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Oxygen vacancies contained TiO2 spheres: facile fabrication and enhanced ferromagnetism

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Abstract

Uniform TiO2 spheres with a size of around 400 nm have been successfully synthesized by a facile approach from Ti powders. The obtained TiO2 spheres exhibit a good anatase structure ever before the annealing treatment. Through the measurement of UV–Vis spectra and XPS spectra, it was proved that the as-obtianed TiO2 spheres contained a lot of oxygen vacancies (Vo). After annealed, the concentration of Vo are decreased seriously. Magnetic measurements showed that the ferromagnetism (FM) of the TiO2 spheres also decreased with the annealing treatment, which informs the larger the concentration of Vo is, the stronger the FM becomes. These results indicate that the FM in undoped TiO2 can be contributed to oxygen vacancies. Moreover, the facile and low cost synthesis method makes the products to be promising materials for spintronic devices.

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Acknowledgments

This work was supported by the Scientific Research Fund of Hunan Provincial Education Department under Grant No.09A083. The authors thank Dr. Yanpeng Qi for Rietveld refinement.

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Authors and Affiliations

  1. Department of Information Engineering, Institute of Laser and Information, Shaoyang University, Hunan, 422000, People’s Republic of China

    Hongmei Li, Yangsu Zeng, Tongcheng Huang & Min Liu

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  1. Hongmei Li
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  2. Yangsu Zeng
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  3. Tongcheng Huang
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  4. Min Liu
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Correspondence to Min Liu.

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This article is part of the topical collection on nanomaterials in energy, health and environment

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Li, H., Zeng, Y., Huang, T. et al. Oxygen vacancies contained TiO2 spheres: facile fabrication and enhanced ferromagnetism. J Nanopart Res 14, 1030 (2012). https://doi.org/10.1007/s11051-012-1030-2

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