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Formation of oxide nanotube layers on titanium alloys

Hiroaki Tsuchiya 1,  Patrik Schmuki 2,  Junji Nakata 1,  Shinji Fujimoto 1

1. Graduated School of Engineering, Osaka University (OSAKAUNIV), Osaka, Japan
2. University Erlangen-Nürnberg, Inst. for Material Science, Martensstr. 7, Erlangen 91058, Germany

Abstract

We have examined the electrochemical formation of self-organized titanium oxide nanotubes. Key to achieve highly ordered tubes with high aspect ratio is an optimized electrochemical anodization in fluoride containing electrolytes. The morphology of resulting nanotube layers is strongly affected by anodization parameters such as electrolyte pH, viscosity and anodization voltage. Layers consisting of highly ordered titanium oxide nanotubes with a length of over 100 micrometers can be formed by optimizing the local electrochemistry within the tube. The diameters can be also tuned from 10 nm to 200 nm by controlling the anodization conditions. Due to the wide range of applications of titanium oxides, such as solar energy conversion, photocatalysts, wettability and biocompatibility, the nanotubular structures have attracted much scientific interests as well as significant technological interests. We have reported that titanium oxide nanotube layers show higher conversion efficiency than flat titanium oxide layer, can be used as coating for enhanced hydroxyapatite formation to achieve osseointegration to living bone and show extremely enhanced visible photoresponse when nitrogen-doped.

Recently novel nanotubular structure with two discrete sizes and geometries has been reported on titanium alloys – self-organization on two size scales can be achieved by simple anodization. The two-size-scale self-ordering is achieved on single b-type Ti29Nb13Ta4.6Zr alloy where nanotubes with a diameter of approximately 50 nm are satellited by 30 nm nanotubes. The present work will report the formation process of layers consisting of two discrete tubes on the alloy and key factors to achieve the two-size-scale self-ordering will be briefly addressed.
 

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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium B, by Hiroaki Tsuchiya
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-14 16:32
Revised:   2009-06-07 00:44