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Journal of Nanomaterials
Volume 2017 (2017), Article ID 3407352, 9 pages
Research Article

Effect of Gas Flowrate on Nucleation Mechanism of MWCNTs for a Compound Catalyst

1Department of Physics, University of Agriculture, Faisalabad 38040, Pakistan
2Center of Innovative Nanostructures and Nanodevices, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia
3Department of Electrical Engineering, King Saud University, Riyadh, Saudi Arabia

Correspondence should be addressed to S. Shukrullah

Received 12 July 2017; Revised 21 October 2017; Accepted 29 October 2017; Published 14 November 2017

Academic Editor: Andrew R. Barron

Copyright © 2017 S. Shukrullah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Activation of the catalyst particles during a CVD process can be anticipated from the carbon feeding rate. In this study, Fe2O3/Al2O3 catalyst was synthesized with uniformly dispersed iron over alumina support for onward production of multiwalled carbon nanotubes (MWCNTs) in a fluidized bed chemical CVD reactor. The effect of the ethylene flowrate on catalytic activity of the compound catalyst and morphology of the as-grown MWCNTs was also investigated in this study. The dispersed active phases of the catalyst and optimized gas flowrate helped in improving the tube morphology and prevented the aggregation of the as-grown MWCNTs. The flowrates, below 100 sccm, did not provide sufficient reactants to interact with the catalyst for production of defect-free CNT structures. Above 100 sccm, concentration of the carbon precursor did not show notable influence on decomposition rate of the gas molecules. The most promising results on growth and structural properties of MWCNTs were gained at ethylene flowrate of 100 sccm. At this flowrate, the ratio of and intensity peaks () was deliberated about 1.40, which indicates the growth of graphitic structures of MWCNTs.