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Journal of Nanomaterials
Volume 2017, Article ID 2316745, 7 pages
Research Article

Origin of Ferromagnetism in Ru and N Codoped TiO2 Nanotubes: Experiments and Theory Investigations

1College of Physics and Material Science, Henan Normal University, Xinxiang 453007, China
2Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, China
3Key Laboratory of Artificial Micro- and Nano-Structures, Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China

Correspondence should be addressed to Zhongpo Zhou; nc.ude.uhw@luap and Haiying Wang; nc.ude.uhw@yiahgnaw

Received 10 July 2016; Revised 24 October 2016; Accepted 15 December 2016; Published 12 January 2017

Academic Editor: Jae-Min Myoung

Copyright © 2017 Jing Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The room temperature ferromagnetism (RTFM) of the undoped, N doped, Ru doped ,and Ru-N codoped anatase TiO2 nanotubes (TNTs) films are investigated combined with experiments and first principles approaches. The experiments are highly consistent with the theory calculations. All samples display anatase structures and ferromagnetism at room temperature. The values of the saturation magnetization (Ms) of undoped TiO2, N doped TiO2, Ru doped TiO2, and Ru-N codoped TiO2, respectively, are 0.065 emu/g, 0.015 emu/g, 0.155 emu/g, and 0.073 emu/g. The calculated net moment is in the order of Ru doped > Ru-N codoped > undoped > N doped. The oxygen vacancies play an important role in RTFM of TNTs. Moreover, the hybridization of Ru 4d, N 2p, and O 2p led to the spin-spilt of Ru 4d, N 2p, and O 2p which is devoted to the system magnetism.