Bimetal Au-Pd decorated hierarchical WO3 nanowire bundles for gas sensing application

Zeb, Shah; Peng, Xiujing; Shi, Yushu; Su, Jingyong; Sun, Junhua; Zhang, Miaomiao; Sun, Guoxin; Nie, Yong; Cui, Yu; Jiang, Xuchuan

doi:10.1016/j.snb.2021.129584

Cited by 65 publications

(58 citation statements)

References 63 publications

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“…The induced charge transfer took place only in a localized manner and had no direct impact on the electrical conduction of WS 2 . Similar observations are also found in literature [30,43].…”

Section: Electrical and Sensing Performancesupporting

confidence: 92%

Au-Decorated WS2 Microflakes Based Sensors for Selective Ammonia Detection at Room Temperature

Guang

Huang

2021

Chemosensors

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Gold nanoparticles decorated WS2 microflakes (Au/WS2) have been synthesized by an in situ chemical reducing process. A chemiresistive-type sensor using as-synthesized Au/WS2 heterostructures as sensing materials shows an improved response to different concentrations of ammonia compared to pure WS2 at room temperature. As the concentrations of gold nanoparticles increased in heterostructures, response/recovery speeds of the sensors became faster although the sensitivity of the sensor was compromised compared to the sensitivity of the sensor with lower concentrations of Au. In addition, the Au/WS2-based sensor indicated excellent selectivity to formaldehyde, ethanol, benzene and acetone at room temperature. The improved performance of the sensors was attributed to the synergistic effect of electronic sensitization and chemical sensitization between WS2 and Au.

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Section: Electrical and Sensing Performancesupporting

confidence: 92%

Au-Decorated WS2 Microflakes Based Sensors for Selective Ammonia Detection at Room Temperature

Guang

Huang

2021

Chemosensors

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“…67,347,348 Au, Ag, and Pd nanoparticles may exhibit a strong, robust, stable, and tunable LSPR absorption band in both the visible and NIR absorption wavelengths. 69,349 Au and Pd nanoparticles of a spherical shape with size 4-6 nm were deposited on the surface active sites of WO 3 nanowire bundles in the HAuCl 4 , and PdCl 2 solutions with additional oxidation 67,149,350 (Figure 23). In such a scenario, the absorbed NIR light could subsequently be converted to heat energy due to the electron-phonon/phonon-phonon interactions.…”

Section: Materials Advances Accepted Manuscriptmentioning

confidence: 99%

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

et al. 2021

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“…Furthermore, gold (Au) is another extensively used metal to improve the sensing behavior of MOX-based gas sensors. [34,62,69] Recently, Zeb et al [70] used bimetal (Au-Pd) to modify the surface of WO 3 nanowires for the detection of n-butanol. Due to the presence of bimetal, the change in sensing behavior is mainly dominated by the highly induced electronic sensitization (see Figure 23).…”

Section: Metal Particle Decorationmentioning

confidence: 99%

Materials Engineering Strategies to Control Metal Oxides Nanowires Sensing Properties

Kaur

Singh

Comini

2021

Adv Materials Inter

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such as transistors, solar cells, batteries, superconductivity, and so on. In particular, nanostructured MOXs were found to be highly efficient as active layers of sensors due to their high surfaceto-volume ratio, high crystallinity, and excellent stoichiometry. Over the years, many MOXs such as zinc oxide (ZnO), nickel oxide (NiO), tin oxide (SnO 2 ), etc. were synthesized in different nanostructured forms (nanotubes, nanorods, nanobelts, etc.) and successfully explored as an active sensing layer for the detection of various gas analytes. However, in the last few years, MOXs in nanowires (NWs) morphology were gaining great attention due to their well-defined crystal orientation, single crystallinity, excellent electrical properties, and faster response dynamics as gas diffusion prior to surface reactions is not required. [1] Besides their success, MOXs nanowires still suffer from selectivity and high temperature operation issues. To further improve their performances and overcome these obstacles, nowadays researchers are working on the modification of nanowires via different strategies. These strategies include nanowires heterostructures, quasi-1D core-shell structures, particle decoration, surface functionalization with self-assembled monolayers (SAMs), modification with graphene and MOX@MOF coresheath structures. Nanowires based heterostructures may synergistically combine the properties of two different materials in a single sensing platform at nanoscale level. [2] While, coreshell structures offer high surface area, lower rate of charge recombination, and full depletion regions, which are desirable properties to increase the sensing performance. [3] Moreover, nanowires functionalized with SAM molecules enhance the surface-specific interaction with gas analytes due to the presence of SAM functional groups; hence, improves the sensor selectivity. [4,5] In this review article, the above-mentioned strategies to improve the sensing performance of MOXs nanowires based chemoresistive sensors have been reviewed. In particular, attention has been paid to summarize the gas sensing mechanism suggested by the authors along with improvement in the sensor response, detection limits and working temperatures. The last decade's works have been reviewed in this review article. Moreover, the working principle of conductometric gas sensors, gas sensing mechanism, and synthesis techniques were briefly discussed.Metal oxides (MOXs), in the form of nanowires, have proved to be an excellent active sensing layer of chemoresistive sensors due to their unique physical/chemical properties such as single crystallinity, exceptional electrical properties, and so on. Indeed, MOXs nanowires-based gas sensors show fast dynamic response with excellent reproducibility, stability, and reactivity toward various gas analytes. However, their limited selectivity and high operation temperature that lead to high power consumption are still major issues that need to be addressed. To improve these characteristics, researchers nowadays are working in th...

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Bimetal Au-Pd decorated hierarchical WO3 nanowire bundles for gas sensing application

Cited by 65 publications

References 63 publications

Au-Decorated WS2 Microflakes Based Sensors for Selective Ammonia Detection at Room Temperature

Au-Decorated WS2 Microflakes Based Sensors for Selective Ammonia Detection at Room Temperature

Advanced developments in nonstoichiometric tungsten oxides for electrochromic applications

Materials Engineering Strategies to Control Metal Oxides Nanowires Sensing Properties

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