Optical and structural properties of TiO₂ nanopowders with Ce/Sn doping at various calcination temperature and time

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• 作者：Mahnaz Alijani ; Behzad Koozegar Kaleji
• 关键词：Doping ; TiO2 nanoparticles ; Sol–gel ; Optical properties ; Structural properties ; Photo ; catalytic activity
• 刊名：Optical and Quantum Electronics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：49
• 期：1
• 全文大小：1607KB
• 刊物主题：Optics, Lasers, Photonics, Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X
• 卷排序：49

文摘

In this paper, the influence of calcination temperature and time has been investigated on the structural, morphological, optical, and photo-catalytic properties of Sn/Ce co-doped TiO₂ nano-powders prepared via sol–gel process. They were calcined at the temperatures in the range of 475–975 °C for 1 and 2 h. The photocatalytic ability of TiO₂ powders was evaluated by means of methylene blue degradation experiments conducted under the irradiation of simulated solar light. The X-ray diffraction results showed that the tensile strain in the host lattice was present. The comparison with undoped and Sn or Ce-doped TiO₂, co-doped TiO₂ shows an obviously higher catalytic activity under visible light irradiation. The absorbance spectrum of Ce and Sn co-doped TiO₂ exhibited significant red-shift to visible region. The red-shift is caused by the appearance of a new electronic state in the middle of the TiO₂ band-gap. FESEM images show the formation of doped TiO₂ nanoparticles with small size in structure and spherical in shape. The FTIR spectra exhibited peaks corresponding to the anatase and rutile structure phases of TiO₂.