Controlling the diameters in large-scale synthesis of single-walled carbon nanotubes by catalytic decomposition of CH 4

Abstract

High-quality single-walled carbon nanotubes (SWNTs) are synthesized in gram amount on Fe–Mo/MgO catalysts by catalytic decomposition of CH 4 in H 2 or N 2. Raman data reveal that the as-prepared SWNTs have a diameter of about 0.74–1.29 nm. It is found that the diameter of the as-prepared SWNTs can be controlled mainly by adjusting the molar ratio of Fe–Mo versus the MgO support. Several other factors that potentially influence the growth of SWNTs have been studied in detail. The experimental results show that the nature of the catalyst determines the diameter of the as-prepared SWNTs.