| Abstract
| - Few-walled carbon nanotubes (FWNTs) were synthesized by the methane chemical vapor deposition (CVD)method using binary catalysts Co/Mo and Co/W supported on MgO. It was found that Mo was not only apromoter for FWNT growth but also active in the formation of multiwalled carbon nanotubes (MWNTs) inour CVD process. W was found to be a better promoter since it was much less active in producing MWNTimpurities. As a result, the raw FWNT materials prepared from W-containing catalysts were much moreeasily purified than those from Mo-containing catalysts. Scanning electron microscopy, thermogravimetricanalysis, X-ray photoelectron spectroscopy, and transmission electron microscopy were used to characterizeboth raw materials and purified samples.
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