Synthesis of Multi-wall Carbon Nanotubes Using Fe/CNTs as Catalyst

The synthesis of multi-wall carbon nanotubes(MWNTs) with the average diameter of 30 nm,using Fe/CNTs as catalyst via the catalytic decomposition of ethylene at 790℃,was reported.The morphologies and purity of CNTs obtained at different temperatures from 700~850℃ as well as the products obtained using Fe/ Al2O3 as catalyst were investigated.SEM,TEM,Raman spectroscopy were used to characterize the catalyst and products.In addition to the same morphology and the accordant diameter like the products obtained from Fe/ Al2O3 catalyst,the yield of CNTs is apparently 100% higher than that using Fe/ Al2O3 as catalyst.Furthermore,no unmanageable oxide support could be observed in the products,which induces the high-purity.