TiO2 Nanotube Arrays of 1000 μm Length by Anodization of Titanium Foil: Phenol Red Diffusion
The Journal of Physical Chemistry C2007Vol. 111(41), pp. 14992–14997
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Maggie Paulose, Haripriya E. Prakasam, Oomman K. Varghese, Lily Peng, Ketul C. Popat, Gopal K. Mor, Tejal A. Desai, Craig A. Grimes
Abstract
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.
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