130716.fig.003a
(a)
130716.fig.003b
(b)
130716.fig.003c
(c)
130716.fig.003d
(d)
130716.fig.003e
(e)
130716.fig.003f
(f)
Figure 3: SEM micrographs of AAO films (sample A) at various concentrations: (a) 0.1 M, (b) 0.2 M, (c) 0.3 M, (d) 0.4 M, (e) 0.5 M, and (f) 0.6 M. After anodic oxidation, pore-widening treatment was performed in 6 wt% H3PO4 at 30°C.