The cyclic nature of porosity in anodic TiO2 nanotube arrays

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

Authors

Quiterio, P (Author) Other; Apolinário, A. (Author) FCUP; Sousa, CT (Author) FCUP; Costa, JD (Author) Other; ventura, j. (Author) FCUP; araujo, j. p. (Author) FCUP

Journal

Title: Journal of Materials Chemistry A

Vol. 3

Pages: 3692-3698

ISSN: 2050-7488

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-00A-5XJ

DOI: 10.1039/c4ta04607b

Abstract (EN): Precise shape engineering and physico-chemical properties of TiO2 nanotubes (NTs) obtained by electrochemical anodization are key-issues that enable their practical applications. This work describes the general features that govern the porosity and geometrical parameters (pore diameter, inter-pore distance, wall and barrier layer thickness) of self-ordered TiO2 NTs. We observed a complex cyclic porosity trend during constant voltage anodizations. We propose that these porosity changes are the outcome of the microscopic mechanisms behind NT formation and growth, aligned with non-equilibrium oxidation-dissolution processes at their bottoms. The self-ordered regime of TiO2 NTs was found for porosity values in the range of 5.0% to 5.6%. Finally, a detailed analysis of the anodization curves enabled us to extract significant and comprehensive information on the nanotubes' organization mechanisms during the growth process.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7