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Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 μB/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.


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Shaped Co2+ doped TiO2 nanocrystals synthesized from nanotubular precursor: Structure and ferromagnetic behavior

Show Author's information M. VRANJEŠaJ. KULJANIN JAKOVLJEVIĆaZ. KONSTANTINOVIĆbA. POMARcM. STOILJKOVIĆaM. MITRIĆaT. RADETIĆdZ. ŠAPONJIĆa( )
Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia
Center for Solid State Physics and New Materials, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
Institut de Ciència de Materials de Barcelona, CSIC, Campus UAB, 08193 Bellaterra, Spain
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia

Abstract

Co2+ doped TiO2 nanocrystals were synthetized by a hydrothermal treatment procedure applied to precursor dispersion of titania nanotubes and Co2+ ions. Mixture of polygonal and prolate spheroid-like nanocrystals was obtained. The results of X-ray diffraction (XRD) analysis showed that resulted nanocrystals retain anatase crystal phase for both dopant concentrations (1.69 and 2.5 at%), but the crystal lattice parameters were affected. Reflection spectra revealed altered optical properties compared to bare TiO2. Room temperature ferromagnetic ordering with saturation magnetic moment in the range of 0.001-0.002 μB/Co was observed for both measured films made of Co2+ doped TiO2 nanocrystals.

Keywords: magnetic properties, hydrothermal synthesis, X-ray diffraction (XRD), transmission electron microscopy (TEM), doped TiO2

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Publication history

Received: 02 January 2017
Revised: 24 April 2017
Accepted: 31 May 2017
Published: 29 September 2017
Issue date: September 2017

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© The author(s) 2017

Acknowledgements

The financial support for this work was provided by the Ministry of Education, Science and Technological Development of Republic of Serbia (Project Nos. OI 172056 and III 45020). This work was done under umbrella of COST Action MP1106. Z. K. thanks for the support from the project III 45018 from the Ministry of Education, Science and Technological Development of Republic of Serbia. TEM characterization of titania nanotubes was provided by Prof. P. Ahrenkiel, South Dakota School of Mines & Technology, Rapid City, SD, USA.

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