Structural study of nitrogen-doping effects in bamboo-shaped multiwalled carbon nanotubes

Jae Won Jang; Cheol Eui Lee; Seung Chul Lyu, Kanti; Tae Jae Lee; Cheol Jin Lee
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2877
Academic Journal
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-sp3 C bonds as well as the deterioration of the crystallinity of the BS-MWNTs. Besides, the N-sp3 C bonds were found to prevail over the N-sp2 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. © 2004 American Institute of Physics.


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