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  • Coordination of intercalated ▫$Cu_{2+}$▫ sites in copper doped sodium titanate nanotubes and nanoribbons
    Umek, Polona ...
    Copper doped sodium titanate nanotubes and nanoribbons were prepared via two different doping methods called in situ and ex situ. In the applied in situ method, titanate nanotubes were grown from ... anatase TiO[sub]2 doped with Cu[sup]2+ while in the ex situ method, titanate nanotubes and nanoribbons were exposed toaqueous solution of Cu[sup]2+ species. By correlating XRD, electron microscopy, magnetic susceptibility, and electron paramagnetic resonance (EPR) 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 where the Neel transition temperature is strongly suppressed. In fact, they behave as superparamagnets with a blocking temperature of around 50 K. Strong evidence that Cu[sup]2+ species that form complexes between titanate layers coordinate with Na[sup]+ ions comes from the pulsed EPR data.
    Source: The journal of physical chemistry. C, Nanomaterials and interfaces. - ISSN 1932-7447 (Vol. 112, iss. 39, 2008, str. 15311-15319)
    Type of material - article, component part
    Publish date - 2008
    Language - english
    COBISS.SI-ID - 21989927
    DOI

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