The role of structural factors in the formation of gas sensing properties of TiO2 – Fe2O3 nanocomposites

  • Natallia E. Babaryka Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk
  • Dmitriy V. Sviridov Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

Abstract

TiO2 – Fe2O3 composites with iron oxide content in the range of 1–50 mol. % were synthesized by sol-gel method. By means of X-ray diffraction analysis, scanning electron microscopy and IR spectroscopy the dependence of composite structure on the oxide molar ratio and annealing temperature was established. With the use of the synthesized oxide materials semiconductor gas sensors were fabricated. The possibility of low temperature detection of ethanol vapor with sensor at power consumption of 20 mW was shown. Correlation between the gas sensing activity of the composites towards ethanol vapor and structural characteristics of the composites was revealed. The highest output signal value has been attained for TiO2 – Fe2O3 composite with 50 mol. % content of iron oxide heated below 400 °C. This material consists of two oxide phases (anatase and g-Fe2O3 ) and possesses a developed surface.

Author Biographies

Natallia E. Babaryka, Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

PhD (chemistry); associate professor at the department of inorganic chemistry, faculty of chemistry

Dmitriy V. Sviridov, Belarusian State University, Nezavisimosti avenue, 4, 220030, Minsk

corresponding member of the National Academy of Sciences of Belarus, doctor of science (chemistry); dean of the faculty of chemistry

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Published
2017-12-01
Keywords: oxide composite, chemical gas sensor, titanium dioxide, iron(III) oxide
Supporting Agencies The work was partially supported by Belarusian Republican Foundation for Fundamental Research (grant number Х15-078).
How to Cite
Babaryka, N. E., & Sviridov, D. V. (2017). The role of structural factors in the formation of gas sensing properties of TiO2 – Fe2O3 nanocomposites. Journal of the Belarusian State University. Chemistry, 2, 14-20. Retrieved from https://journals.bsu.by/index.php/chemistry/article/view/1162
Issue
No 2 (2017): Journal of the Belarusian State University. Chemistry
Section
Original Articles

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