193201.fig.003a
(a)
193201.fig.003b
(b)
193201.fig.003c
(c)
193201.fig.003d
(d)
Figure 3: SEM images of G-film at different sintering temperature. (a) Sample 4 at 250°C; (b) sample 4 at 300°C; (c) sample 4 at 400°C; (d) sample 5 at 250°C.