962073.fig.009a
(a)
962073.fig.009b
(b)
962073.fig.009c
(c)
962073.fig.009d
(d)
Figure 9: TEM 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.