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Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media

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Title: Self-ordered nanospike porous alumina fabricated under a new regime by an anodizing process in alkaline media
Authors: Iwai, Mana Browse this author
Kikuchi, Tatsuya Browse this author →KAKEN DB
Suzuki, Ryosuke O. Browse this author
Issue Date: 31-Mar-2021
Publisher: Nature Portfolio
Journal Title: Scientific reports
Volume: 11
Issue: 1
Start Page: 7240
Publisher DOI: 10.1038/s41598-021-86696-z
Abstract: High-aspect ratio ordered nanomaterial arrays exhibit several unique physicochemical and optical properties. Porous anodic aluminum oxide (AAO) is one of the most typical ordered porous structures and can be easily fabricated by applying an electrochemical anodizing process to Al. However, the dimensional and structural controllability of conventional porous AAOs is limited to a narrow range because there are only a few electrolytes that work in this process. Here, we provide a novel anodizing method using an alkaline electrolyte, sodium tetraborate (Na2B4O7), for the fabrication of a high-aspect ratio, self-ordered nanospike porous AAO structure. This self-ordered porous AAO structure possesses a wide range of the interpore distance under a new anodizing regime, and highly ordered porous AAO structures can be fabricated using pre-nanotexturing of Al. The vertical pore walls of porous AAOs have unique nanospikes measuring several tens of nanometers in periodicity, and we demonstrate that AAO can be used as a template for the fabrication of nanomaterials with a large surface area. We also reveal that stable anodizing without the occurrence of oxide burning and the subsequent formation of uniform self-ordered AAO structures can be achieved on complicated three-dimensional substrates.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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