TiO2 Nanotube Arrays of 1000 μm Length by Anodization of Titanium Foil:  Phenol Red Diffusion

We report for the first time fabrication of self-aligned hexagonally closed-packed titania nanotube arrays of over 1000 μm in length and aspect ratio ≈10 000 by potentiostatic anodization of titanium. We describe a process by which such thick nanotube array films can be transformed into self-standin...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2007-10, Vol.111 (41), p.14992-14997
Main Authors: Paulose, Maggie, Prakasam, Haripriya E., Varghese, Oomman K., Peng, Lily, Popat, Ketul C., Mor, Gopal K., Desai, Tejal A., Grimes, Craig A.
Format: Article
Language:English
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Summary:We report for the first time fabrication of self-aligned hexagonally closed-packed titania nanotube arrays of over 1000 μm in length and aspect ratio ≈10 000 by potentiostatic anodization of titanium. We describe a process by which such thick nanotube array films can be transformed into self-standing, flat or cylindrical, mechanically robust, polycrystalline TiO2 membranes of precisely controlled nanoscale porosity. The self-standing membranes are characterized using Brunauer−Emmett−Teller surface area measurements, glancing angle X-ray diffraction, and transmission electron microscopy. In initial application, such membranes are used to control the diffusion of phenol red.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp075258r