Low-Cost Nanostructured Coating of Anodic Aluminium Oxide Synthesized in Sulphuric Acid as Electrolyte

The anodic oxidation of aluminium is an electrochemical technique that allows obtaining nanostructures with easily adjustable morphology depending on the synthesis variables, for its application in medicine, engineering, biotechnology, electronics, etc. In this work, low-cost aluminium oxide nanostructured films were synthesized and morphologically characterized using two anodization steps in sulphuric acid, varying the concentration and temperature of the electrolyte and anodization voltage. The order of the porous matrix, pore diameter, interpore distance, pore density, thickness, and porosity were measured and statistically analyzed. The results showed that under the proposed conditions it is possible to synthesize low-cost nanoporous aluminium oxide films, with a short-range ordering, being the best ordering conditions 10 degrees C and 0.3 M sulphuric acid at 20 V and 5 degrees C and 2 M sulphuric acid at 15 V. Furthermore, it was determined that the pore diameter and the interpore distance vary proportionally with the voltage, that the pore density decreases with the voltage and increases with the concentration of the electrolyte, and that the thickness of the oxide film increases with electrolyte concentration, temperature, and anodization voltage.

Automated summary

The anodic oxidation of aluminium is an electrochemical technique that can be used to obtain low-cost nanoporous aluminium oxide films with varied morphology depending on synthesis variables. The best ordering conditions were found to be using two anodization steps in sulphuric acid at 10 degrees C and 0.3 M concentration, as well as at 5 degrees C and 2 M concentration. The pore diameter, interpore distance, and thickness of the oxide film were found to vary proportionally with changes in the anodization voltage.