Abstract
Multiwall carbon nanotubes (MW-CNTs) have been prepared in a microwave-plasma enhanced CVD (MW-PECVD) tubular system at a low temperature ∼300 °C from CH4–H2 plasma with the addition of CO2 using as a week oxidant to selectively remove the amorphous carbon component and promote the CNT growth. CNTs are typically with outer diameter ∼20 nm, inner diameter ∼10 nm of several μm in length and are grown via the tip growth process, bearing Fe catalyst nano-particles at the tip. The presence of CO2 as a weak oxidant in the plasma may influence in reducing the size of the support catalyst nano-particles and narrowing the CNTs with aligned multiwalls.
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