Study of WO3–In2O3 nanocomposites for highly sensitive CO and NO2 gas sensors

Haiduk, Yu. S.; Khort, Alexander; Лапчук, Н. М.; Savitsky, A. A.

doi:10.1016/j.jssc.2019.02.023

Cited by 59 publications

(34 citation statements)

References 35 publications

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“…IR spectra of WO 3 , In 2 O 3 and Со 3 О 4 powders heat-treated at 200-600 °C were obtained and analyzed earlier [2,3,5]. For higher annealing temperatures the band of W-О valence oscillations (500-900 cm -1 ) is more intense and better resolved due to WO 3 dehydration.…”

Section: Resultsmentioning

confidence: 99%

“…Using oxide compositions is a promising method of increasing the sensitivity and selectivity of semiconductor gas sensors on the basis of SnO 2 , In 2 O 3 , WO 3 and other oxides [1]. Earlier [2][3][4][5] the structure and morphology of WO 3 -In 2 O 3 and WO 3 -Co 3 O 4 oxide compositions synthesized using the sol-gel method were studied. Xerogel annealing at 400 and 600 °C for 2 h in the WO 3 -In 2 O 3 system led to the formation of a heterogeneous two-phase material consisting of a monoclinic WO 3 phase and a cubic In 2 O 3 phase.…”

Section: Introductionmentioning

confidence: 99%

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Structure and gas sensitivity of WO3–In2O3 and WO3–Co3O4 oxide compositions

Haiduk¹,

Khort²,

Makhavikou³

et al. 2019

MoEM

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Using oxide compositions is a promising method of increasing the sensitivity and selectivity of semiconductor gas sensors on the basis of SnO2, In2O3, WO3 and other oxides. We have studied nanocrystalline tungsten oxide (WO3), indium oxide (In2O3), cobalt oxide (Co3O4) and mixed oxide compositions with different WO3/In2O3 and WO3/Co3O4 ratios synthesized using the sol-gel method after xerogel annealing at 400–600 °C. The morphology, phase composition and structure of the materials have been studied using X-ray diffraction, infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. We showed that stable structures can be produced in WO3–In2O3 and WO3–Со3O4 nanoheterogeneous compositions. The growth of grain size in WO3 and In2O3, WO3 and Co3O4 during heat treatment of mixed compositions occurs slower than in simple oxides. An increase in the gas sensitivity of the compositions in comparison with simple oxides can be accounted for by smaller grain sizes and hence larger specific surface area, as well as by the dependence of grain surface state on material composition. Both compositions exhibit the greatest nitrogen dioxide response at 130–150 °C and the greatest carbon oxide response at above 230 °C. We have produced low-power nitrogen dioxide sensors with a sensitivity of << 1 ppm and power consumption of ≤ 85 mW.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and gas sensitivity of WO3–In2O3 and WO3–Co3O4 oxide compositions

Haiduk¹,

Khort²,

Makhavikou³

et al. 2019

MoEM

View full text Add to dashboard Cite

show abstract

“…The word "sensor" finds its origin from the Latin word "sentire" which basically means 'to identify' [15]. A sensor is a device that is capable of identifying a physical quantity and then converting it into a signal type that can be read by an observer or by an instrument.…”

Section: Introductionmentioning

confidence: 99%

Nano metal oxides for sensing the VOC based gaseous pollutants

2020

Biointerface Res Appl Chem

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The detection and monitoring of harmful toxic volatile organic compound (VOC) gases liberated from various domestic activities is necessary for environmental concern. In this regard, VOC sensors have taken greater demand in domestic environmental monitoring because of their low operating cost, cheap, reliable, low power consumption, improved energy efficiency and reduced emission. In this regard, metal oxide materials in their nano form show growing strength in many research laboratories and public health and so on with their effective chemical, physical, and electronic properties. Therefore, an attempt has been made to study the nano metal oxides for different toxic gases basing on overall research trend like, a good correlation between sensing materials and sensing properties to improve the sensitivity and selectivity of VOC sensors. This paper tries to accumulate the findings of different metal oxide semiconductor nanomaterials used in various types of VOC sensors.

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“…To monitor the toxic gas, a gas sensor is imperative due to concerns for industry safety requirements. With this in mind, metal oxide (SnO 2 , WO 3 , In 2 O 3 , ZnO, Fe 2 O 3 , and TiO 2 )-based gas sensors were intensively investigated for detecting hazardous gases (CO and H 2 S) and identifying their mechanism [3,4,5,6,7,8,9]. For example, the core mechanism of detecting H 2 S gas with a CuO/ZnO hybrid is destroying the p–n junction with the formation of metallic CuS in the presence of H 2 S gas [10].…”

Section: Introductionmentioning

confidence: 99%

Cu/CuO@ZnO Hollow Nanofiber Gas Sensor: Effect of Hollow Nanofiber Structure and P–N Junction on Operating Temperature and Sensitivity

Hwang

Kim

Hong

et al. 2019

Sensors

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For the fast and easy detection of carbon monoxide (CO) gas, it was necessary to develop a CO gas sensor to operate in low temperatures. Herein, a novel Cu/CuO-decorated ZnO hollow nanofiber was prepared with the electrospinning, calcination, and photodeposition methods. In the presence of 100 ppm CO gas, the Cu/CuO-photodeposited ZnO hollow nanofiber (Cu/CuO@ZnO HNF) showed twice higher sensitivity than that of pure ZnO nanofiber at a relatively low working temperature of 300 °C. The hollow structure and p–n junction between Cu/CuO and ZnO would be considered to contribute to the enhancement of sensitivity to CO gas at 300 °C due to the improved specific surface area and efficient electron transfer.

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Study of WO3–In2O3 nanocomposites for highly sensitive CO and NO2 gas sensors

Cited by 59 publications

References 35 publications

Structure and gas sensitivity of WO3–In2O3 and WO3–Co3O4 oxide compositions

Structure and gas sensitivity of WO3–In2O3 and WO3–Co3O4 oxide compositions

Nano metal oxides for sensing the VOC based gaseous pollutants

Cu/CuO@ZnO Hollow Nanofiber Gas Sensor: Effect of Hollow Nanofiber Structure and P–N Junction on Operating Temperature and Sensitivity

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