A review on WO3 based gas sensors: Morphology control and enhanced sensing properties

Dong, Chengjun; Zhao, Rongjun; Yao, Lifang; Yan, Ran; Zhang, Xu; Wang, Yude

doi:10.1016/j.jallcom.2019.153194

Cited by 243 publications

(124 citation statements)

References 258 publications

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“…Another commonly used SMO is tungsten oxide (WO 3 ) with a band gap of 2.7 eV. Owing to good sensitivity, selectivity, rich oxygen vacancy defects, surface polarization, and modulated surface activities in detecting a variety of gases, chemiresistive gas sensors based on WO 3 nanostructures have been widely studied [48,49]. Zinc oxide (ZnO) is another popularly used SMO in chemiresistive gas sensors.…”

Section: Types Of Semiconducting Metal Oxides N-type Semiconductorsmentioning

confidence: 99%

An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring

John

Murugappan

Nisbet

et al. 2021

Sensors

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An electronic nose (Enose) relies on the use of an array of partially selective chemical gas sensors for identification of various chemical compounds, including volatile organic compounds in gas mixtures. They have been proposed as a portable low-cost technology to analyse complex odours in the food industry and for environmental monitoring. Recent advances in nanofabrication, sensor and microcircuitry design, neural networks, and system integration have considerably improved the efficacy of Enose devices. Here, we highlight different types of semiconducting metal oxides as well as their sensing mechanism and integration into Enose systems, including different pattern recognition techniques employed for data analysis. We offer a critical perspective of state-of-the-art commercial and custom-made Enoses, identifying current challenges for the broader uptake and use of Enose systems in a variety of applications.

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Section: Types Of Semiconducting Metal Oxides N-type Semiconductorsmentioning

confidence: 99%

An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring

John

Murugappan

Nisbet

et al. 2021

Sensors

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“…As presented in the several references, WO 3 based nanomaterials are widely investigated in the field of electrochromic devices [56], gas sensing [57], and photocatalysis [58] in different morphologies and structures. Even though the solgel process has a long past and is an intensely researched method [59] the literature of sol-gel preparation of WO 3 using microwave-assistance is scarce.…”

Section: Optical Transmission Of the Tio2 And V-doped Tio2 Films Obtamentioning

confidence: 99%

Influence of the Microwaves on the Sol-Gel Syntheses and on the Properties of the Resulting Oxide Nanostructures

Predoană¹,

Karajz²,

Odhiambo³

et al. 2021

Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects

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Among the chemical methods in the liquid phase, the sol–gel technique is a versatile and efficient method for pure or doped metal oxide films or powders preparation, showing some advantages over other preparation techniques (high homogeneity, the possibility to introducing dopants in large amount, low processing temperature and control over the stoichiometry). Combining the sol–gel (SG)method with the effect of ultrasounds(US) or microwaves (MW) leads to improving the sol–gel procedure. The microwave-assisted sol–gel method is most frequently used for obtaining nanocrystalline, monodispersed oxide nanoparticles, or to transform amorphous gels into well-crystallized nanopowders. Less studied is the influence of the microwaves on the sol–gel reactions in solutions. The benefit of using microwave-assisted sol–gel preparation highly depends on the reagents used and on the composition of the studied systems. In the present chapter, results on the influence of the microwaves on the chemical reactions that take place during the sol–gel synthesis and on the properties of the resulted samples are discussed.

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“…Many are the materials used in air pollutant sensors, and among them semiconducting metal oxides are very popular [111]. In particular, WO 3 , due to its peculiarities, is often used as sensor material [112][113][114][115].…”

Section: Wo 3 and Ionic Liquids In Pollutant Gas Sensingmentioning

confidence: 99%

WO3 and Ionic Liquids: A Synergic Pair for Pollutant Gas Sensing and Desulfurization

D’Anna

Grilli

Petrucci

et al. 2020

Metals

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This review deals with the notable results obtained by the synergy between ionic liquids (ILs) and WO3 in the field of pollutant gas sensing and sulfur removal pretreatment of fuels. Starting from the known characteristics of tungsten trioxide as catalytic material, many authors have proposed the use of ionic liquids in order to both direct WO3 production towards controllable nanostructures (nanorods, nanospheres, etc.) and to modify the metal oxide structure (incorporating ILs) in order to increase the gas adsorption ability and, thus, the catalytic efficiency. Moreover, ionic liquids are able to highly disperse WO3 in composites, thus enhancing the contact surface and the catalytic ability of WO3 in both hydrodesulfurization (HDS) and oxidative desulfurization (ODS) of liquid fuels. In particular, the use of ILs in composite synthesis can direct the hydrogenation process (HDS) towards sulfur compounds rather than towards olefins, thus preserving the octane number of the fuel while highly reducing the sulfur content and, thus, the possibility of air pollution with sulfur oxides. A similar performance enhancement was obtained in ODS, where the high dispersion of WO3 (due to the use of ILs during the synthesis) allows for noteworthy results at very low temperatures (50 °C).

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A review on WO3 based gas sensors: Morphology control and enhanced sensing properties

Cited by 243 publications

References 258 publications

An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring

An Outlook of Recent Advances in Chemiresistive Sensor-Based Electronic Nose Systems for Food Quality and Environmental Monitoring

Influence of the Microwaves on the Sol-Gel Syntheses and on the Properties of the Resulting Oxide Nanostructures

WO3 and Ionic Liquids: A Synergic Pair for Pollutant Gas Sensing and Desulfurization

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