Ferromagnetism in Nitrogen-Doped TiO2 Nanoparticles

被引：6
|
作者：
Wen, Qi-Ye [1 ]
Zhang, Huai-Wu [1 ]
Yang, Qing-Hui [1 ]
Jing, Yu-Lan [1 ]
Zhang, Pei-Xin [2 ]
机构：
[1] Univ Elect Sci & Technol China, State Key Lab Elect Films & Integrated Devices, Chengdu 610054, Peoples R China
[2] Shenzhen Univ, Sch Chem & Chem Engn, Shenzhen 518060, Peoples R China
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2011年 / 47卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Magnetic Semiconductors; nonmagnetic ions doping; nanoparticles; PHOTOCATALYSTS; TEMPERATURE;
D O I：
10.1109/TMAG.2011.2153832
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Nitrogen-doped anatase TiO2 nanoparticles were synthesized by a two-step wet chemical method. The N element is proved to be incorporated into the lattice of TiO2 with an average concentration of 3.3 at%. Magnetic measurements show that the undoped TiO2 is ferromagnetic at room-temperature (RT), which can be ascribed to a universal ferromagnetism (FM) in nanoparticles of metal oxides. However, significant enhancement of the FM was observed in N-doped TiO2 nanoparticles and it is robust against high-temperature annealing. Our results confirm the first-principle prediction that spin-polarized holes induced by N doping can mediate the spin alignment of the N dopants, leading to the strong RT FM in anatase TiO2.
引用
收藏
页码：3987 / 3990
页数：4
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