Multi-walled carbon nanotubes have been synthesized through the solid-phase transformation of metal-containing glass-like carbon nanoparticles by heating at temperatures of 800-1000°C.From microscopic observations on the morphologies and structures of the nanotubes and various intermediate objects,it is shown that the transformation occurs by nanoparticles first assembling into wire-like nanostructures,and then transforming into nanotubes via particle-particle coalescence and structural crystallization.
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