Effects of bimetallic catalyst composition and growth parameters on the growth density and diameter of carbon nanotubes |
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| Authors: | A. K. M. Fazle Kibria Young Hwan Mo Min Hee Yun Moon J. Kim Kee Suk Nahm |
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| Affiliation: | (1) School of Chemical Engineering and Technology, Chonbuk National University, 561-756 Chonju, Republic of Korea;(2) Jet Propulsion Laboratory, California Institute of Technology-NASA, 91107 Pasadena, AC, USA;(3) Center for Solid State Science, Arizona State University, 85287-1704 Tempe, Arizona, USA |
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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 ‡C under 10/100 seem 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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| Keywords: | Carbon Nanotubes Fe-Ni/A12O3 Catalyst CVD Acetylene Growth Density |
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