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Article

The Phase Evolution and Photocatalytic Properties of a Ti-TiO2 Bilayer Thin Film Prepared Using Thermal Oxidation

1
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan
2
Department of Tropical Agriculture and International Cooperation, National Pingtung University of Science & Technology, Pingtung 91201, Taiwan
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Department of Agricultural Product Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Malang 65145, Indonesia
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Department of Plant Industry, National Pingtung University of Science & Technology, Pingtung 91201, Taiwan
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Kaohsiung Veterans General Hospital, Kaohsiung City 813414, Taiwan
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Department of Applied Physic, National Pingtung University, Pingtung 90003, Taiwan
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Department of Materials Engineering, National Pingtung University of Science & Technology, Pingtung 91201, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editors: Aomar Hadjadj and Paolo Mele
Coatings 2021, 11(7), 808; https://doi.org/10.3390/coatings11070808
Received: 6 May 2021 / Revised: 29 June 2021 / Accepted: 30 June 2021 / Published: 3 July 2021
Ti-TiO2 bilayer thin films were successfully prepared onto a glass substrate using magnetron sputtering with different TiO2 bottom layer conditions. These represent a lack of (as-deposited) and full oxygen content (annealed). Single-layer Ti was additionally used as a control. The influence of oxygen diffusion phenomena of the bottom layer of TiO2 to the upper layer of Ti thin films at different oxidation temperatures on structural, optical, and photocatalytic performance was investigated. X-ray diffraction (XRD) results confirmed that the crystalline phases coexisting on thin-film samples oxidized at 450 °C were TiO, TiO1.4, (bilayer, as-deposited TiO2), anatase (bilayer, annealed TiO2), and rutile (single and bilayer). This finding showed that the film’s phase structure evolution is significantly affected by oxygen diffusion from the bottom layer. Further increasing the thermal oxidation temperature caused a notable decline in the amorphous zone in bilayer thin films based on TEM analysis. Bilayer thin films lead to higher degradation of methylene blue under UV light radiation (63%) than single-layer films (45%) oxidized at 450 °C. High photocatalytic activity performance was found in the bilayer annealed TiO2-Ti thin-film sample. This study demonstrates that the bilayer modification strategy promotes the oxygen-induced bottom layer of TiO2 bilayer thin films. View Full-Text
Keywords: TiO2; bilayer thin films; photocatalytic; thermal oxidation TiO2; bilayer thin films; photocatalytic; thermal oxidation
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MDPI and ACS Style

Lee, P.-Y.; Widyastuti, E.; Lin, T.-C.; Chiu, C.-T.; Xu, F.-Y.; Tseng, Y.-T.; Lee, Y.-C. The Phase Evolution and Photocatalytic Properties of a Ti-TiO2 Bilayer Thin Film Prepared Using Thermal Oxidation. Coatings 2021, 11, 808. https://doi.org/10.3390/coatings11070808

AMA Style

Lee P-Y, Widyastuti E, Lin T-C, Chiu C-T, Xu F-Y, Tseng Y-T, Lee Y-C. The Phase Evolution and Photocatalytic Properties of a Ti-TiO2 Bilayer Thin Film Prepared Using Thermal Oxidation. Coatings. 2021; 11(7):808. https://doi.org/10.3390/coatings11070808

Chicago/Turabian Style

Lee, Ping-Yuan, Endrika Widyastuti, Tzu-Che Lin, Chen-Tien Chiu, Fu-Yang Xu, Yaw-Teng Tseng, and Ying-Chieh Lee. 2021. "The Phase Evolution and Photocatalytic Properties of a Ti-TiO2 Bilayer Thin Film Prepared Using Thermal Oxidation" Coatings 11, no. 7: 808. https://doi.org/10.3390/coatings11070808

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