Observation and manipulation of paramagnetic oxygen vacancies in Co-doped TiO2 nanocrystals

被引：43
作者：
Pan, Dengyu [1 ]
Xu, Guoliang
Lv, Liya
Yong, Yuan
Wang, Xiuwei
Wan, Jianguo
Wang, Guanghou
机构：
[1] Nanjing Univ, Natl Lab Solid Microstruct, Dept Phys, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Ctr Mat Anal, Nanjing 210093, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 08期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1063/1.2335954
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Electron paramagnetic resonance measurements were presented to investigate paramagnetic oxygen vacancies (F+ centers) in Co-doped TiO2 nanocrystals. Surface and interior F+ centers were manipulated by washing or/and annealing. Anisotropic surface F+ centers are so instable as to be destroyed at high temperature, while isotropic interior F+ centers are rather stable even at 430 degrees C. The correlation of ferromagnetism with F+ centers was observed, which provided direct experimental evidence for F+-center-mediated coupling in diluted magnetic oxides. (c) 2006 American Institute of Physics.
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