Effects of reduced graphene oxide loading on gas-sensing characteristics of flame-made Bi2WO6 nanoparticles

Bunpang, K.; Wisitsoraat, Anurat; Tuantranont, Adisorn; Phanichphant, Sukon; Liewhiran, C.

doi:10.1016/j.apsusc.2019.143613

Cited by 39 publications

(15 citation statements)

References 46 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: 79%

“…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: 79%

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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“…1c), respectively. The result shows that Bi 3+ exists in Bi 2 WO 6 deposited PET fabric [25]. However, the peaks of W 4f and Bi 4f in the Bi 2 WO 6 /GO deposited PET fabric shift toward high binding energy, which suggests interaction between Bi 2 WO 6 and GO [26,27].…”

Section: Xps and Raman Spectramentioning

confidence: 90%

Visible-light-driven photocatalytic degradation of rhodamine B using Bi2WO6/GO deposited on polyethylene terephthalate fabric

Cui

Zhang

et al. 2020

J Leather Sci Eng

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The environmental repercussions of wastewater from the dye process mean that it is very important to obtain an eco-friendly photocatalyst that would degrade wastewater. Herein, bismuth tungstate/graphene oxide (Bi2WO6/GO) composites are fabricated through in-situ hydrothermal reaction and then the Bi2WO6/GO photocatalysts are deposited onto polyethylene terephthalate (PET) fabric. The obtained Bi2WO6/GO deposited PET fabrics are then characterized through XPS, Raman, SEM, TEM, XRD, UV-vis, BET method and photoluminescence spectroscopy (PL) to investigate their chemical and crystal structures, morphology, optical property, surface area and photochemical properties. Photocatalytic performance is studied through examining the rate of degrading rhodamine B (RhB) under visible light. Surface of PET fibers is densely covered with Bi2WO6/GO. Bi2WO6/GO deposited PET fabrics show a broad absorption band in the visible spectra. Removal rate of RhB on the Bi2WO6/GO deposited PET fabric is the highest with the GO content of 2 g/L (labeled as Bi2WO6/2 g/LGO). The result of active species experiment shows that superoxide radicals (·O2−) plays a major role in the degradation of RhB. Moreover, Bi2WO6/2 g/LGO deposited PET fabric shows excellent cycle stability of photocatalytic degradation for RhB. The findings in this work can be extended to preparation other types of composite on the textile for photocatalysis, which can be applied to remove dyes in the wastewater produced by the textile or leather industry. Graphical abstract

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“…Ketkaeo et.al. [295] investigated Bi2WO6 nanoparticles loaded with rGO nanosheets for H2S gas sensing applications. The developed sensor exhibited high H2S selectivity against numerous volatile organic compounds and some other environmental gases.…”

Section: Gas Sensingmentioning

confidence: 99%

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

et al. 2021

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Photocatalysis is a classical solution to energy conversion and environmental pollution control problems. In photocatalysis, the development and exploration of new visible light catalysts and their synthesis and modification strategies are crucial. It is also essential to understand the mechanism of these reactions in the various reaction media. Recently, bismuth and graphene’s unique geometrical and electronic properties have attracted considerable attention in photocatalysis. This review summarizes bismuth-graphene nanohybrids’ synthetic processes with various design considerations, fundamental mechanisms of action, heterogeneous photocatalysis, benefits, and challenges. Some key applications in energy conversion and environmental pollution control are discussed, such as CO2 reduction, water splitting, pollutant degradation, disinfection, and organic transformations. The detailed perspective of bismuth-graphene nanohybrids’ applications in various research fields presented herein should be of equal interest to academic and industrial scientists.

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Effects of reduced graphene oxide loading on gas-sensing characteristics of flame-made Bi2WO6 nanoparticles

Cited by 39 publications

References 46 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

Visible-light-driven photocatalytic degradation of rhodamine B using Bi2WO6/GO deposited on polyethylene terephthalate fabric

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

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