Chemical modification of impregnated SnO2-In2O3 nanocomposites due to interaction of sensor components

Герасимов, Г. Н.; Иким, М. И.; Громов, В. Ф.; Ilegbusi, Olusegun J.; Трахтенберг, Л. И.

doi:10.1016/j.jallcom.2021.160817

Cited by 23 publications

(15 citation statements)

References 34 publications

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“…The properties of binary metal oxide sensors largely depend on the method of their preparation. This is indicated, especially by the data on the conductivity and sensor properties of SnO 2 –In 2 O 3 composites obtained from a mixture of nanopowders by screen printing [ 30 , 31 , 32 , 33 ], when In 2 O 3 is impregnated with tin oxide [ 34 , 35 , 36 ], and by the hydrothermal method [ 37 , 38 ]. Composites formed by these methods contain nanoparticles of various sizes.…”

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

“…The addition of small amounts of SnO 2 up to 7–8 wt.% leads to a drop in the resistance and sensory response of the impregnated composite [ 34 , 35 ]. With a subsequent increase in the amount of SnO 2 , both the resistance of the composite and the detection efficiency increase.…”

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

“…A further increase in the SnO 2 content to 60–65 wt.% produces a sharp drop in sensor activity due to a decrease in the number of oxygen vacancies resulting from the removal of indium ions from the lattice of SnO 2 clusters. This is evidenced by a decrease in interplanar spacing d(110) in SnO 2 clusters with increase in the SnO 2 concentration in the composite to 65 wt.% [ 35 ]. In this case, the structure of these clusters in the composite approaches the structure of the initial SnO 2 clusters.…”

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

“…The interaction of hydrogen with chemisorbed oxygen leads to an increase in the difference (ΔW) between the work functions for SnO 2 and In 2 O 3 , which is accompanied by sensitization of the electron transfer process. An increase in the value of ΔW promotes the flow of current along the conduction paths through the SnO 2 nanoclusters due to the contribution of the conduction electrons of the In 2 O 3 nanocrystals in contact with the SnO 2 nanoclusters, which enhances the sensor response [ 35 ].…”

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

“…In the previous sections, some studies were presented that considered the role of oxygen vacancies in increasing the chemisorption of oxygen and analyzed gases (see, for example, [ 12 , 35 , 60 ]). In [ 65 ], a new method was proposed for obtaining SnO 2 with a controlled content of surface oxygen.…”

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

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Synthesis, Structural and Sensor Properties of Nanosized Mixed Oxides Based on In2O3 Particles

Ikim

Герасимов

Громов

et al. 2023

IJMS

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The paper considers the relationship between the structure and properties of nanostructured conductometric sensors based on binary mixtures of semiconductor oxides designed to detect reducing gases in the environment. The sensor effect in such systems is determined by the chemisorption of molecules on the surface of catalytically active particles and the transfer of chemisorbed products to electron-rich nanoparticles, where these products react with the analyzed gas. In this regard, the role is evaluated of the method of synthesizing the composites, the catalytic activity of metal oxides (CeO2, SnO2, ZnO), and the type of conductivity of metal oxides (Co3O4, ZrO2) in the sensor process. The effect of oxygen vacancies present in the composites on the performance characteristics is also considered. Particular attention is paid to the influence of the synthesis procedure for preparing sensitive layers based on CeO2–In2O3 on the structure of the resulting composites, as well as their conductive and sensor properties.

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Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

Section: Factors Affecting the Efficiency Of Sensitive Layersmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis, Structural and Sensor Properties of Nanosized Mixed Oxides Based on In2O3 Particles

Ikim

Герасимов

Громов

et al. 2023

IJMS

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Synthesis and optical characterizations of pure In2O3 and mixed Mn2O3–In2O3 nanomaterials on fluorine-doped tin oxide substrates

et al. 2022

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Effect of SILAR cycle on gas sensing properties of In2O3 thin films for CO gas sensor

Horoz,

Tuna Yıldırım,

Soltabayev

et al. 2024

J Mater Sci: Mater Electron

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In2O3 thin films were deposited via Successive Ionic Layer Adsorption and Reaction (SILAR) method on glass substrates at 20, 30, 40, and 50 SILAR cycles. The effect of SILAR cycle on the general and CO gas sensing properties of the films was investigated. The GIXRD and FE-SEM results indicated that the films had cubic phase and porous morphology. As a function of temperature and gas concentration, CO gas sensing measurements of In2O3 thin film-based sensors were made, and the detection limit and operating temperature values were determined. The optimal operating temperature was found to be 222 °C for all sensors. The CO sensing results demonstrated that the sensor with 30 SILAR cycle had higher sensitivity for 1–100-ppm gas concentration values at 222 °C operating temperature than the others. The sensing responses of the sensors increased from 12 to 29% for 1-ppm CO gas and from 52 to 91% for 100-ppm CO gas at 222 °C, depending on the SILAR cycle. The detection limit of the sensors toward CO gas at 222 °C reached 1 ppm, and the response and recovery times of the sensor with 30 SILAR cycle were found to be 54.2 s and 49 s for 1-ppm CO, and 47.4 and 62.5 s for 100-ppm CO gas at 222 °C, respectively. The activation energy (Ea) values of the sensors were found to change between 0.08 and 0.15 eV in the temperature range of 300–340 K and between 0.700 and 0.749 eV in the temperature range of 350–520 K, with SILAR cycle number. Finally, in this study, it was revealed that SILAR cycle number changed the structural, morphological, and CO gas sensing properties of the In2O3 thin films, and SILAR cycle optimization was performed for the highly sensitive In2O3 thin film-based CO gas sensor.

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Chemical modification of impregnated SnO2-In2O3 nanocomposites due to interaction of sensor components

Cited by 23 publications

References 34 publications

Synthesis, Structural and Sensor Properties of Nanosized Mixed Oxides Based on In2O3 Particles

Synthesis, Structural and Sensor Properties of Nanosized Mixed Oxides Based on In2O3 Particles

Synthesis and optical characterizations of pure In2O3 and mixed Mn2O3–In2O3 nanomaterials on fluorine-doped tin oxide substrates

Effect of SILAR cycle on gas sensing properties of In2O3 thin films for CO gas sensor

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