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Determination of Radicals Energy Levels in the Bandgap of Nanocrystalline Oxides of Titanium, Molybdenum, and Vanadium Using EPR Spectroscopy

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Abstract

A new method for constructing energy band diagrams based on EPR spectroscopy data is proposed and applied to study nitrogen-doped nanocrystalline oxides of titanium, molybdenum, and vanadium (TiO2, MoO3, V2O5) with a specific surface area of about 100 m2/g and an average nanoparticle size of 10–15 nm. Nitrogen N• radicals and Ti3+ centers were detected in TiO2, N•, NO• centers and Mo5+ ions in MoO3, and V4+ centers in V2O5. The defect concentrations were 6.5 × 1017, 9.8 × 1016, and 2 × 1017 g–1, respectively. The position of the radical energy levels in the forbidden band is determined using the EPR method. The unique properties of TiO2 with a high concentration of radicals and a photocatalysis rate can be used to create energy-efficient photocatalytic devices operating in the visible range of the spectrum.

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Funding

This study was supported by the Russian Foundation for Basic Research, project no. 18-29-23051.

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Authors and Affiliations

  1. Moscow State University, Moscow, Russia

    E. V. Kytina, E. R. Parkhomenko, E. A. Nazarova & E. A. Konstantinova

  2. National Research Center “Kurchatov Institute”, Moscow, Russia

    E. A. Konstantinova

Authors
  1. E. V. Kytina
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  2. E. R. Parkhomenko
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  3. E. A. Nazarova
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  4. E. A. Konstantinova
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Corresponding author

Correspondence to E. A. Konstantinova.

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Translated by V. Alekseev

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Kytina, E.V., Parkhomenko, E.R., Nazarova, E.A. et al. Determination of Radicals Energy Levels in the Bandgap of Nanocrystalline Oxides of Titanium, Molybdenum, and Vanadium Using EPR Spectroscopy. Dokl. Phys. 66, 191–194 (2021). https://doi.org/10.1134/S102833582107003X

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  • DOI: https://doi.org/10.1134/S102833582107003X

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