Temperature and flow rate of NH3 effects on nitrogen content and doping environments of carbon nanotubes grown by injection CVD method |
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Authors: | Liu Jiwen Webster Scott Carroll David L |
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Institution: | The Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109, USA. |
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Abstract: | Large-scale and vertically aligned nitrogen-doped carbon nanotubes were synthesized by pyrolysis of pyridine with ferrocene as the catalysts under either pure NH3 or a mixture of NH3 and argon atmosphere using injection chemical vapor deposition method. Nitrogen content ranges from 4.8 at. % to 8.8 at. % and changes as a function of growth temperature and the flow rate of NH3. NH3 not only increases the nitrogen content of carbon nanotubes but also increases the proportion of pyridine-like N doping in the carbon nanotubes. It suggests that nitrogen concentration and nitrogen doping environments of carbon nanotubes could be controlled by changing the growth temperature or flow rate of NH3. |
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