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Carbon nanotubes (CNTs) were prepared by ethylene decomposition on an Fe/Al 2 O 3 catalyst in a fluidized bed reactor. Their gross defects at different growth periods are evaluated by using a combination of SEM, TGA and Raman spectroscopy. The initially grown CNTs have a much lower thermal stability and more defects as compared to the fully-grown ones. The difference in the defects...
The synthesis of carbon nanotubes (CNTs) from ethylene decomposition by Fe/Al 2 O 3 and Fe/Ni/Al 2 O 3 catalysts (Fe:Ni=10:1) is studied. A small amount of nickel introduced into the catalyst can significantly increase the yield of CNTs, but the nanotubes change from straight tubes with concentric parallel carbon sheets to helical tubes of the fish-bone type. Raman...
Preparation of carbon nanotubes (CNTs) by catalytic chemical vapor deposition (CCVD) was conducted using a nano-agglomerate bed of quartz with 44mm inner diameter and 1000mm height in the temperature range 500-650 o C. Ethylene and propylene were used as carbon source materials, and four kinds of catalysts containing oxides of Fe, Cu, and Ni, prepared by co-precipitation method, were used...
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