Nanosize pore arrays, which have been prepared by the self-organization process of aluminium anodic oxidation, were investigated quantitatively using fast Fourier transformation analysis of scanning electron microscopy micrographs. The results show that the temperature influences the pore domain size and the best self-ordering configuration is obtained at an optimum condition of temperature. The largest domain size was observed for samples anodized around 15°C to 17°C, using 0.3 M oxalic acid. It is also found that the optimum temperature for self-organization of pore oxidation changes in accordance with the concentration of electrolyte.
High-density structures with well-ordered nanohole arrays have been obtained by the self-ordering growth of nanopores using 25–40 V anodization voltages in a sulfuric–oxalic acid mixture. In each anodization voltage, two types of electrolyte mixture were used with low and high sulfuric concentrations at a constant pH value. The ordering and regularity of a nanohole array was quantified by analysis of fast Fourier transformations of scanning electron and atomic force microscope images. The results show that the long range ordering of nanohole array is superior for high sulfuric concentration, while regularity is more pronounced for low sulfuric concentration. The interpore distance in the oxalic–sulfuric mixture is higher in the case of low sulfuric concentration. It is almost proportional to 2.6 nm V−1 and 2.5 nm V−1 for the electrolyte mixture with low and high sulfuric concentrations, respectively. While the porosity is nearly 10% for samples made in standard sulfuric and oxalic acid using 25 V and 40 V anodization voltage, respectively, it increases up to 50% for the sample made with 37.5 V in an oxalic–sulfuric mixture.
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