954869.fig.005a
(a)
954869.fig.005b
(b)
954869.fig.005c
(c)
954869.fig.005d
(d)
Figure 5: SEM image of SnO2 nanoparticles synthesized by sol-gel method (a) as prepared, (b) sintered at 573 K, (c) sintered at 873 K (d), and sintered at 1073 K.