Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation of Nano Titania Sols and Thin Films added with Transition Metal Elements

전이금속원소들이 첨가된 나노 티타니아 졸 및 코팅막 제조

  • Lee K. (Sejong Advanced Institute of Nano Technologies/Dept. of Nano Science and Technology, Sejong University) ;
  • Lee N. H. (Sejong Advanced Institute of Nano Technologies/Dept. of Nano Science and Technology, Sejong University) ;
  • Shin S. H. (Nano Surface Technology Team, Korea Institute of Industrial Technology) ;
  • Lee H. G. (Department of Advanced Materials Engineering, Korea Polytechnic University) ;
  • Kim S. J. (Sejong Advanced Institute of Nano Technologies/Dept. of Nano Science and Technology, Sejong University)
  • 이강 (세종대학교 나노기술연구소/나노공학과) ;
  • 이남희 (세종대학교 나노기술연구소/나노공학과) ;
  • 신승한 (한국생산기술연구원 나노표면기술팀) ;
  • 이희균 (한국산업기술대학교 신소재공학과) ;
  • 김선재 (세종대학교 나노기술연구소/나노공학과)
  • Published : 2004.09.01
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Abstract

The photocatalytic performance of $TiO_2$ thin films coated on porous alumina balls using various aqueous $TiOCl_2$ solutions as starting precursors, to which 1.0 $mol\%$ transition metal ($Ni^{2+},\;Cr^{3+},\;Fe^{3+},\;Nb^{3+},\;and\;V^{5+}$) chlorides had been already added, has been investigated, together with characterizations for $TiO_2$ sols synthesized simultaneously in the same autoclave through hydrothermal method. The synthesized $TiO_2$ sols were all formed with an anatase phase, and their particle size was between several nm and 30 nm showing ${\zeta}-potential$ of $-25{\sim}-35$ mV, being maintained stable for over 6 months. However, the $TiO_2$ sol added with Cr had a much lower value of -potential and larger particle sizes. The coated $TiO_2$ thin films had almost the same shape and size as those of the sol. The pure $TiO_2$ sol showed the highest optical absorption in the ultraviolet light region, and other $TiO_2$ sols containing $Cr^{3+},\;Fe^{3+}\;and\;Ni^{2+}$ showed higher optical absorption than pure sol in the visible light region. According to the experiments for removal of a gas-phase benzene, the pure $TiO_2$ film showed the highest photo dissociation rate in the ultraviolet light region, but in artificial sunlight the photo dissociation rate of $TiO_2$ coated films containing $Cr^{3+},\;Fe^{3+}\;and\;Ni^{2+}$ was measured higher together with the increase of optical absorption by doping.

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References

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