Copper doped sodium titanate nanotubes and nanoribbons were prepared via in-situ and ex-situ methods. In the applied in situ method, titanate nanotubes were grown from anatase TiO2 doped with Cu2+, while in the ex situ method, titanate nanotubes were exposed to aqueous solution of Cu2+ species. By correlating XRD, electron microscopy, magnetic susceptibility, and electron paramagnetic resonance measurements, we found that in the samples prepared via the ex situ doping method, sub-10 nm CuO nanoparticles grow on the inner/outer surface of nanotubes/nanoribbons.
COBISS.SI-ID: 21989927
In this article, we highlight some of the advantages of sol-gel routes based on selected examples. The first part reviews some recent developments in the synthesis of ternary metal oxide nanoparticles by surfactant-free nonaqueous sol–gel routes. In the second part of the paper we present original results regarding the synthesis of dilute magnetic semiconductor TiO2 nanoparticles doped with cobalt and iron. The structural characterization as well as the magnetic properties with special attention to the doping efficiency is discussed.
COBISS.SI-ID: 22008359
We present an electron-energy-loss spectroscopy study of the O-K and Ti L2,3 edges for anatase-, rutile-, and titania-based nanotubes. The titania-based tubes are composed of tetravalent titanium ions in an octahedral symmetry with the oxygen ligands, however the electronic structure does not correspond to that of either of the titania precursors. Crystal-field splitting is comparable with anatase but the 3d occupation number is closer to that of rutile.
COBISS.SI-ID: 22770471
The structure and the magnetic properties of Co- and Mn-doped ZnO nanorods, synthesized by a straightforward and experimentally simple nonaqueous sol–gel route. They have been investigated by various characterization techniques, including X-ray diffraction high-resolution transmission electron microscopy, magnetization measurements and EPR. The Co-doped ZnO powders are ferromagnetic with a Curie temperature exceeding room temperature. Conversely, the Mn-doped samples show antiferromagnetic correlations with a possible transition to an antiferromagnetic ground state below TN = 10 K.
COBISS.SI-ID: 22054951
A new nanocrystalline inorganic-organic hybrid compound, VO(C6H5COO)2 has been synthesized under solvothermal conditions. A detailed investigation of the composition, structure and properties of VO(C6H5COO)2 using synchrotron X-ray powder diffraction, electron microscopy techniques and SQUID magnetometry and EPR is carefully described. The magnetic susceptibility and X-band EPR measurements shows that the magnetic properties of VO(C6H5COO)2 can be described by a S=1/2 linear antiferromagnetic chainmodel.
COBISS.SI-ID: 22770727