872597.fig.003a
(a)
872597.fig.003b
(b)
872597.fig.003c
(c)
872597.fig.003d
(d)
Figure 3: Secondary electron images of as-grown ZnO. (a) on silicon (100), (b) on fused silica (SiO2), and (c) and (d) on gold-covered fused silica (Au/SiO2).