Growth Termination and Multiple Nucleation of Single-Wall Carbon Nanotubes Evidenced by in Situ Transmission Electron Microscopy

摘要: In order to controllably grow single-wall carbon nanotubes (SWCNTs), a better understanding of the growth processes and how they are influenced by external parameters such as catalyst gaseous environment is required. Here, we present direct evidence termination individual SWCNTs successive additional on Co particles supported MgO means environmental transmission electron microscopy. Such in situ observations reveal plethora solid formations at local scale while it happening thereby elucidate multitude configurations resulting from identical synthesis conditions, which should be considered quest for controlled SWCNT growth. Using CO mixture H2 sources, show that terminates with reduced tube–catalyst adhesion strength. Two main reasons cessation proposed: insufficient active species certain amount stress exerted tube–ca...