MAO 공정 변수가 TiO2 산화피막의 구조 및 광촉매 특성에 미치는 영향
Influence of MAO Conditions on TiO2 Microstructure and Its Photocatalytic Activity
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TiO2 was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in Na3PO4electrolyte. 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 TiO2,which is able to effectively separate excited electrons and holes at the surface.
Abstract
TiO2 was successfully formed on a Ti specimen by MAO (Micro-Arc-Oxidation) method treated in Na3PO4electrolyte. 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 TiO2,which is able to effectively separate excited electrons and holes at the surface.
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