Figure 7.
SEM micrographs of the top views and cross sections of the AAO membranes formed through two-step anodization at 40V and 25 °C for 1 h in the oxalic acid solution with concentrations: (a,d) 0.3 M; (b,e) 0.5 M; and (c,f) 0.7 M [62].
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