Electrical conductivity of individual carbon nanotubes

Article Abstract:

Different carbon nanotubes (NT) prepared under identical conditions show significant differences in their electrical conductivity. The conductivity of individual NTs is determined by four-probe measurements of NTs made of lithographic tungsten lead deposits. The NTs show metallic, non-metallic and superconducting properties. Changes in temperature produce different abrupt changes in conductivity. This indicates that the geometry of the carbon NTs has a significant effect on their electrical conductivity.

Measurement, Observations, Electrical conductivity

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Graphitic cones and the nucleation of curved carbon surfaces

Article Abstract:

Research into the nucleation and growth of curved carbon structures has used pyrolysis of hydrocarbons to produce an unusual carbon sample. The sample contained only graphitic microstructures with overall disclinations which are multiples of +60 degrees. It was very unusual to find a change in disclination after seeding. Researchers believe that the total disclination, or curvature, is almost always established in the nucleation stage.

Nucleation, Nucleation (Chemistry)

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Opening carbon nanotubes with oxygen and implications for filling

Article Abstract:

A method to modify carbon nanotubes into nanocomposite fibers is presented. The method involves heating in the presence of air and lead metal to opening the carbon nanotube caps, which are invariably present in unmodified nanotubes, and simultaneously filling them with an inorganic phase. The reaction mechanism between the nanotube caps and oxygen during cap removal was described.

Methods, Carbon composites, Materials research

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