Nanostructure Bi2WO6: Surfactant-assisted hydrothermal synthesis for high sensitive and selective sensing of H2S

Liu, Wen‐Cheng; Qu, Yang; Li, Hao; Ji, Fangjie; Dong, Huanli; Wu, Mingkun; Chen, Hao; Lin, Zhidong

doi:10.1016/j.snb.2019.05.042

Cited by 28 publications

(7 citation statements)

References 36 publications

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“…Aside from the high sensitivity of WO 3 to NO 2 , tungsten oxide displayed poor selectivity to reducing gases, as inferred from the comparable sensor signals in the range S Red = 1-10 for the WO 3 sensor (Figure 21b). On the contrary, Bi 2 WO 6 displayed the selectively high sensitivity to H 2 S, which was also in the spotlight of other works [39,40]. It should be due to specific H 2 S-Bi 3+ binding between the soft Pearson's acid (bismuth cation) and base (sulfur atom in H 2 S).…”

Section: Effect Of Cations On Sensitivity and Selectivity Of Mixed-mementioning

confidence: 85%

“…Unlike the mechanisms of catalysis which have been the subject for careful kinetic studies, the interaction of reducing gases with chemisorbed oxygen at the sensors surfaces has hardly been experimentally proven. The ionosorption model, i.e., oxidation by ionosorbed oxygen species, has often been speculatively used to describe the sensing mechanisms of reducing gases [32][33][34][35][38][39][40]. The major issue is the lack of techniques for the observation of chemisorbed oxygen species, especially under in situ reaction conditions [25].…”

Section: The Ionosorption Model Of Sensor Responsementioning

confidence: 99%

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The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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Development of sensor materials based on metal oxide semiconductors (MOS) for selective gas sensors is challenging for the tasks of air quality monitoring, early fire detection, gas leaks search, breath analysis, etc. An extensive range of sensor materials has been elaborated, but no consistent guidelines can be found for choosing a material composition targeting the selective detection of specific gases. Fundamental relations between material composition and sensing behavior have not been unambiguously established. In the present review, we summarize our recent works on the research of active sites and gas sensing behavior of n-type semiconductor metal oxides with different composition (simple oxides ZnO, In2O3, SnO2, WO3; mixed-metal oxides BaSnO3, Bi2WO6), and functionalized by catalytic noble metals (Ru, Pd, Au). The materials were variously characterized. The composition, metal-oxygen bonding, microstructure, active sites, sensing behavior, and interaction routes with gases (CO, NH3, SO2, VOC, NO2) were examined. The key role of active sites in determining the selectivity of sensor materials is substantiated. It was shown that the metal-oxygen bond energy of the MOS correlates with the surface acidity and the concentration of surface oxygen species and oxygen vacancies, which control the adsorption and redox conversion of analyte gas molecules. The effects of cations in mixed-metal oxides on the sensitivity and selectivity of BaSnO3 and Bi2WO6 to SO2 and VOCs, respectively, are rationalized. The determining role of catalytic noble metals in oxidation of reducing analyte gases and the impact of acid sites of MOS to gas adsorption are demonstrated.

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Section: Effect Of Cations On Sensitivity and Selectivity Of Mixed-mementioning

confidence: 85%

Section: The Ionosorption Model Of Sensor Responsementioning

confidence: 99%

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Marikutsa

Rumyantseva

Константинова

et al. 2021

Sensors

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“…Various methods have been performed to improve the gas sensing performance, to overcome the defects of pure metal oxides such as low sensitivity, low selectivity, and long response time for some gases ( Liu et al, 2019 ). Among them, noble metal doping is one of the most common and effective methods.…”

Section: Influencing Factors Of 2d H-wo 3 On Gas Sensing Performancementioning

confidence: 99%

Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

Zhou

Ding

et al. 2021

Front. Chem.

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Metal oxide semiconductor gas sensing materials have attracted great research interest in the gas sensor field due to their outstanding physical and chemical properties, low cost, and easy preparation. Among them, two-dimensional hexagonal tungsten trioxide (2D h-WO3) is especially interesting because of its high sensitivity and selectivity to some gases. We firstly introduce the characteristics of 2D h-WO3 gas sensing materials and discuss the effects of microstructure, oxygen vacancy, and doping modification on the gas sensing properties of 2D h-WO3 mainly. Finally, we explore the application of 2D h-WO3 gas sensing materials and propose some research directions.

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“…0.51 eV) [13]. Thus, plenty of attempts have been carried out to improve the photocatalytic activity of Bi 2 WO 6 such as controlling morphology [14], elemental doping [15] and building heterojunctions [16, 17]. Carbon materials have attracted widespread attention for designing photocatalysts due to their excellent ability to store/deliver electrons [11].…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Carbon quantum dots modified Bi ₂ WO ₆ nanoflowers for enhancing photocatalytic activity: an experimental and DFT study

Song

et al. 2020

Micro & Nano Letters

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Carbon quantum dots (CQDs) decorated Bi 2 WO6 nanocomposites were successfully synthesised by a facile hydrothermal method. The prepared samples were characterised by the XRD, FESEM, TEM, XPS, UV-vis DRS, photocurrent and photoluminescence (PL) techniques. The DRS, photocurrent, PL spectra measurements reveal that the introduction of CQDs could broaden the absorption edge and accelerate the separation and transportation efficiency of carriers. Moreover, a reasonable charge transfer approach was given out based on the calculated work function and the differential charge difference. The CQDs/Bi 2 WO 6-2 sample provides the optimal activity for photodegradation of CIP under simulated sunlight irradiation. It is hopeful that this work not only gives a reference for the design of CQDs/Bi 2 WO 6 composites, but also provides some mechanistic insights into enhanced photoactivity.

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Nanostructure Bi2WO6: Surfactant-assisted hydrothermal synthesis for high sensitive and selective sensing of H2S

Cited by 28 publications

References 36 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

Carbon quantum dots modified Bi ₂ WO ₆ nanoflowers for enhancing photocatalytic activity: an experimental and DFT study

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Nanostructure Bi2WO6: Surfactant-assisted hydrothermal synthesis for high sensitive and selective sensing of H2S

Cited by 28 publications

References 36 publications

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

The Key Role of Active Sites in the Development of Selective Metal Oxide Sensor Materials

Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

Carbon quantum dots modified Bi 2 WO 6 nanoflowers for enhancing photocatalytic activity: an experimental and DFT study

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Product

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Carbon quantum dots modified Bi ₂ WO ₆ nanoflowers for enhancing photocatalytic activity: an experimental and DFT study