Journal
ELECTROCHIMICA ACTA
Volume 156, Issue -, Pages 235-243Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.12.171
Keywords
Anodizing; Etidronic Acid; Anodic Porous Alumina; Self-Ordering; Structural Color
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Funding
- Nanotechnology Platform Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- Japan Society for the Promotion of Science (JSPS) KAKENHI
- Toyota Physical & Chemical Research Institute Scholars
- Grants-in-Aid for Scientific Research [24686080] Funding Source: KAKEN
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Highly ordered anodic porous alumina with a large-scale cell diameter was successfully fabricated via anodizing in a new electrolyte, etidronic acid (1-hydroxyethane-1,1-diphosphonic acid). High-purity aluminum specimens were anodized in a 0.3 M etidronic acid solution under constant current density and voltage conditions. Etidronic acid anodizing at 210 to 270 V at the appropriate temperature caused the anodic porous alumina to exhibit self-ordering behavior, and periodic nanostructures measuring 530 to 670 nm in cell diameter were fabricated on the aluminum substrate. The self-ordering voltage and the corresponding cell diameter could be increased without burning by systematically increasing the stepwise voltage. Two-step etidronic acid anodizing without nanoimprinting can easily yield the formation of highly ordered anodic porous alumina with a large-scale cell diameter. A submicrometers-cale dimple array fabricated via etidronic acid anodizing and subsequent selective oxide dissolution gave rise to bright structural color with a rainbow distribution. (C) 2015 Elsevier Ltd. All rights reserved.
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