Room temperature ferromagnetism in Cu<sup>2+</sup> doped TiO<inf>2</inf> nanocrystals: The impact of their size, shape and dopant concentration

M. Vranješ, J. Kuljanin-Jakovljević, Z. Konstantinović, A. Pomar, S. P. Ahrenkiel, T. Radetić, M. Stoiljković, M. Mitrić, Z. Šaponjić

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    Abstract

    © 2015 Elsevier Ltd. Cu2+ doped TiO2 nanocrystals were synthesized using dispersions of titania nanotubes in the presence of Cu2+ ions as a precursors. The morphologies of nanotubular titania precursors and resulted Cu2+ doped TiO2 nanocrystals were characterized by TEM. Structural and optical properties were studied by XRPD analysis and UV-vis spectroscopy in reflectance mode, respectively. Their magnetic properties were investigated using SQUID magnetometer. Tetragonal anatase crystalline structure was confirmed in all synthesized samples. Polygonal (d ∼ 15 nm) and spheroid like (length, up to 90 nm) Cu2+ doped TiO2 nanocrystals in samples synthesized at different pHs were observed by TEM. Ferromagnetic ordering with almost closed loop (Hc ∼ 200 Oe) was detected in all Cu2+ doped TiO2 nanoparticle films. The saturation magnetization values varied depending on the Cu2+ concentration, nanoparticles shape, size and consequently different number of oxygen vacancies. This study revealed possibility to control magnetic ordering by changing the shape/aspect ratio of Cu2+ doped TiO2 nanocrystals.
    Original languageEnglish
    Pages (from-to)100-106
    JournalMaterials Research Bulletin
    Volume76
    DOIs
    Publication statusPublished - 1 Apr 2016

    Keywords

    • A. Nanostructures
    • A. Oxides
    • A. Semiconductors
    • B. Magnetic properties
    • B. Solvothermal
    • C. Transmission electron microscopy (TEM)
    • C. X-ray diffraction
    • D. Crystal structures
    • D. Defects

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