Large-scale and low-cost synthesis of single-walled carbon nanotubes by the catalytic pyrolysis of hydrocarbons

Nanocrystalline diamond thin ®lms have been prepared using hot ®lament CVD technique with a mixture of CH 4 /H 2 /Ar as the reactant gas. We demonstrated that the ratio of H 2 to Ar in the reactant gas plays an important role in control of the grain size of diamonds and the growth of the nanocrystalline diamonds. In addition, we have investigated the growth of carbon nanotubes from catalytic CVD using a hydrocarbon as the reactant gas. Furthermore, focused ion beam technique has been developed to control the growth of carbon nanotubes individually. q 2000 Elsevier Science S.A. All rights reserved.

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