Structural characterisation of carbon nanotubes in the presence of aNi catalyst

Figure 1 (a,b) Examples ofnanotubes grown at 700°C for 10 and 20 minutes, respectively. (c) Nickel catalyst trapped in the hollow core of a nanotube, indicating a highly mobile state has been attained (700°C, 2 hrs). (d) Nanotube with faceted (x) and encapsulated (y) Ni particles at opposite ends (700°C, 20 min).