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Science 26 July 1996: Vol. 273. no. 5274, pp. 483 - 487 DOI: 10.1126/science.273.5274.483
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Reports
Crystalline Ropes of Metallic Carbon Nanotubes
Andreas Thess,
Roland Lee,
Pavel Nikolaev,
Hongjie Dai,
Pierre Petit,
Jerome Robert,
Chunhui Xu,
Young Hee Lee,
Seong Gon Kim,
Andrew G. Rinzler,
Daniel T. Colbert,
Gustavo E. Scuseria,
David Tománek,
John E. Fischer,
Richard E. Smalley
*
Fullerene single-wall nanotubes (SWNTs) were produced in yields of
more than 70 percent by condensation of a laser-vaporized
carbon-nickel-cobalt mixture at 1200°C. X-ray diffraction and
electron microscopy showed that these SWNTs are nearly uniform in
diameter and that they self-organize into "ropes," which consist
of 100 to 500 SWNTs in a two-dimensional triangular lattice with a
lattice constant of 17 angstroms. The x-ray form factor is consistent
with that of uniformly charged cylinders 13.8 ± 0.2 angstroms in
diameter. The ropes were metallic, with a single-rope resistivity of
<10-4 ohm-centimeters at 300 kelvin. The uniformity of
SWNT diameter is attributed to the efficient annealing of an initial
fullerene tubelet kept open by a few metal atoms; the optimum diameter
is determined by competition between the strain energy of curvature of
the graphene sheet and the dangling-bond energy of the open edge, where
growth occurs. These factors strongly favor the metallic (10,10) tube
with C5v symmetry
and an open edge stabilized by triple bonds.
A. Thess, P. Nikolaev, H. Dai, C. Xu, A. G. Rinzler, D. T. Colbert, G. E. Scuseria, R. E. Smalley, Center for Nanoscale Science
and Technology, Rice Quantum Institute, and Departments of Chemistry
and Physics, Mail Stop 100, Rice University, Post Office Box 1892, Houston, TX 77251, USA.
R. Lee and J. E. Fischer, Department of Materials Science and
Engineering and Laboratory for Research on the Structure of Matter,
University of Pennsylvania, Philadelphia, PA 19104-6272, USA.
P. Petit and J. Robert, Institut Charles Sadron, 6 rue Boussingault,
67000 Strasbourg, France.
Y. H. Lee, S. G. Kim, D. Tománek, Department of Physics and
Astronomy, Michigan State University, East Lansing, MI 48824-1116,
USA.
*
To whom correspondence should be addressed.
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