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Optical Properties of Zinc Sulfide Nanopowders and ZnS/Ag2S Heteronanostructures

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Abstract

Nanopowders of zinc sulfide (ZnS) and ZnS/Ag2S heteronanostructures were synthesized by chemical deposition from aqueous solutions. A change in the ratio between the concentrations of reagents allowed us to obtain ZnS nanopowders with a particle mean size from 2 to 10 nm. The Ag2S nanoparticle size in the resulting heteronanostructures was 9–30 nm and the ZnS surface layer thickness was equal to 4–5 nm. The diffuse reflectance spectra for nanostructured ZnS and ZnS/Ag2S heteronanostructures were measured. Based on the analysis of the obtained spectra, the bandgap energy Eg in the studied sulfide nanostructures was estimated. Upon a decrease in the nanoparticle size from 10 to 2 nm, the Eg value in ZnS nanopowders increased in a range of 3.17–3.36 eV. An increase in the content of Ag2S in the ZnS/Ag2S heteronanostructures led to a decrease in the bandgap energy and a decrease in the luminescence intensity.

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ACKNOWLEDGMENTS

The authors are grateful to A.V. Ishchenko for the help in measurement of two diffuse reflectance spectra for heteronanostructures with a low content of silver sulfide performed at the Educational Research Center “Nanomaterials and Nanotechnologies” of the Ural Federal University.

Funding

This work was performed under financial support from the Russian Science Foundation (project no. 19-79-10101) at the Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    S. I. Sadovnikov & I. D. Popov

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  1. S. I. Sadovnikov
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  2. I. D. Popov
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Correspondence to S. I. Sadovnikov.

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Translated by K. Utegenov

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Sadovnikov, S.I., Popov, I.D. Optical Properties of Zinc Sulfide Nanopowders and ZnS/Ag2S Heteronanostructures. Phys. Solid State 62, 2004–2011 (2020). https://doi.org/10.1134/S1063783420110268

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