Evolution of iron nanoparticles by controlling oxidation states for carbon nanotubes growth

摘要: Abstract One of the keys to understanding growth mechanism carbon nanotubes (CNTs) is influence oxidation states iron catalyst nanoparticles. We examined effect nanoparticles, which could be controlled by varying electrical conductivity silicon substrate, on CNTs during thermal chemical vapour deposition. Since conductivities substrate proportional its conductivities, thereby catalytic thin film with higher more affected at same temperature. The p -type substrates 1.7 × 10 −3 /Ω cm (substrate U) and 2.8 × 10 2 H), respectively, were used in this work. H allowed that oxidized was reduced metallic particles grew increasingly larger annealing under NH 3 /Ar environment 900 °C. This size increase due tendency agglomerate substrate. By showing substrates, resulting evolution nanoparticles for growth, as a key parameter mechanism.