Optical, structural and radiospectroscopic studies of ZnO/MnO nanostructures synthesized by ultrasonic spray pyrolysis

Editorial Board PCSS Journal; О.V. Kovalenko; V.Yu. Vorovsky; N.I. Berezovska; I.M. Dmytruk; D.V. Korbutyak; V.O. Yukhymchuk

doi:10.15330/pcss.26.2.447-456

Authors

О.V. Kovalenko O. H. Dnipro National University, Dnipro, Ukraine
V.Yu. Vorovsky O. H. Dnipro National University, Dnipro, Ukraine
N.I. Berezovska Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Institute of Physics, NAS of Ukraine, Kyiv, Ukraine
I.M. Dmytruk Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Institute of Physics, NAS of Ukraine, Kyiv, Ukraine
D.V. Korbutyak V.E. Lashkaryov Institute of Semiconductors Physics, NAS of Ukraine, Kyiv, Ukraine
V.O. Yukhymchuk V.E. Lashkaryov Institute of Semiconductors Physics, NAS of Ukraine, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.26.2.447-456

Keywords:

Zinc oxide, Nanocrystals, Magnetic Impurities, Defects, Ultrasonic spray pyrolysis, X-ray diffraction, Electron paramagnetic resonance, Raman scattering, Photoluminescence

Abstract

The technology for the synthesis of nanocrystals (NCs) of pure ZnO and ZnO doped with a magnetic Mn impurity in concentrations of 2% and 4% by ultrasonic spray pyrolysis has been developed. The structural, morphological and optical properties of syntesied ZnO NCs have been studied with methods of X-ray diffraction, scanning electron microscopy, electron paramagnetic resonance (EPR), spectroscopy of Raman scattering and photoluminescence. The defective near-surface layer in ZnO:Mn NCs has been identified based on the analysis of the EPR spectra. Thermal annealing of samples at T = 850°C leads to the ordering of the crystal structure of ZnO:Mn NCs. The solubility limit of the Mn impurity is less than 2%. Raman spectra analysis has revealed that ZnO:Mn NCs are covered with ZnMn₂O₄ and d--MnO₂ shells. A significant increase in the intensity of exciton photoluminescence for ZnO NCs caused by the improvement of the structural perfection of NCs is to be a result of increasing the liquid flow rate to 40 l/h during the synthesis process. Thus, the optimal technological regimes to form high-quality, structurally perfect ZnO NCs can be elaborated by changing the liquid flow rate during the synthesis process.

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