325827.fig.002a
(a)
325827.fig.002b
(b)
325827.fig.002c
(c)
325827.fig.002d
(d)
Figure 2: FESEM images for sample D under the magnification of (a) 1,000, (b) 5,000, and (c) 10,000, and (d) the schematic images for the typical geometries of the nanosized carbon coils.