Crystalline Ropes of Metallic Carbon Nanotubes

Medientyp: E-Artikel
Titel: Crystalline Ropes of Metallic Carbon Nanotubes
Beteiligte: Thess, Andreas; Lee, Roland; Nikolaev, Pavel; Dai, Hongjie; Petit, Pierre; Robert, Jerome; Xu, Chunhui; Lee, Young Hee; Kim, Seong Gon; Rinzler, Andrew G.; Colbert, Daniel T.; Scuseria, Gustavo E.; Tománek, David; Fischer, John E.; Smalley, Richard E.
Erschienen: American Association for the Advancement of Science (AAAS), 1996
Erschienen in: Science
Sprache: Englisch
DOI: 10.1126/science.273.5274.483
ISSN: 0036-8075; 1095-9203
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Beschreibung: <jats:p> 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 <jats:sup>−4</jats:sup> 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 <jats:italic>C</jats:italic> <jats:sub>5</jats:sub> <jats:sub> <jats:italic>v</jats:italic> </jats:sub> symmetry and an open edge stabilized by triple bonds. </jats:p>

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