Structures of nanowires with Zn-ZnO:CuO junctions for detecting ethanol vapors

Peshkova, Tatyana V.; Dimitrov, Dimitar; Nalimova, S. S.; Kononova, I. E.; Nikolaev, N. K.; Papazova, K. I.; Bozhinova, A. S.; Мошников, В. А.; Теруков, Е. И.

doi:10.1134/s1063784214050259

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…Meanwhile, the morphology of sensitive layers can be very diverse. The sensitive layers can consist of nanoparticles [17][18][19], nanorods [20,21], nanofibers [22], nanotubes [23], nanoplates [24], various hierarchical structures [25]. As a separate matter, it should be noted the intensive and promising research aimed at using 2Dmaterials as adsorption gas sensors [26].…”

Section: Introductionmentioning

confidence: 99%

Gas sensitivity of nanostructured coatings based on zinc oxide nanorods under combined activation

et al. 2022

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This paper presents a study of the gas sensitivity of a nanostructured zinc oxide coating to isopropyl alcohol vapor during heating, ultraviolet irradiation, as well as simultaneous heating and irradiation. Simultaneous heating to 150oC and ultraviolet irradiation ensures an increase in the sensor layer response. A 10-fold decrease in the power consumption of an ultraviolet light-emitting diode results in a 1.2-fold decrease in the response of the sensor coating. Reducing the operating temperature of a gas sensor with low power consumption and achieving the required sensitivity can provide adsorption sensors integration into portable devices for monitoring ambient air quality. Keywords: zinc oxide, nanorods, gas sensor, UV irradiation, combined activation.

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Section: Introductionmentioning

confidence: 99%

Gas sensitivity of nanostructured coatings based on zinc oxide nanorods under combined activation

et al. 2022

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“…The direct energy bands in these materials ensure efficient room-temperature ultraviolet luminescence, attractive for a number of practical applications. ZnS and ZnO can be used in gas sensors, photocatalytic coatings, solar cells, and piezoelectric energy nanogenerators [1][2][3][4][5]; as luminescent materials; and in lightemitting diodes and lasers [6,7]. ZnS single crystals doped with silver ions are used as scintillators for ionizing radiation detection [8].…”

Section: Introductionmentioning

confidence: 99%

Structural and Phase Transformations in the Thiourea/Zinc Acetate System

et al. 2022

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Using differential thermal analysis and thermogravimetry, we have studied thermal decomposition of a mechanical mixture of thiourea and zinc acetate, resulting in the formation of a composite material consisting of graphitic carbon nitride and zinc acetate, g-C 3 N 4 /ZnS, and possibly containing zinc oxide (ZnO) inclusions. In the case of a mixture containing the stoichiometric sulfur : zinc ratio for zinc sulfide synthesis, one can obtain a material containing only ZnS semiconductor crystals embedded in a g-C 3 N 4 matrix. ZnS is formed in the temperature range 317-367°C as a result of decomposition of zinc complexes with thiourea. Heating the mixture to above 560°C increases the rate of the thermal decomposition of g-C 3 N 4 , which reaches completion between 720 and 740°C. The presence of oxygen in the reaction atmosphere also accelerates this process, without significantly changing the temperature range of synthesis or decomposition of reaction products. The proposed technique can be used for the synthesis of g-C 3 N 4 -based composite materials and other semiconducting metal sulfides.

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“…The obtained structures were tested as a sensor to the vapour of ethanol. Interaction of the obtained sensor structures with vapour of ethanol is investigated by measuring the potential difference between the layers of pure and CuO modified ZnO nanowires in the temperature range from 190 to 300 °C [7].…”

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confidence: 99%

“…The dependence of the potential difference on the ethanol concentration for the samples with the different number of dip-coating cycles, at the temperature where the sensitivity of the samples has the maximum value, is shown on Fig. 3 [7].…”

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From Gas Sensors to Detection of Etanol Vapour to Sensor of Bacteria Detection

Dimitrov¹

2019

Izv. vysš. učebn. zaved. Ross., Radioèlektron.

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Introduction. Metal oxide semiconductor sensors have many advantages. But their working temperature is still high and their sensitivities are frequently low. In the current work, I present the results from investigation of sensing ability of new kind of potentiometric solid state gas sensor.Aim. The main goal of this work is investigation of the temperature dependence in the flow of air and in ethanol vapour mixture of the investigated junction structures. Also, we investigated at fixed temperature the dependence of the thermoelectric force from the ethanol vapour concentration at possible low operation temperature. For the structure, which shows the lowest operation temperature to ethanol vapour, we investigate the ability to detect Pseudomonas putida suspension.Materials and methods. In this work, the sensitivity to ethanol vapour and Pseudomonas putida suspension were investigated by measuring the thermoelectric force (the voltage) appearing of the structures by standart voltmeters.Results. Two experimental installations for sensors have been developed. The first one is for detection of ethanol vapour by ZnO/ZnO:Cu, ZnO/ZnO:CuO, ZnO/ZnO:Fe junction structures. The second installation was for Pseudomonas putida suspension detection in gas phase by ZnO/ZnO:Fe junction structure. We discovered that ZnO/ZnO:Fe structure, has the lowest operation temperature of 200 °C to ethanol vapour. For this structure, the potential difference has a negative value and decreases with increasing the amount of the pulverized bacteria.Conclusion. We discovered that ZnO/ZnO:Fe structure, has the lowest operation temperature of 200 °C. This operation temperature is a bit higher than operation temperature of at which some very novel sensing structures shows the maximum sensitivity.

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Structures of nanowires with Zn-ZnO:CuO junctions for detecting ethanol vapors

Cited by 11 publications

References 21 publications

Gas sensitivity of nanostructured coatings based on zinc oxide nanorods under combined activation

Gas sensitivity of nanostructured coatings based on zinc oxide nanorods under combined activation

Structural and Phase Transformations in the Thiourea/Zinc Acetate System

From Gas Sensors to Detection of Etanol Vapour to Sensor of Bacteria Detection

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