Structure, room-temperature magnetic and optical properties of Mn-doped TiO2 nano powders prepared by the sol–gel process

doi:10.1088/1674-1056/19/11/118102

中国物理B ›› 2010, Vol. 19 ›› Issue (11): 118102-118102.doi: 10.1088/1674-1056/19/11/118102

• CROSS DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process

丁芃, 刘发民, 周传仓, 钟文武, 张嬛, 蔡鲁刚, 曾乐贵

Department of Physics, School of Physics and Nuclear Energy Engineering, Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Beijing University of Aeronautics and Astronautics, Beijing 100191, China

收稿日期:2010-04-19 修回日期:2010-05-21 出版日期:2010-11-15 发布日期:2010-11-15
基金资助:
Project supported by the Innovation Foundation of BUAA for PhD Graduates (Grant No. 292122) and Equipment Research Foundation of China.

Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process

Ding Peng(丁芃),Liu Fa-Min(刘发民)^†,Zhou Chuang-Cang(周传仓), Zhong Wen-Wu(钟文武), Zhang Huan(张嬛), Cai Lu-Gang(蔡鲁刚), and Zeng Le-Gui(曾乐贵)

Department of Physics, School of Physics and Nuclear Energy Engineering, Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Received:2010-04-19 Revised:2010-05-21 Online:2010-11-15 Published:2010-11-15
Supported by:
Project supported by the Innovation Foundation of BUAA for PhD Graduates (Grant No. 292122) and Equipment Research Foundation of China.

摘要/Abstract

摘要： TiO₂ nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol-gel process, and were annealed at 500 ℃ and 800 ℃ in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn-TiO₂ nano powders with Mn concentration of 1 at% and 2 at% annealed at 500 and 800 ℃ are of pure anatase and rutile, respectively. The scanning electron microscope (SEM) observations reveal that the crystal grain size increases with the annealing temperature, and the high resolution transmission electron microscopy (HRTEM) investigations further indicate that the samples are well crystallized, confirming that Mn has doped into the TiO₂ crystal lattice effectively. The room temperature ferromagnetism, which could be explained within the scope of the bound magnetic polaron (BMP) theory, is detected in the Mn-TiO₂ samples with Mn concentration of 2 at%, and the magnetization of the powders annealed at 500 ℃ is stronger than that of the sample treated at 800 ℃. The UV-VIS diffuse reflectance spectra results demonstrate that the absorption of the TiO₂ powders could be enlarged by the enhanced trapped electron absorption caused by Mn doping.

Abstract: TiO₂ nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol–gel process, and were annealed at 500 ℃ and 800 ℃ in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn–TiO₂ nano powders with Mn concentration of 1 at% and 2 at% annealed at 500 and 800 ℃ are of pure anatase and rutile, respectively. The scanning electron microscope (SEM) observations reveal that the crystal grain size increases with the annealing temperature, and the high resolution transmission electron microscopy (HRTEM) investigations further indicate that the samples are well crystallized, confirming that Mn has doped into the TiO₂ crystal lattice effectively. The room temperature ferromagnetism, which could be explained within the scope of the bound magnetic polaron (BMP) theory, is detected in the Mn–TiO₂ samples with Mn concentration of 2 at%, and the magnetization of the powders annealed at 500 ℃ is stronger than that of the sample treated at 800 ℃. The UV–VIS diffuse reflectance spectra results demonstrate that the absorption of the TiO₂ powders could be enlarged by the enhanced trapped electron absorption caused by Mn doping.

Key words: Mn-doped TiO₂ nano powders, sol-gel process, room-temperature magnetic properties, diffuse reflectance spectra

中图分类号: (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

61.46.Df

75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 78.40.Ha (Other nonmetallic inorganics) 78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 81.16.-c (Methods of micro- and nanofabrication and processing) 81.40.Gh (Other heat and thermomechanical treatments)

丁芃, 刘发民, 周传仓, 钟文武, 张嬛, 蔡鲁刚, 曾乐贵. Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process[J]. 中国物理B, 2010, 19(11): 118102-118102.

Ding Peng(丁芃),Liu Fa-Min(刘发民),Zhou Chuang-Cang(周传仓), Zhong Wen-Wu(钟文武), Zhang Huan(张嬛), Cai Lu-Gang(蔡鲁刚), and Zeng Le-Gui(曾乐贵). Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process[J]. Chin. Phys. B, 2010, 19(11): 118102-118102.

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Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process

Structure, room-temperature magnetic and optical properties of Mn-doped TiO₂ nano powders prepared by the sol–gel process

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