Journal
ELECTROCHIMICA ACTA
Volume 190, Issue -, Pages 471-479Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.12.162
Keywords
Anodizing; Porous Alumina; Phosphonic Acid; Self-ordering; Nanostructure
Categories
Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- Light Metal Educational Foundation, Japan
- Sumitomo Foundation, Japan [151181]
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Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical anodizing in a new electrolyte, phosphonic acid (H3PO3). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and anodizing time. Phosphonic acid anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO32 anions originated from the electrolyte were incorporated into the porous oxide during anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO32 anions, and a thin inner layer without anions was constructed via phosphonic acid anodizing. (C) 2015 Elsevier Ltd. All rights reserved.
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