640428.fig.003a
(a) 1 min 
640428.fig.003b
(b) 5 min
640428.fig.003c
(c) 10 min
640428.fig.003d
(d) 20 min
Figure 3: SEM images of Ag NPs film at various deposition times of (a) 1 min, (b) 5 min, (c) 10 min, and (d) 20 min.