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Issue 34, 2014
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Magnetic field-assisted electroless anodization: TiO2 nanotube growth on discontinuous, patterned Ti films

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Abstract

We present a magnetic field-assisted oxidation and etching process that transforms Ti thin films on arbitrary substrates into self-organized TiO2 nanotube arrays without the direct application of an anodization voltage between the cathode and the Ti film/substrate. In effect, the Ti film/substrate electrode is at a floating potential determined by the ionic Hall voltage. The development of such a magnetic field-assisted electroless anodization process, frees the anodization technique of forming nanostructured semiconductors and metal oxides from the constraints of substrate conductivity and film continuity imposed by the traditional anodization process, and allows the creation of uniform anodic nanostructures on pre-existing high-aspect ratio patterns as well as on substrates containing both conductive and non-conductive areas. Using magnetic field assisted electroless anodization, we demonstrate the formation of microscale patterns of high quality TiO2 nanotubes from discontinuous Ti films deposited on thermal oxide-coated Si substrates and patterned by a lift-off process.

Graphical abstract: Magnetic field-assisted electroless anodization: TiO2 nanotube growth on discontinuous, patterned Ti films

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Publication details

The article was received on 15 May 2014, accepted on 20 Jun 2014 and first published on 17 Jul 2014


Article type: Communication
DOI: 10.1039/C4TA02448F
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Citation: J. Mater. Chem. A, 2014,2, 13810-13816
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    Magnetic field-assisted electroless anodization: TiO2 nanotube growth on discontinuous, patterned Ti films

    A. Mohammadpour and K. Shankar, J. Mater. Chem. A, 2014, 2, 13810
    DOI: 10.1039/C4TA02448F

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