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Self-ordered anodic porous alumina with inter-hole spacing over 1.5 μm
Summary
Researchers fabricated self-ordered anodic porous alumina with inter-hole spacings exceeding 1.5 µm by anodizing in citric acid electrolytes supplemented with phosphoric acid and ethylene glycol mixtures, demonstrating control of pore spacing between 700 nm and 1.8 µm by adjusting anodization conditions.
Self-ordered anodic porous alumina with a long-range ordered hole arrangement having an inter-hole spacing of over 1.5 μm was prepared by anodization in a citric acid electrolyte containing a small amount of phosphoric acid. The inter-hole spacing of the ordered anodic porous alumina could be controlled within a range of 700 nm to 1.8 μm by adjusting the anodization conditions. The use of an electrolyte with a mixture of water and ethylene glycols, especially tetraethylene glycol, was effective for preparing ordered anodic porous alumina with large inter-hole spacings. The obtained anodic porous alumina is suitable for various applications that require highly ordered hole array structures with large inter-hole spacings.
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