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Formation of Carbon Nanotubes from Methane Decomposition: Effect of Concentration of Fe3O4 on the Diameters Distributions

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Abstract:

Fe3O4 was used to synthesize narrow diameter of carbon nanotubes (CNTs). The effect of concentration of Fe3O4 on the diameters of carbon nanotubes (CNTs) synthesized by methane decomposition at 1000°C was investigated. We used conventional impregnation method to prepare Fe3O4/MgO catalysts. The results show that the concentration of Fe3O4 greatly affects the diameter distributions of produced CNTs. The CNTs formed by Fe3O4/MgO catalysts, with the mole ratio set at 0.25:9.75 and 1:9 had diameter of 3.23 ± 1.71 and 49.04 ± 33.62nm, respectively, showing that a decrease in concentration of Fe3O4 yields smaller diameter and narrower diameter distribution. A growth model explaining tip-growth and base-growth mechanism is proposed for understanding formation of CNTs.

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Periodical:

Advanced Materials Research (Volume 832)

Pages:

62-67

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.832.62

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Online since:

November 2013

Authors:

Wei Wen Liu, Tijjani Adam, Azizan Aziz, Siang Piao Chai, Abdul Rahman Mohamed, U. Hashim

Keywords:

Chemical Vapor Deposition (CVD), Graphite, Impregnation Method, Methane, Nanotubes

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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