Optical and Structure Properties of Nanocrystalline Titania Powders with Cu Dopant

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• 作者：Nasrollah Najibi Ilkhechi ; Behzad Koozegar Kaleji
• 关键词：TiO2 nanocomposite ; Sol–gel ; Cu dopant ; Optical properties
• 刊名：Silicon
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：9
• 期：2
• 页码：285-291
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Inorganic Chemistry; Materials Science, general; Optics, Lasers, Photonics, Optical Devices; Environmental Chemistry;
• 出版者：Springer Netherlands
• ISSN：1876-9918
• 卷排序：9

文摘

TiO₂ nanopowders doped by Cu were prepared by the sol–gel method. The effects of Cu doping on the structural, optical, and photo-catalytic properties of titania nanopowders have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–Vis absorption spectroscopy. XRD results suggest that adding impurities has a significant effect on anatase phase stability, crystallinity, and particle size of TiO₂. Titania rutile phase formation in the system (Ti–Cu) was promoted by Cu2+ doped TiO₂. The photo-catalytic activity was evaluated by photo-catalytic degradation kinetics of aqueous methylene orange (MO) under visible radiation. The results show that the photo-catalytic activity of the 5 %Cu doped TiO₂ nanopowders has a larger degradation efficiency than pure TiO ₂ under visible light. Also, the minimum band gap was estimated to be ∼ 1.9–2 eV from UV–Vis spectra.