Self-correlation function for determination of geometrical parameters in Nanoporous Anodic Alumina Films
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Self-correlation functions have been applied to top-view high-resolution scanning electron microscopy micrographs of anodic alumina nanoporous arrays in order to determine their ordering degree and geometrical parameters; as a result, self-correlation images were obtained. These images are formed in the real space and can be used to make quantitative and qualitative surface analysis. The developed method for surface analysis has been applied to three series of porous anodic alumina films grown using sulphuric acid based electrolytes with concentrations of 3, 10, and 20 wt% and applying voltages from 25 down to 5 V. Significant changes in ordering degree, interpore distances, and pore diameters have been observed. In addition, in this study, the existence of an anodization window for self-ordering regimes for each acid concentration used in the electrolytic solution is also revealed.
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