oa South African Journal of Chemistry - The synthesis of nitrogen-doped multiwalled carbon nanotubes using an Fe-Co/CaCO3 catalyst : research article
|Article Title||The synthesis of nitrogen-doped multiwalled carbon nanotubes using an Fe-Co/CaCO3 catalyst : research article|
|© Publisher:||South African Chemical Institute (SACI)|
|Journal||South African Journal of Chemistry|
|Affiliations||1 University of the Witwatersrand, 2 University of the Witwatersrand, 3 University of the Witwatersrand, 4 University of the Witwatersrand and 5 University of Johannesburg|
|Publication Date||Jan 2012|
|Pages||39 - 11|
|Keyword(s)||Acetonitrile, Carbon nanotubes, CVD synthesis, Fe-Co/CaCO3 catalyst and Nitrogen doping|
A CVD method was used to prepare high-quality nitrogen-doped multiwalled carbon nanotubes(N-MWCNTs) using acetonitrile as the nitrogen and carbon source and acetylene as a carbon source over an Fe-Co/CaCO3 catalyst in the temperature range 700-850 °C. This represents a continuation of earlier work in which Fe-Co on CaCO3 was used to make undoped carbon nanotubes. The effect of synthesis parameters (growth temperature and CH3CN vaporization temperature) on the yield, size, quality, morphology and thermal stability of the N-MWCNTs was studied. The resulting materials were characterized by TEM, SEM, TGA, BET, XPS, CN elemental analysis and Raman spectroscopy. TEM analysis revealed that the nanotubes exhibit bamboo-like structures with rough surfaces and a relatively uniform diameter. The bamboo compartment distance decreased with increase in synthesis temperature due to the increased nitrogen content in N-MWCNTs. The SEM examination showed that at high synthesis temperatures carbon spheres (CSs) with chain-like morphology and large sizes were also formed along with the N-MWCNTs. The XPS and CN elemental analysis revealed that nitrogen atoms were successfully doped into the carbon walls. The amount of nitrogen incorporated in the N-MWCNTs varied with increasing growth time and CH3CN vaporization temperature.
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