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Photoelectrical Conductivity and Photodegradation Properties of $TiO_2$ and Ag Sputtered $TiO_2$ Plasma Spraying Coatings

$TiO_2$ 및 Ag 스퍼터링-$TiO_2$ 플라즈마 용사피막의 광전류 및 광분해 특성

  • Kang, Tae-Gu (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Jang, Yong-Ho (Korea Electrotechnology Research Institute) ;
  • Park, Kyeung-Chae (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 강태구 (경북대학교 공과대학 금속신소재공학과) ;
  • 장용호 (한국전기연구원) ;
  • 박경채 (경북대학교 공과대학 금속신소재공학과)
  • Published : 2009.04.30

Abstract

In this study, we investigated photocatalytic ability of plasma sprayed $TiO_2$ and Ag sputtering $TiO_2$(Ag-$TiO_2$) coatings. A sputtering processes were adopted to coat the surface of $TiO_2$ with Ag(99.99%). Ag was sputtered at 10mA, 450V for $1{\sim}11$ seconds. $TiO_2$ and Ag-$TiO_2$ coatings were heat-treated at 250, 300, 350, $400^{\circ}C$ for $0{\sim}240$seconds. Photoelectrical conductivity was measured by four-point probe, and photodegradation was calculated by UV-V is spectrometer. Microstructure observation of $TiO_2$ and Ag-$TiO_2$ coatings were investigated by SEM. Crystal structure of $TiO_2$ and Ag-$TiO_2$ coatings were investigated by XRD. Qualitative analyses of $TiO_2$ and Ag-$TiO_2$ coatings were conducted by EDX. When $TiO_2$ coatings were heat-treated at $350^{\circ}C$ for 30 sec, photoelectrical conductivity and photodegradation were best. And in XRD analysis result, (101)/(110) relative intensity ratio of $TiO_2$(rutile) was comparably changed with photoelectrical conductivity. When Ag-$TiO_2$ coatings were heat-treated at $350^{\circ}C$ for 30 [sec] after sputtering Ag for 7 sec, Photoelectrical conductivity and photodegradation are best. Surface of coatings in such condition has very small and uniform Ag particles.

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References

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