title: Temperature and flow rate of NH3 effects on nitrogen content and doping environments of carbon nanotubes grown by injection CVD method.
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.
authors.affiliation: The Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109, USA.
authors.forename: Jiwen
authors.initials: J
authors.lastname: Liu
authors.forename: Scott
authors.initials: S
authors.lastname: Webster
authors.forename: David L
authors.initials: DL
authors.lastname: Carroll