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Type: Artigo de periódico
Title: Liquid carbon, carbon-glass beads, and the crystallization of carbon nanotubes
Author: de Heer, WA
Poncharal, P
Berger, C
Gezo, J
Song, ZM
Bettini, J
Ugarte, D
Abstract: The formation of carbon nanotubes in a pure carbon arc in a helium atmosphere is found to involve liquid carbon. Electron microscopy shows a viscous liquid-like amorphous carbon layer covering the surfaces of nanotube-containing millimeter-sized columnar structures from which the cathode deposit is composed. Regularly spaced, submicrometer-sized spherical beads of amorphous carbon are often found on the nanotubes at the surfaces of these columns. Apparently, at the anode, liquid-carbon drops form, which acquire a carbon-glass surface due to rapid evaporative cooling. Nanotubes crystallize inside the supercooled, glass-coated liquid-carbon drops. The carbon-glass layer ultimately coats and beads on the nanotubes near the surface.
Country: EUA
Editor: Amer Assoc Advancement Science
Rights: fechado
Identifier DOI: 10.1126/science.1107035
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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