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Temperature effect on the structure and characteristics of ZnS-based quantum dots

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Abstract

The synthesis of zinc sulfide (ZnS) quantum dots (QDs) by microwave heating in a water-ethanol medium is proposed. The effect of the synthesis temperature (80 °C, 100 °C, 120 °C, and 150 °C) on the QD characteristics is examined. Based on the analysis of X-ray diffraction profiles the conclusion is drawn that the hexagonal ZnS phase of wurtzite type with an average nanocrystal size of 2.6-3.7 nm forms in the synthesized QDs. The nanocrystallite size is found to increase with the QD synthesis heating temperature. The analysis of X-ray absorption spectra (XANES) at the zinc K-edge indicates a higher crystallinity of the QD samples prepared at higher synthesis temperatures. The combined analysis of X-ray diffraction profiles, optical diffuse reflectance spectra, and X-ray absorption spectra implies the following possible QD structure: the pure hexagonal ZnS phase of wurtzite type in the bulk of nanoparticles and the amorphous ZnO phase in the surface layer of nanoparticles.

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Authors and Affiliations

  1. International Research Center “Smart Materials”, Southern Federal University, Rostov-on-Don, Russia

    A. N. Kravtsova, A. P. Budnik, I. A. Pankin, A. L. Bugaev & A. V. Soldatov

  2. Research Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, Russia

    A. A. Tsaturyan

  3. Department of Chemistry, University of Turin, Turin, Italy

    I. A. Pankin & A. L. Bugaev

Authors
  1. A. N. Kravtsova
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  2. A. P. Budnik
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  3. A. A. Tsaturyan
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  4. I. A. Pankin
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  5. A. L. Bugaev
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  6. A. V. Soldatov
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Correspondence to A. N. Kravtsova.

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Original Russian Text © 2017 A. N. Kravtsova, A. P. Budnik, A. A. Tsaturyan, I. A. Pankin, A. L. Bugaev, A. V. Soldatov.

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Kravtsova, A.N., Budnik, A.P., Tsaturyan, A.A. et al. Temperature effect on the structure and characteristics of ZnS-based quantum dots. J Struct Chem 58, 1397–1402 (2017). https://doi.org/10.1134/S0022476617070174

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  • DOI: https://doi.org/10.1134/S0022476617070174

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