Room-temperature volatile organic compounds sensing based on WO3·0.33H2O, hexagonal-WO3, and their reduced graphene oxide composites

Perfecto, Tarcísio M.; Zito, Cecilia A.; Volanti, Diogo P.

doi:10.1039/c6ra16892b

Cited by 40 publications

(28 citation statements)

References 55 publications

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“…This crystalline structure is identical to hydrated tungsten oxide WO 3 -H 2 O of orthorhombic structure. This type of structure was also observed in the case of hydrothermal and solvothermal synthesis of tungsten oxide nanoparticles for sensing volatile organic compound (Perfecto et al, 2016) and photocatalytic activity (Liu et al, 2019), respectively. The calcination of WO 3 -H 2 O at 200 and 600°C respectively showed different XRD patterns.…”

Section: Catalytic Testssupporting

confidence: 55%

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation

Eroi¹,

Ello²,

Diabaté³

et al. 2020

Afr. J. Pure Appl. Chem.

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In this work, a tungsten oxide nanoparticle was developed with a simple method, using tungsten powder. The orthorhombic, hexagonal and monoclinic crystalline structures obtained were characterized by X-ray diffraction, scanning electron microscopy, as well as Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The coupling of these tungsten oxide nano particles with hydrogen peroxide is carried out on methyl orange removal from wastewater. The use of Hydrated orthorhombic particles showed the highest removal rate up to 89.7% comparatively to hexagonal and monoclinic crystalline structures respectively. The reusability of these particles showed a good stability with monoclinic crystalline structure after four cycles.

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Section: Catalytic Testssupporting

confidence: 55%

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation

Eroi¹,

Ello²,

Diabaté³

et al. 2020

Afr. J. Pure Appl. Chem.

View full text Add to dashboard Cite

show abstract

“…The second article was about the engineering of tungsten trioxide/reduced graphene oxide-based materials, which was again very promising for the acetone detection at 22 °C and RH of 55%. Specifically, as already unraveled in a previously cited paper, Perfecto et al [ 95 ] successfully synthesized RGO-h-WO 3 ⋅0.33H 2 O (hexagonal WO 3 polymorph) by the one-pot microwave-assisted hydrothermal method. The authors found that all the materials behave as p-type semiconductors after being exposed to reducing gases, evidencing a 20% greater response for the composite material with respect to pure WO 3 ( Figure 8 k).…”

Section: Reduced Graphene Oxide-based Chemoresistorsmentioning

confidence: 98%

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

Pargoletti

Cappelletti

2020

Nanomaterials

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Nowadays, the detection of volatile organic compounds (VOCs) at trace levels (down to ppb) is feasible by exploiting ultra-sensitive and highly selective chemoresistors, especially in the field of medical diagnosis. By coupling metal oxide semiconductors (MOS e.g., SnO2, ZnO, WO3, CuO, TiO2 and Fe2O3) with innovative carbon-based materials (graphene, graphene oxide, reduced graphene oxide, single-wall and multi-wall carbon nanotubes), outstanding performances in terms of sensitivity, selectivity, limits of detection, response and recovery times towards specific gaseous targets (such as ethanol, acetone, formaldehyde and aromatic compounds) can be easily achieved. Notably, carbonaceous species, highly interconnected to MOS nanoparticles, enhance the sensor responses by (i) increasing the surface area and the pore content, (ii) favoring the electron migration, the transfer efficiency (spillover effect) and gas diffusion rate, (iii) promoting the active sites concomitantly limiting the nanopowders agglomeration; and (iv) forming nano-heterojunctions. Herein, the aim of the present review is to highlight the above-mentioned hybrid features in order to engineer novel flexible, miniaturized and low working temperature sensors, able to detect specific VOC biomarkers of a human’s disease.

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“…Moreover, it can detect the acetone even at sub-ppm concentration (~0.2 ppm) and the sensor can operates at 90% humid condition, thus become an exceptional candidate in acetone quantitation. Apart from the aforementioned diverse nanostructures, nanocomposites that are not described under any unique nano-architectures also show their high selective sensitivity to acetone [148][149][150][151][152][153] as shown in Table 1. Wherein, a few of them operate at diverse humid conditions (10-90% RH) and some others require optimization of operating temperature to attain high sensitivity.…”

Section: Diverse Nanostructures In Acetone Detectionmentioning

confidence: 99%

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

Shellaiah

Sun

2021

Sensors

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Environmental pollution related to volatile organic compounds (VOCs) has become a global issue which attracts intensive work towards their controlling and monitoring. To this direction various regulations and research towards VOCs detection have been laid down and conducted by many countries. Distinct devices are proposed to monitor the VOCs pollution. Among them, chemiresistor devices comprised of inorganic-semiconducting materials with diverse nanostructures are most attractive because they are cost-effective and eco-friendly. These diverse nanostructured materials-based devices are usually made up of nanoparticles, nanowires/rods, nanocrystals, nanotubes, nanocages, nanocubes, nanocomposites, etc. They can be employed in monitoring the VOCs present in the reliable sources. This review outlines the device-based VOC detection using diverse semiconducting-nanostructured materials and covers more than 340 references that have been published since 2016.

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Room-temperature volatile organic compounds sensing based on WO₃·0.33H₂O, hexagonal-WO_3, and their reduced graphene oxide composites

Abstract: The sensors based on WO3·0.33H2O, RGO-WO3·0.33H2O, h-WO3, and RGO-h-WO3 showed great VOCs sensing properties at room temperature and 55% relative humidity. The materials exhibited a p-type behavior. RGO improved the acetone sensing response.

Cited by 40 publications

References 55 publications

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation

Catalytic activity of using tungsten oxide with hydrogen peroxide for methyl orange degradation

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

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