Abstract
A novel method has been developed for synthesis of aligned carbon nanotubes (CNTs) by simply electrically heating a substrate in organic liquids. Si substrates with a thin Fe film cover were electrically heated to 500–1000°C in organic liquid. Aligned mutiwalled CNTs were grown and stick well on the Si substrates by using methanol and ethanol. The top ends of the nanotubes were closed with seamless caps. Some other shaped CNTs have also been synthesized, in particular, a special kind of coupled CNT of which the structure of one CNT is left hand rotated and the other right hand rotated with bridging chains between them. The growth mechanism of CNTs in organic liquids is proposed to be related to the adsorption and decomposition of organic radicals at the catalytic substrate surface under in-equilibrium thermal and dynamic conditions.
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