Preparation and Characterization of Room Temperature Ferromagnetic Co-Doped Anatase TiO2 Nanobelts

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School of Materials Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China, and State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Science, Beijing 100080, China
* To whom correspondence should be addressed. E-mail: [email protected]. Tel: 86-10-82339503 . Fax: 86-10-82339503.
†Beijing University of Aeronautics and Astronautics.
‡Chinese Academy of Science.
Cite this: J. Phys. Chem. C 2008, 112, 23, 8604–8608
Publication Date (Web):May 10, 2008
https://doi.org/10.1021/jp8003294
Copyright © 2008 American Chemical Society
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Abstract

We herein report a preparation process of Co-doped anatase TiO2 nanobelts facilely combining ion-exchange with hydrothermal treatment. A series of TiO2 materials with different Co2+ contents were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared (FT-IR), and magnetic measurement techniques. The results show that Co2+ cations have doped into the TiO2 lattice structure and that any metallic cobalt clusters or nanoparticles could not be found. The magnetic result demonstrates that the prepared Co-doped TiO2 samples are room-temperature ferromagnetic materials, whereas with the increase of Co2+ content, the remnant magnetization tends to decrease due to the superexchange coupling interaction between Co2+ ions owing to the ununiform distribution.

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