962073.fig.008a
(a)
962073.fig.008b
(b)
962073.fig.008c
(c)
962073.fig.008d
(d)
Figure 8: FESEM micrographs of (a) as-synthesized sample A and after heat treatments at (b) 300°C, (c) 500°C, and (d) 700°C for 2 hours.