Influence of deposition atmosphere on photocatalytic activity of TiO2/SiOx double-layers prepared by RF magnetron sputtering |
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Authors: | Seung Gie Seong Eui Jung Kim Ka Eun Lee |
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Affiliation: | a Department of Physics, University of Ulsan, Ulsan 680-749, South Korea b Department of Chemical Engineering, University of Ulsan, Ulsan 680-749, South Korea |
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Abstract: | TiO2/SiOx double-layers have been prepared at room temperature by RF magnetron sputtering. The TiO2 top-layer was deposited in an Ar atmosphere, while the SiOx bottom-layer was deposited in an Ar/O2 atmosphere. Samples were characterized using X-ray photoelectron spectroscopy, scanning electron microscopy, atomic force microscopy, and photoluminescence techniques. The photocatalytic activity of the samples was evaluated by the photodegradation of methylene blue; the results showed that the photocatalytic activity of the TiO2/SiOx double-layers was superior to that of the TiO2 single-layers. The presence of the SiOx bottom-layer improved the photocatalytic activity of the TiO2 layer because it may act as a trap for electrons generated in the TiO2 layer thus preventing electron-hole recombinations. |
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Keywords: | RF magnetron sputtering TiO2 SiOx Thin films Photocatalytic activity |
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