Iron–cobalt catalysts synthesized by a reverse micelle impregnation method for controlled growth of carbon nanotubes |
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| Authors: | Sabelo D Mhlanga Neil J Coville |
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| Affiliation: | DST/NRF Centre of Excellence in Strong Materials and Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, P.O. Wits, 2050, South Africa;Cambridge University, UK;Waseda University, Japan;Ulm University, Germany;North Carolina State University, USA |
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| Abstract: | Fe–Co bimetallic metals supported on CaCO3 support have been prepared using three different methods for the preparation of the catalysts; wet impregnation (IMP), deposition–precipitation (DP) and reverse micelle impregnation (RM). By careful choice and optimization of CVD reaction conditions and catalyst preparation procedures, we have tailored the nanofabrication of CNTs using 5 wt.% Fe–Co/CaCO3. High yields of ‘clean’ MWNTs with near 100% selectivity and excellent reproducibility were obtained (1215% and 835% yields for the IMP and DP methods respectively). The RM technique enabled more precise control over the size of the CNTs and a narrower diameter distribution (3–5 nm i.d. and 10–15 nm o.d.) was obtained. |
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