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Single-walled carbon nanotubes synthesized by the pyrolysis of pyridine over catalysts

Published online by Cambridge University Press:  03 March 2011

J. Liu ,
D.L. Carroll ,
J. Cech  and
S. Roth
J. Liu
Affiliation:
The Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109
D.L. Carroll*
Affiliation:
The Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, North Carolina 27109
J. Cech
Affiliation:
Max-Planck-Institute for Solid State Research, 70569 Stuttgart, Germany
S. Roth
Affiliation:
Max-Planck-Institute for Solid State Research, 70569 Stuttgart, Germany
*
a) Address all correspondence to this author. e-mail: carroldl@wfu.edu
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Abstract

Single-walled carbon nanotubes (SWNTs) were successfully synthesized by pyrolysis of pyridine over MgO supported Fe–Mo or Co–Mo catalysts in the presence of pure H2 or a mixture of H2 and NH3 atmospheres. The average diameters of SWNTs are ∼1.5 and ∼3 nm for pure H2 and the H2 and HN3 mixture, respectively. Scanning tunneling spectroscopy (STS) studies show that the SWNTs grown in both atmospheres are doped with nitrogen substituted into the lattice in a pyridine-type structure. This results in a donor feature in the local density of states with an energy that depends on the nitrogen doping concentration.

Keywords

Chemical vapor deposition (CVD)Scanning transmission electron microscopy (STEM)
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 11 , November 2006 , pp. 2835 - 2840
Copyright
Copyright © Materials Research Society 2006

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