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

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.

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

Received: 19 April 2010
Revised: 21 May 2010
Accepted manuscript online:

PACS:	61.46.Df	(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))
	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)

Fund: Project supported by the Innovation Foundation of BUAA for PhD Graduates (Grant No. 292122) and Equipment Research Foundation of China.

Cite this article:

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 2010 Chin. Phys. B 19 118102

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

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