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
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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