Journal
CHEMPHYSCHEM
Volume 12, Issue 16, Pages 2995-3001Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201100454
Keywords
catalysts; density functional theory; doping; nanotubes; nitrogen
Funding
- Science Foundation Ireland [08/CE/I1432]
- Tyndall National Access Programme [160]
- Irish Research Council for Science, Engineering and Technology (IRCSET)
- Science Foundation Ireland (SFI) [08/CE/I1432] Funding Source: Science Foundation Ireland (SFI)
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Nitrogen-doped bamboo-structured carbon nanotubes have been successfully grown using a series of cobalt/molybdenum catalysts. The morphology and structure of the nanotubes were analysed by transmission electron microscopy and Raman spectroscopy. The level of nitrogen doping, as determined by X-ray photoelectron spectroscopy, was found to range between 0.5 to 2.5 at.?%. The growth of bamboo-structured nanotubes in the presence of nitrogen, in preference to single-walled and multi-walled nanotubes, was due to the greater binding energy of nitrogen for cobalt in the catalyst compared to the binding strength of carbon to cobalt, as determined by density functional theory.
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