The purpose of this work was to study optical properties of nanosized powders of ZnO doped with Fe₂O₃, MnO and CoO. Nanocrystaline samples were synthesized by wet chemical method. Samples were characterized by X-ray diffraction to determine composition of the samples. The mean crystalline size varied from 8-52 nm for ZnO doped with Fe₂O₃, between 9-100 nm for ZnO doped with MnO and between 14-156 nm for ZnO doped with CoO.

    In this paper we report the experimental spectra of micro-Raman measurements, at different laser powers. With increases of laser power, the peaks shift to lower frequencies and broaden. In all samples Raman peak at 436 cm^-1 is clearly visible. This peak is typical for undoped ZnO nanoparticles [1].

    For the samples of ZnO doped with Fe₂O₃ the Raman spectrum shows the band at ~ 642 cm^-1. The presence of this band is typical for Fe doped ZnO nanoparticles [1]. In these samples, especially in case of high doping level, bands from various crystal structures are identified (Fe₂O₃, ZnFe₂O₄) from about 514 to 660 cm^-1.

    For the samples of ZnO doped with MnO Raman peak at ~ 660 cm^-1 is clearly visible.     This peak is typical for spinel structure. In these samples especially in case of high doping level, bands from various crystal structures are identified (ZnMnO₃, Mn₃O₄) at about 315 and 525 cm^-1.

    For the samples of ZnO doped with CoO the Raman spectrum shows the band at ~ 691 cm^-1. The presence of this band is typical for Co₃O₄. We also observed bands at ~ 194, 482, 521 and 618 cm^-1. These bands are typical for Co₃O₄, too.

[1] R. Y. Sato-Berru, A. Vazquez-Olmos, A.L. Fernandez-Osorio and S. Sortes-Martinez, J. Raman Spectrosc. 38 (2007) 1073.

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