Controlling anodization time to monitor film thickness, phase composition and crystal orientation during anodic growth of TiO2 nanotubes

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
Electrochemistry Communications, Volume 134
Abstract
Anodic TiO2 nanotube (TNT) films show promises for photon-driven catalytic, electricity storage and chemical processes. The film thickness of anodic TNT is known to affect its performance in optical and electronic applications. Also, factors affecting the morphology and dimensions of anodic TNT films are rather well-known. However, the knowledge on phase transition and composition in the growth of anodic TiO2 from the titanium metal is very limited. In this work, the anodization time is controlled in intervals of 10, 60, 300, 1000, 2000 and 5000 s to investigate its effect on phase composition and transition, and the morphology of the anodic TNT during the growth process. Even though the mechanism of anodic TNT formation is still under debate, the scanning electron microscope results support bottom-up tube growth with evidence of a compact layer. It was also found that the Richards growth model is applicable to correlate growth time and film thickness. Finally, the phase transition, crystal orientation and pore formation during the anodic process are further discussed.
Description
Funding Information: This work has been supported by the China Scholarship Council (CSC), No. 201706250038; Aalto University, School of Science Project T30404; the Start-up Package of T10108 Professorship offered by Aalto University to Prof. Yongdan Li . Publisher Copyright: © 2021 The Author(s)
Keywords
Anodic oxidation, Growth curve, Phase transition and composition, Sigmoidal growth model, TiO nanotube arrays
Other note
Citation
Hou, X, Lund, P D & Li, Y 2022, ' Controlling anodization time to monitor film thickness, phase composition and crystal orientation during anodic growth of TiO 2 nanotubes ', Electrochemistry Communications, vol. 134, 107168 . https://doi.org/10.1016/j.elecom.2021.107168