Geometry-Controlled Carbon Coils by SF₆ Flow Injection Time with Reaction Temperature

Figure 4

FESEM images showing the formation of the carbon microcoils (a) from the wave-like carbon nanofilaments in sample I, (b) from the carbon nanocoils in sample A, and (c) from the untangled carbon microcoils in sample I.

(a)

(b)

(c)