Modeling the growth kinetics of anodic TiO2 nanotubes

• Type: Article in International Scientific Journal
• Date: 2015

Authors

A. Apolinário (Author) FCUP; L. Andrade (Author) FEUP; A. Mendes (Author) FEUP; P. Quitério (Author) Other; C. T. Sousa (Author) Other; J. Ventura (Author) Other; J. B. Sousa (Author) Other; J. P. Araújo (Author) Other

Journal

Title: Journal Of Physical Chemistry Letters

Vol. 6 No. 5

Pages: 845-851

ISSN: 1948-7185

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 27 Citations

ISI Web of Science

Scopus - 28 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Associated Projects

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00A-911

DOI: 10.1021/jz502380b

Abstract (EN): The fundamental understanding of the barrier layer (delta(b)) growth in TiO2 nanotubes (NTs) is here established and compared with the classical metal oxidation theory from Mott and Cabrera. The role of delta(b) in the anodization of TiO2 NTs under different applied potentials and times was analyzed using scanning transmission electron microscopy (STEM). Contrary to the well-known case of anodic aluminum oxide, we found that delta(b) of TiO2 NTs progressively grows over time due to the nonsteady anodization regime. We then establish a relation between the phenomenological growth of the barrier layer with time and applied voltage, delta(b)(V,t) using the high-field Mott and Cabrera conduction theory. The developed model was found to be in excellent agreement with the experimental data from both STEM and anodization curves. On the basis of these results, the relationship between delta(b) and the anodization time and potential can now be quantitatively understood.

Language: English

Type (Professor's evaluation): Scientific

Notes: Publicação abrangida pelo Journal Citation Reports 2015

No. of pages: 7