The effect of catalyst combination ratio on growth of carbon nanotubes over Fe-Co/nanometric SiC by chemical vapor deposition

Bimetallic fe-co catalysts supported on nanometric sic powder were prepared by wet impregnation method and were used to catalyze cnts from decomposition of acetylene at 850 ℃ by tcvd. the effect of fe and co combination ratio in catalytic basis on properties of the end product cnts was investigated using xrd, sem, tem, and raman spectroscopy. the results revealed that iron and cobalt were in oxide and cobalt ferrite forms. the best growth of cnts in the catalyst sample with wt% fe:co:sic=10:10:80 was achieved. it was observed that the ratio of fe:co loading in catalyst-substrate composition was an important factor which could affect the activity of catalytic basis and the characteristics of grown cnts, such as the density and average diameter.