Ag decorated WO3 sensor for the detection of sub-ppm level NO2 concentration in air

Kamble, Chetan; Panse, M. S.; Nimbalkar, Amol R.

doi:10.1016/j.mssp.2019.104613

Cited by 55 publications

(21 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimal calcination temperature was found at 500 • C to obtain the larger response, better selectivity, faster response/recovery time and better long-term stability for NO 2 [327]. With 0.5%Ag-WO 3 [328], the sensor shows higher NO 2 sensing response at 200 • C and higher selectivity for NO 2 in the presence of different interfering gases (NH 3 , acetone, SO 2 , methanol, CO 2 , NO). Significant decreases in gas responses were observed with high silver loading (5 and 10 mol%) because the silver crystallite size became too large and hindered their catalytic effects [329].…”

Section: Wo 3 -Based Sensor For No 2 Detectionmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

View full text Add to dashboard Cite

This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).

show abstract

Section: Wo 3 -Based Sensor For No 2 Detectionmentioning

confidence: 99%

Tungsten-Based Catalysts for Environmental Applications

2021

View full text Add to dashboard Cite

show abstract

“…Some noble metal particles also increase recovery time [ 55 , 56 , 57 ]. When the surface of the material is decorated with a noble metal, some chemical reactions often occur at the micro level, while the change of resistance structure is observed at the macro level [ 58 , 59 , 60 ]. According to these changes, we often classify sensors based on this method as chemical resistance sensors [ 60 , 61 ].…”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…Moreover, decoration with Ag nanoparticles had the same effect. Kamble et al [ 59 ] improved the performance of WO 3 film in sensors by modification with silver nanoparticles. The response speed was increased by 6 times.…”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…When the Fermi level arrives at a new balance, the depletion region and the Schottky barrier will be created in the interfaces ( Figure 3 ) [ 56 ]. They influence the concentration of carriers or improve the mobility of carriers [ 58 , 59 ]. In these circumstances, the baseline resistance changes, and the sensor response is improved.…”

Section: The Methods To Improve the Propertiesmentioning

confidence: 99%

“…We demonstrate some types of noble metal nanoparticles and some target gases in Table 1. In the next sections, we use the example of NO 2 gas to describe the effect of noble metal nanoparticles [56,59,60]. Decorating (loading) with Au and Ag nanoparticles could improve response and selectivity.…”

Section: Noble Metal Decoratingmentioning

confidence: 99%

See 2 more Smart Citations

Improving Gas-Sensing Performance Based on MOS Nanomaterials: A Review

et al. 2021

View full text Add to dashboard Cite

In order to solve issues of air pollution, to monitor human health, and to promote agricultural production, gas sensors have been used widely. Metal oxide semiconductor (MOS) gas sensors have become an important area of research in the field of gas sensing due to their high sensitivity, quick response time, and short recovery time for NO2, CO2, acetone, etc. In our article, we mainly focus on the gas-sensing properties of MOS gas sensors and summarize the methods that are based on the interface effect of MOS materials and micro–nanostructures to improve their performance. These methods include noble metal modification, doping, and core-shell (C-S) nanostructure. Moreover, we also describe the mechanism of these methods to analyze the advantages and disadvantages of energy barrier modulation and electron transfer for gas adsorption. Finally, we put forward a variety of research ideas based on the above methods to improve the gas-sensing properties. Some perspectives for the development of MOS gas sensors are also discussed.

show abstract