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

Figure 1

FESEM images of (a) sample A, (b) sample B, (c) sample C, and (d) sample D. The insets of (a)–(d) show the magnified images for the dashed square areas in (a)–(d). CMCs, CNCs, and CNFs in the insets mean the carbon microcoils, the carbon nanocoils, and the carbon nanofilaments, respectively.