With a prolonged duration of the first anodizing step the order degree of triangular nanoporous lattice, observed after the second anodization, improves considerably.
For the anodizations carried out in 0.5 and 2 M acetic acid, nonzero current was maintained for the duration of anodization, unlike the other concentrations.
The thickness and the porosity of the PS layer were determined by an ellipsometer, as a function of time duration of anodization, and the variation law of the PS growth kinetics is established.
In this study, the effects of the duration of anodization on photocatalytic activity were investigated to improve its performance.
The effects of applied potential (10 70 V), duration of the third step of anodization (15, 30 and 60 min) and the previous usage of the electrolyte on formation of ATO layers were examined at the anodizing temperature of 40 °C.
Based on these results, we concluded that the optimum duration of anodization is 60 min in the present setting because a TiO2 layer showing good photocatalytic activity without any surface cracks could be formed.
The depth of microporous structure was ca. 2 and 7 μm, which was controlled by the duration of anodization.
EIS is suggested to be a convenient method to determine the necessary duration of the etching process during application of the two-step anodization procedure.
Porosity is also influenced by potential, temperature and duration of anodization.
