Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Influence of MAO Conditions on TiO2 Microstructure and Its Photocatalytic Activity

MAO 공정 변수가 TiO2 산화피막의 구조 및 광촉매 특성에 미치는 영향

  • Kim, Jeong-Gon (Department of Materials Science & Engineering, University of Incheon) ;
  • Kang, In-Cheol (Technology Convergence Center, SongdoTechnopark)
  • 김정곤 (인천대학교 신소재공학부) ;
  • 강인철 ((재)송도테크노파크 융복합산업지원센터)
  • Received : 2012.02.26
  • Accepted : 2012.03.30
  • Published : 2012.06.28
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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

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