Thermal destruction of coprecipitated hydroxides of indium and dysprosium

Malinovskaya, T. D.; Ghyngazov, S. A.; Zhek, V. V.

doi:10.1007/s10973-019-08261-1

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…This method does not require expensive equipment; it is technologically advanced and can be easily scaled up. As shown in [13], the deposition method can be used for production of powders to manufacture targets for deposition of oxide films containing indium and dysprosium. A significant disadvantage of the method of chemical precipitation of metal hydroxides is a high degree of agglomeration of the synthesized powders and their wide grain-size distribution [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system

Malinovskaya,

Ghyngazov,

Aparnev

et al. 2023

Chim.Tech.Acta

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We investigated the feasibility of synthesizing nanopowders containing indium and dysprosium oxides by the glycine-nitrate method. It was found that the glycine-nitrate method significantly reduces the content of the indium component in the resulting mixture of indium and dysprosium oxides. In this case, intensive absorption of carbon dioxide from the air by the formed particles induces formation of amorphous carbonaceous compounds, which decompose only under high-temperature treatment (900 °C). This prevents compaction of powders synthesized by the glycine-nitrate method. Comparison of the characteristics of powders containing indium oxides and dysprosium, synthesized by the glycine-nitrate method and by the method of co-precipitation of indium and dysprosium hydroxides from chloride solutions, showed the advantage of the co-precipitation method in the pressing of powders.

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Section: Introductionmentioning

confidence: 99%

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system

Malinovskaya,

Ghyngazov,

Aparnev

et al. 2023

Chim.Tech.Acta

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Hydrogen Sensors Based on In2O3 Thin Films with Bimetallic Pt/Pd Catalysts on the Surface and Tin and Dysprosium Impurities in the Bulk

et al. 2022

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This paper presents the results of studying the characteristics of hydrogen sensors based on thin In2O3 films modified with tin and dysprosium with dispersed double Pt/Pd catalysts deposited on the surface. To control the content of Sn and Dy in the films, an original technology was developed, and ceramic targets were fabricated from powders of the In–Dy–O, Dy–Sn–O, and In–Dy–Sn–O systems synthesized by the sol–gel method. Films of complex composition were obtained by RF magnetron sputtering of the corresponding targets. Structural features of the obtained thin films were studied by Raman spectroscopy. It is shown that various combinations of tin and dysprosium concentrations, as well as the presence of Pt/Pd catalysts on the surface, have a significant effect on the defectiveness of the films and the density of oxygen adsorption centers. As a result, the resistance of sensors in pure air (R0), the activation energies of the temperature dependences of R0, the bending of the energy bands at the grain boundaries of the semiconductor, and the responses to the action of hydrogen in the concentration range of 20–25,000 ppm change. A unique feature of Pt/Pd/ In2O3: Sn (0.5 at%), Dy (4.95 at%) films is their high sensitivity at 20–100 ppm and the absence of signal saturation in the region of high hydrogen concentrations of 5000–25,000 ppm, allowing them to be used to detect H2 in a wide range of concentrations.

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Advanced SnO2 Thin Films: Stability and Sensitivity in CO Detection

Maksimova,

Malinovskaya,

Zhek

et al. 2024

IJMS

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This paper presents the results of a study on the characteristics of semiconductor sensors based on thin SnO2 films modified with antimony, dysprosium, and silver impurities and dispersed double Pt/Pd catalysts deposited on the surface to detect carbon monoxide (CO). An original technology was developed, and ceramic targets were made from powders of Sn-Sb-O, Sn–Sb-Dy–O, and Sn–Sb-Dy-Ag–O systems synthesized by the sol–gel method. Films of complex composition were obtained by RF magnetron sputtering of the corresponding targets, followed by technological annealing at various temperatures. The morphology of the films, the elemental and chemical composition, and the electrical and gas-sensitive properties were studied. Special attention was paid to the effect of the film composition on the stability of sensor parameters during long-term tests under the influence of CO. It was found that different combinations of concentrations of antimony, dysprosium, and silver had a significant effect on the size and distribution of nanocrystallites, the porosity, and the defects of films. The mechanisms of degradation under prolonged exposure to CO were examined. It was established that Pt/Pd/SnO2:0.5 at.% Sb film with optimal crystallite sizes and reduced porosity provided increased stability of carbon monoxide sensor parameters, and the response to the action of 100 ppm carbon monoxide was G1/G0 = 2–2.5.

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Thermal destruction of coprecipitated hydroxides of indium and dysprosium

Cited by 3 publications

References 25 publications

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system

Synthesis of nanopowders by the glycine-nitrate method in the In-Dy-O system

Hydrogen Sensors Based on In2O3 Thin Films with Bimetallic Pt/Pd Catalysts on the Surface and Tin and Dysprosium Impurities in the Bulk

Advanced SnO2 Thin Films: Stability and Sensitivity in CO Detection

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