| Photoelectrical Conductivity and Photodegradation Properties of TiO₂ and Ag Sputtered TiO₂ Plasma Spraying Coatings |
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Tae-Gu Kang, Yong-Ho Jang, Kyeung-Chae Park |
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| Abstract |
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In this study, we investigated photocatalytic ability of plasma sprayed TiO₂ and Ag sputterig TiO₂(Ag-TiO₂) coatings. A sputtering processes were adopted to coat the surface of TiO₂ with Ag(99.99%). Ag was sputtered at 10mA, 450V for 1~11 seconds. TiO₂ AND Ag-TiO₂ coatings were heat-treated at 250, 300, 350, 400℃ for 0~24seconds. Photoelectrical conductivity was measured by four-point probe, and photodegradation2-5) was calculated by UV-V is spectrometer. Microstructure observation of TiO₂ and Ag-TiO₂ coatings were investigated by SEM. Crystal structure of TiO₂ and Ag-TiO₂ coatings were investigated by XRD. Qualitative analyses of TiO₂ and Ag-TiO₂ coatings were conducted by EDX. When TiO₂ coatings were heat-teated at 350℃ for 30 sec, photoelectrical conductivity and photodegradation were best. And in XRD analysis result, (101)/(110) relative intensity ratio of TiO₂(rutile) was comparably changed with photoelectrical conductivity. When Ag-TiO₂ coatings were heat-treated at 350℃ 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 |
| Key Words:
Photoelectrical conductivity, Photodegradation, TiO₂, Plasma spraying coating |
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