A Formation Mechanism for Catalytically Grown Helix-Shaped Graphite Nanotubes
- 29 July 1994
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 265 (5172) , 635-639
- https://doi.org/10.1126/science.265.5172.635
Abstract
The concept of a spatial-velocity hodograph is introduced to describe quantitatively the extrusion of a carbon tubule from a catalytic particle. The conditions under which a continuous tubular surface can be generated are discussed in terms of this hodograph, the shape of which determines the geometry of the initial nanotube. The model is consistent with all observed tubular shapes and explains why the formation process induces stresses that may lead to "spontaneous" plastic deformation of the tubule. This result is due to the violation of the continuity condition, that is, to the mismatch between the extrusion velocity by the catalytic particle, required to generate a continuous tubular surface, and the rate of carbon deposition.Keywords
This publication has 12 references indexed in Scilit:
- Catalytic growth of carbon filamentsPublished by Elsevier ,2003
- Filamentous growth of carbon through benzene decompositionPublished by Elsevier ,2002
- The Texture of Catalytically Grown Coil-Shaped Carbon NanotubulesEurophysics Letters, 1994
- The study of carbon nanotubules produced by catalytic methodChemical Physics Letters, 1994
- A review of catalytically grown carbon nanofibersJournal of Materials Research, 1993
- Cobalt-catalysed growth of carbon nanotubes with single-atomic-layer wallsNature, 1993
- Catalytic growth of carbon microtubules with fullerene structureApplied Physics Letters, 1993
- Pentagons, heptagons and negative curvature in graphite microtubule growthNature, 1992
- Preparation of coiled carbon fibers by catalytic pyrolysis of acetylene, and its morphology and extension characteristicsCarbon, 1991
- Filamentous carbon growth on nickel-iron surfaces: The effect of various oxide additivesJournal of Catalysis, 1980