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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.63  Durban  2010




Synthesis of nitrogen-doped carbon nanotubes with layered double hydroxides containing iron, cobalt or nickel as catalyst precursors



Yong CaoI, II; Qingze JiaoII; Yun ZhaoII, *; Gangfu SongI; Peiyong ZhangI

IInstitute of Environment and Municipal Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, People's Republic of China
IISchool of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, People's Republic of China




Nitrogen-doped carbon nanotubes (CNx) were synthesized by the catalytic chemical vapour deposition of ethylenediamine with layered double hydroxides (LDHs) containing iron, cobalt or nickel as catalyst precursors at 650 °C. The catalytically active metal particles were obtained by calcination of LDHs followed by reduction. X-ray diffraction was used to characterize the structures of the precursors and their calcined products. Transmission electron microscopy, X-ray photoelectron spectroscopy and Raman spectroscopy were used to characterize the grown CNx. The results show that the CNx grown with Mg2 Fe-LDH as catalyst precursor have abamboo-like morphology and large diameter, while hollow tubes are obtained with CoMgAl- and NiMgAl-LDH as catalyst precursors. The CNx grown with CoMgAl-LDH have the highest N-doped content and the CNx grown with NiMgAl-LDH have the highest degree of graphitization among these three products.

Keywords: N-doped carbon nanotubes, layered double hydroxides, chemical vapour deposition



Full text available only in PDF format.



This work was conducted with financial support from the Chinese National '863' (No. 2006AA03Z570) fund and Excellent Young Scholars Research Fund of Beijing Institute of Technology (No. c2007YS0404).



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Received 31 March 2009
Revised 13 April 2010
Accepted 7 May 2010



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