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Issue 7, 2014
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Controlled fabrication of porous double-walled TiO2 nanotubes via ultraviolet-assisted anodization

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Abstract

Double-walled TiO2 nanotubes with porous wall morphologies are fabricated by anodization under ultraviolet (UV) irradiation. TiO2 formed by anodization of Ti is activated to generate electrons and holes by UV and the anodization process is influenced by the photo-generated charges. As a consequence, morphologies of the fabricated TiO2 nanotubes can be adjusted by controlling the UV illumination. Double-walled TiO2 nanotubes or single-walled nanotubes can be selectively formed by switching on/off the UV illumination. The thickness of the inner and outer walls of the double-walled nanotubes can be tailored by changing the UV power. Due to their larger surface areas compared to single-walled nanotubes, the porous double-walled nanotubes exhibit an enhanced photo-degradation rate for methylene blue (MB). The mechanism of the porous double-walled TiO2 nanotubes is proposed based on the photoactive semiconducting property of the as-growing TiO2 nanotubes under UV.

Graphical abstract: Controlled fabrication of porous double-walled TiO2 nanotubes via ultraviolet-assisted anodization

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Publication details

The article was received on 05 Nov 2013, accepted on 08 Jan 2014 and first published on 29 Jan 2014


Article type: Paper
DOI: 10.1039/C3NR05894H
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Nanoscale, 2014,6, 3632-3637

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    Controlled fabrication of porous double-walled TiO2 nanotubes via ultraviolet-assisted anodization

    G. Ali, H. J. Kim, J. J. Kim and S. O. Cho, Nanoscale, 2014, 6, 3632
    DOI: 10.1039/C3NR05894H

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