Formation of Nanoporous Tin Oxide Layers on Different Substrates during Anodic Oxidation in Oxalic Acid Electrolyte

Figure 10

FE-SEM images of anodic tin oxides after 5 min of anodizing of Sn wire in 0.3 M oxalic acid at 5 V (a), 7 V (b), 9 V (c), and 11 V (d).

(a)

(b)

(c)

(d)