Pyrolytic carbon nanotubes from vapor-grown carbon fibers
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文摘
Carbon nanotubes have been recognized as fascinating materials with nanometer dimensions promising exciting new areas of carbon chemistry and physics. From the viewpoint of fullerene science they also are interesting because they are forms of giant fullerenes. The nanotubes prepared in a dc arc discharge using graphite electrodes at temperatures greater than 3000°C under helium were first reported by Ijima and later by Ebbesen and Ajyayan. Similar tubes, which we call pyrolytic carbon nanotubes (PCNTs), are produced by pyrolyzing hydrocarbons. PCNTs can also be prepared using the same equipment as that used for the production of so called vapor-grown carbon fibres (VGCFs). The VGCFs are micron diameter fibres with circular cross-sections and central hollow cores with diameters ca. a few tens of nanometers. In the paper the authors compare and discuss the structures of PCNTs and VGCFs.