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Mechanochemically synthesized cobalt monoselenide: structural characterization and optical properties

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Abstract

Chalcogenide semiconductor cobalt monoselenide, CoSe, was prepared from metallic cobalt and selenium powders in stoichiometric ratio by simple and fast mechanochemical synthesis after 120 min of milling in a planetary ball mill Pulverisette 6 (Fritsch, Germany) in an argon atmosphere. Crystal structure and morphology of the product were characterized by X-ray diffraction, specific surface area measurements, and transmission electron microscopy. X-ray diffraction analysis confirmed the hexagonal crystal structure of the product-CoSe (freboldite) with the average size of the crystallites 26 nm. Transmission electron microscopy analysis has revealed that CoSe nanostructures are composed of agglomerated and randomly oriented nanoparticles. The optical properties were studied using UV–Vis and photoluminescence spectroscopy. Mechanochemically synthesized CoSe nanostructures showed higher absorption in whole UV–Vis optical region and the determined band-gap energy 1.70 eV is blue-shifted relative to the bulk CoSe. Both UV–Vis and photoluminescence spectra indicate quantum size effect of CoSe nanocrystals.

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Acknowledgements

This work was supported by the Slovak Research and Development Agency under the contract No. APVV-14-0103.

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Authors and Affiliations

  1. Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, University of Technology, 38678, Clausthal, Germany

    Marcela Achimovičová

  2. Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 04001, Košice, Slovakia

    Marcela Achimovičová, Erika Dutková & Anna Zorkovská

  3. Department for Nanostructured Materials, Jožef Stefan Institute, 1000, Ljubljana, Slovenia

    Nina Daneu

Authors
  1. Marcela Achimovičová
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  2. Nina Daneu
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  3. Erika Dutková
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  4. Anna Zorkovská
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Correspondence to Marcela Achimovičová.

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Achimovičová, M., Daneu, N., Dutková, E. et al. Mechanochemically synthesized cobalt monoselenide: structural characterization and optical properties. Appl. Phys. A 123, 154 (2017). https://doi.org/10.1007/s00339-017-0785-9

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