Nested interfacial growth of carbon nanotubes catalyzed by hafnium



Carbon nanotubes containing HfC crystals (see Figure) have been synthesized during the dc arc discharge of a Hf-composite graphite electrode. Clear evidence is presented of the Hf-catalyzed growth of the nanotubes based on transmission electron microscope images, and the growth mechanism, which is thought to be completely different to that active in the production of vapor-grown carbon fibers or metal catalyzed nanotubes, is discussed.

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