Growth Mechanism of a Hybrid Structure Consisting of a Graphite Layer on Top of Vertical Carbon Nanotubes

Figure 4

TEM of the carbon structures from 1.9 nm cobalt; (a) low-magnification image showing the presence of a large top layer on top of CNT; arrows indicate nanoparticles at the root of the CNT; (b) large CNT with 17 walls; (c) small CNT with 8 walls; (d) nanoparticles inside the CNTs as indicated by arrows; (e) nanoparticle at the tube root.