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Author(s): A. Apolinário
C. T. Sousa
J. Ventura
L. Andrade
A. Mendes
J. P. Araújo
Title: Tailoring the Ti surface via electropolishing nanopatterning as a route to obtain highly ordered TiO2 nanotubes
Issue Date: 2014
Abstract: Highly ordered TiO2 nanotubes (NTs) were synthesized by the electrochemical anodization of Tifoils subjected to electropolishing (EP) pre-treatment. We found that the Ti surface roughnessplays an important role in the onset of pore nucleation in enhancing the local focusing effect ofthe electrical field. Additionally, EP induces the formation of dimple structures on the metalsurface, which can work as a pre-pattern prior to anodization. These shallow ripples lead to apreferentially ordered pore nucleation, offering an organizational improvement of the anodicoxide NTs. We found that, depending on the EP applied potential, the roughness and the spatialperiod of the ripple-like structures varies from 82 nm and from 12230 nm, respectively. Suchtuning allowed us to focus on the influence of the initial Ti pre-surface topography features onthe NTs length, organization, and hexagonal arrangement quality, as well as diameter anddensity. Our results show that an EP under 10 V is the most suitable to obtain a small Ti surfaceroughness, the largest NT length (40% enhancement), and the effective improvement of theordered hexagonal NTs arrays over larger areas. Furthermore, the NTs dimensions (porediameters and density) were also found to depend on the initial Ti surface topography. The use ofoptimized EP allows us to obtain highly hexagonal self-ordered samples at a reduced timeand cost.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/COMISSÃO EUROPEIA/7.º Programa-Quadro de IDT/321315/Building Integrated Dye Sensitized Solar Cells/BI-DSC
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/107990/2008/Células fotoelectroquímicas para produção de hidrogénio a partir de energia solar/H2Solar
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional
FEUP - Artigo em Revista Científica Internacional

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