Nanocrystalline films based on YCrO3 and LaCrO3 yttrium and lanthanum chromites doped with strontium ions Sr2+ as a basis for semiconductor gas sensors

Milena A. Yakimchuk; Eugenia S. Eliseeva; Victor F. Kostryukov

doi:10.17308/kcmf.2024.26/12229

Milena A. Yakimchuk Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation
Eugenia S. Eliseeva Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation
Victor F. Kostryukov Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0000-0001-5753-5653

DOI: https://doi.org/10.17308/kcmf.2024.26/12229

Keywords: Semiconductors, Gas sensitivity, Yttrium chromite, Lanthanum chromite, Doping, Nanofilms, Nanopowders

Abstract

For the production of gas-sensitive sensors, easily obtained nanostructured substances are required. Therefore, one of the most important scientific problems is the search for new compositions and an improvement in the used materials. The aim of this study was the creation of thin-film materials based on yttrium and lanthanum chromite nanopowdersYCrO₃ and LaCrO₃, doped with strontium ions, and the identification of their gas-sensitive properties.

The synthesis of nanopowders was carried out by the sol-gel method for LaCrO₃ and the citrate method for YCrO₃. Doped powders were obtained using the same synthesis methods as the original samples. The phase and elemental composition of the obtained samples was determined. The result of this study demonstrated that the actual composition of the nanopowders is close to the nominal one. Gas-sensitive properties were determined by measuring the specific surface resistance of the obtained samples to the content of carbon monoxide CO with a concentration of 50 ppm.

It was found that the obtained samples possess n-type of conductivity and a good response to the presence of traces of carbon monoxide. Yttrium chromite-based nanofilms exhibit better gas-sensitive response compared to LaCrO₃. The maximum value was obtained for Y0.9Sr0.1CrO₃, demonstrating a gas sensitive response of 2.83 at a temperature of 200 °C

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Author Biographies

Milena A. Yakimchuk, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Master’s student of the
Department of Materials Science and Industry of
Nanosystems, Voronezh State University (Voronezh,
Russian Federation)

Eugenia S. Eliseeva, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

student of the Department of
Materials Science and Industry of Nanosystems,
Voronezh State University (Voronezh, Russian
Federation)

Victor F. Kostryukov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Dr. Sci. (Chem.), Associate
Professor, Associate Professor of the Department of
Materials Science and Industry of Nanosystems,
Voronezh State University (Voronezh, Russian
Federation)

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