Structure and gas sensitive properties of oxide compositions WO3—In2O3 and WO3—Co3O4
https://doi.org/10.17073/1609-3577-2019-1-53-66
Abstract
Nanocrystalline tungsten oxide (WO3), indium oxide (In2O3), cobalt oxide (Co3O4) and mixed composites with different WO3—In2O3 and WO3—Co3O4 ratios were obtained by the sol-gel method after calcination of xerogels at 400—600 °C. The morphology, phase composition, and structural features of the materials obtained were studied by X-ray diffraction, infrared spectroscopy, and scanning electron microscopy. The increase in the gas sensitivity of the joint composition compared to the initial oxides can be explained by a decrease in the crystallite size and an increase in the specific surface, as well as by the dependence of the surface state of the grains on the composition. The highest sensory response to nitrogen dioxide in both compositions lies in the range of 130—150 °C, and to carbon monoxide, above 230 °C. Low-power planar nitrogen dioxide sensors with a sensitivity of << 1 ppm and power consumption ≤ 85 mW were produced.
About the Authors
Yu. S. Haiduk
Belarusian State University
Yulyan S. Haiduk: Researcher
4 Nezavisimosti Ave., Minsk 220030, Belarus
A. A. Khort
A. V. Luikov Heat and Mass Transfer Institute of NAS of Belarus
Alexander A. Khort: Cand. Sci. (Chem.), Senior Researcher
15 Brovki Str., Minsk 220072, Belarus
M. A. Makhavikou
Belarusian State University
Maxim A. Makhavikou: Junior Researcher
4 Nezavisimosti Ave., Minsk 220030, Belarus
A. A. Savitsky
Belarusian State University
Alexander A. Savitsky: Cand. Sci. (Chem.), Associate Professor, Department of Physical Chemistry
4 Nezavisimosti Ave., Minsk 220030, Belarus
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Review
For citations:
Haiduk Yu.S., Khort A.A., Makhavikou M.A., Savitsky A.A. Structure and gas sensitive properties of oxide compositions WO3—In2O3 and WO3—Co3O4. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2019;22(1):53-66. (In Russ.) https://doi.org/10.17073/1609-3577-2019-1-53-66
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