Optical and structural properties of TiO2 nanopowders with Co/Ce doping at various temperature

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• 作者：Nasrollah Najibi Ilkhechi ; Mahnaz Alijani…
• 关键词：Optical materials ; Sol–gel growth ; X ; ray diffraction ; Ce/Co doped TiO2
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：48
• 期：2
• 全文大小：630 KB
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• 作者单位：Nasrollah Najibi Ilkhechi (1)
  Mahnaz Alijani (2)
  Behzad Koozegar Kaleji (2)
  
  1. Faculty of Material Engineering, Sahand University of Technology, Tabriz, Iran
  2. Department of Materials Engineering, Faculty of Engineering, Malayer University, P.O. Box: 65719-95863, Malayer, Iran
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

In this study, preparation of 2 mol% Ce and 4 mol% Co doped TiO₂ nanopowders via sol–gel process have been investigated. The effects of Co and Ce doping and calcination temperature (475–1000 °C) on the structural and optical properties of titania nanopowders studied by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscope and UV–Vis absorption spectroscope. XRD results showed that, Titania rutile phase formation in ternary system (Ti–Co–Ce) was inhibited by Ce4+ and promoted by Co4+ co-doped TiO₂ in high temperatures (500–700 °C) and 61 mol% anatase composition is retained even after calcination at 800 °C. The optical absorption spectrum indicates that the TiO₂ nanoparticles have a direct band gap of 3.21 eV. But optical band gap of the doped TiO₂ (2 mol% Ce and 4 mol% Co) was found to be 3.14–3.20 eV.