EPR study of paramagnetic centers in mesoporous titanium dioxide prepared by nitric acid oxidation of titanium carbide

Authors

  • Evgeni A. Ovodok Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk
  • Maria I. Ivanovskaya Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk
  • Sergey K. Poznyak Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk
  • Tatiana V. Gaevskaya Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk
  • Igor I. Azarko Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

Keywords:

mesoporous TiO2, EPR, C- and N-containing paramagnetic centers

Abstract

Paramagnetic defects and radical forms of impurities in titanium dioxide, prepared from TiC by nitric acid oxidation and subsequent calcination in different conditions, have been studied by EPR. The presence of NO2, NO22−, NО, O3– and·С ≡ paramagnetic species in the TiO2 powder annealed in air was found. Heat treatment of the as-prepared TiO2 in argon leads to the formation of Ti3+ ions and large amount of С-containing radicals, which are characteristic of amorphous carbon. Processes responsible for appearance of paramagnetic centers and radicals in the TiO2 samples during synthesis were considered.

Author Biographies

  • Evgeni A. Ovodok, Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk

    researcher at the laboratory of thin films chemistry

  • Maria I. Ivanovskaya, Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk

    PhD (chemistry), docent; leading researcher at the laboratory of thin films chemistry

  • Sergey K. Poznyak, Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk

    PhD (chemistry); leading researcher at the laboratory of thin films chemistry

  • Tatiana V. Gaevskaya, Research Institute for Physical Chemical problems of the Belarusian State University, Leningradskaya street, 14, 220006, Minsk

    PhD (chemistry), docent; leading researcher at the laboratory of thin films chemistry

  • Igor I. Azarko, Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

    PhD (physics and mathematics); head of the research laboratory of semiconductor physics and technology at
    the department of semiconductor physics and nanoelectronics, faculty of physics

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Published

2017-12-01

Issue

No. 2 (2017): Journal of the Belarusian State University. Chemistry

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Original Articles

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How to Cite

[1]
Ovodok, E.A. et al. 2017. EPR study of paramagnetic centers in mesoporous titanium dioxide prepared by nitric acid oxidation of titanium carbide. Journal of the Belarusian State University. Chemistry. 2 (Dec. 2017), 50–58.