizona 85287-1704, USA
nahmks@moak.chonbuk.ac.kr
Korean Journal of Chemical Engineering, March 2001, 18(2), 208-214(7), 10.1007/BF02698461
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Abstract
Multi-wall carbon nanotubes (MWNTs) were synthesized by catalytic decomposition of acetylene over Fe, Ni and Fe-Ni bimetallic catalysts supported on alumina under various controlled conditions. The growth density and diameter of CNTs were markedly dependent on the activation time of catalysts in H2 atmosphere, reaction time, reaction temperature, flow rate of acetylene, and catalyst composition. Bimetallic catalysts were apt to produce narrower diameter of CNTs than single metal catalysts. For the growth of CNTs at 600℃ under 10/100 sccm flow of C2H2/H2 mixture, the narrowest diameter about 20 nm was observed at the reaction time of 1 h for 20Fe : 20Ni : 60Al2O3 catalyst, but at that of 1.5 h for 10Fe : 30Ni : 60Al2O3 catalyst. It was considered that the diameter and density of CNTs decreased with the increase of the growth time mainly due to hydrogen etching. The growth of CNTs followed the tip growth mode.
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