Abstract
The effect of W and W2C on the synthesis of multi-walled carbon nanotubes (MWCNTs) by hot-filament-assisted chemical vapor deposition (HFCVD) using Co particles as a catalyst was examined. W or W2C was vacuum-evaporated onto Co particles supported by zeolite and used as a catalyst in CNT synthesis. Methanol was used as a carbon source. Synthesis of CNTs was carried out at about 400°C. The density of the MWCNTs synthesized using only Co as a catalyst was the lowest, and was sequentially higher when using Co combined with W (Co + W) and Co combined with W2C (Co + W2C). The mechanism of the enhancement of CNT growth upon the addition of W or W2C was considered.
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