The cyclic nature of porosity in anodic TiO2 nanotube arrays

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

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

Revista

Título: Journal of Materials Chemistry A

Vol. 3

Páginas: 3692-3698

ISSN: 2050-7488

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 10 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7