Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 15, Pages 2877-2879Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1697624
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We have investigated nitrogen doping effects on the structure and crystallinity of bamboo-shaped multiwalled carbon nanotubes (BS-MWNTs) by means of x-ray photoemission spectroscopy (XPS) and transmission electron microscopy. By controlling the NH3/C2H2 flow ratio during the chemical vapor deposition, the nitrogen concentrations of 0.4% to 2.4% were obtained. According to the XPS measurements, the increasing nitrogen concentration gave rise to an increase of the N-sp(3) C bonds as well as the deterioration of the crystallinity of the BS-MWNTs. Besides, the N-sp(3) C bonds were found to prevail over the N-sp(2) C bonds above 5% nitrogen concentration. At higher nitrogen concentrations, the BS-MWNTs showed shorter compartment distances, presumably due to the suppressed surface diffusion of carbon on the catalyst particles. (C) 2004 American Institute of Physics.
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