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

Figure 3

TEM of the carbon structures from 1.1 nm cobalt (top row, images (a), (b), (c)) and 1.3 nm nickel (bottom row, images (d) and (e)); (a) CNT at low magnification; (b) large CNT with 16 walls (b) small CNT with 6 walls; (d) carbon top layer at the CNT’s tip; numerous particles inside the CNT highlighted by arrows; (e) CNT with a particularly large particle inside.