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http://dx.doi.org/10.4150/KPMI.2012.19.3.196

Influence of MAO Conditions on TiO2 Microstructure and Its Photocatalytic Activity  

Kim, Jeong-Gon (Department of Materials Science & Engineering, University of Incheon)
Kang, In-Cheol (Technology Convergence Center, SongdoTechnopark)
Publication Information
Journal of Powder Materials / v.19, no.3, 2012 , pp. 196-203 More about this Journal
Abstract
$TiO_2$ was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in $Na_3PO_4$ electrolyte. This study deals with the influence of voltage and working time on the change of surface microstructure and phase composition. Voltage affected the forming rate of the oxidized layer and surface microstructure where, a low voltage led to a high surface roughness, more holes and a thin oxidized layer. On the other hand, a high voltage led to more dense surface structure, wider surface holes, a thick layer and fewer holes. Higher voltage increases photocatalytic activity because of better crystallization of the oxidized layer and good phase composition with anatase and rutile $TiO_2$, which is able to effectively separate excited electrons and holes at the surface.
Keywords
Titanium; Surface oxidation; MAO(Micro-Arc-Oxidation); Photocatalytic activity;
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