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Ex Situ Evidence for the Role of a Fluoride-Rich Layer Switching the Growth of Nanopores to Nanotubes: A Missing Piece of the Anodizing Puzzle

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/72473

Title: Ex Situ Evidence for the Role of a Fluoride-Rich Layer Switching the Growth of Nanopores to Nanotubes: A Missing Piece of the Anodizing Puzzle
Authors: Shahzad, Khurram Browse this author
Kowalski, Damian Browse this author
Zhu, Chunyu Browse this author
Aoki, Yoshitaka Browse this author
Habazaki, Hiroki Browse this author →KAKEN DB
Keywords: anodizing
iron oxide nanotubes
anodic oxide
fluoride-rich-layer
Issue Date: Feb-2018
Publisher: Wiley-Blackwell
Journal Title: ChemElectroChem
Volume: 5
Issue: 4
Start Page: 610
End Page: 618
Publisher DOI: 10.1002/celc.201701103
Abstract: Anodizing involves a high-voltage electrochemical conversion process that forms barrier-type oxide layers or self-organized nanoporous/nanotubular structures. So far, Al2O3-like nanopores and TiO2-like nanotubes could be successfully synthesized on many metals and alloys. The proposed models of anodic oxide nanotubes growth, however, sacrifice from lack of evidence of the transition from nanopores to nanotubes. The present study demonstrates a missing piece of this anodizing puzzle, which is responsible for the formation of nanotubes in fluoride-containing organic electrolytes. For this purpose, we choose an anodic oxide formed on iron, as a model case, because both nanotubes and nanopores can be formed and slow kinetics of transition between those two forms allows us to observe, ex situ, a fluoride-rich-layer upon nanopores/nanotubes transition. The compositional fingerprints of this transition shed a light on the general mechanism of nanotubes growth in fluoride-containing electrolytes.
Rights: This is the peer reviewed version of the following article: ChemElecroChem, 5(4), 610-618pp., 2018, which has been published in final form at https://doi.org/10.1002/celc.201701103. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Type: article (author version)
URI: http://hdl.handle.net/2115/72473
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)

Submitter: 幅崎 浩樹

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