Hydrogen gas sensing of Co3O4-Decorated WO3 nanowires

Park, Sunghoon; Sun, Guang–Zhen; Kheel, Hyejoon; Hyun, Soong Keun; Jin, Changhyun; Lee, Chongmu

doi:10.1007/s12540-015-5376-8

Cited by 31 publications

(8 citation statements)

References 38 publications

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“…The widely accepted gas sensing mechanism of MOS sensors is based on the resistance change when the sensor was switched from air to target gas, which is closely related with gas adsorption, desorption and chemical reaction on surface of the sensing materials [30]. ZnO is a typical n-type semiconductor, and the charge carriers in its conduction band (E CB ) are dominated by electrons.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Xiao

Zhang

et al. 2019

Nanomaterials

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UV light-assisted gas sensors based on metal oxide semiconductor (MOS) have attracted much attention in detecting flammable and explosive gases at room temperature. In this paper, graphite-based carbon nitride (g-C3N4) nanosheets-decorated ZnO porous hollow microspheres (PHMSs) with the size about 3~5 μm in diameter were successfully synthesized by annealing the solvothermally-synthesized Zn5(CO3)2(OH)6 PHMSs together with g-C3N4. The synthesized samples were characterized by XRD, SEM, TEM, FT-IR and XPS. The results indicated that the prepared g-C3N4/ZnO PHMSs were constructed by numerous loosely stacked ZnO nanoparticles of 20~30 nm in diameter. Gas sensing tests indicated that under UV light (365~385 nm) illumination, the sensors fabricated with g-C3N4/ZnO HPMSs showed an enhanced response and faster response speed than the pure ZnO counterpart at room temperature. In addition, the g-C3N4/ZnO sensor also exhibited good repeatability and long-term stability for CH4 detection.

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Section: Resultsmentioning

confidence: 99%

Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Xiao

Zhang

et al. 2019

Nanomaterials

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“…As a result, the NiO-decorated Nb 2 O 5 nanocomposites exhibit an improved gas sensing property to H 2 . The enhanced gas sensing performances of the Co 3 O 4 -decorated WO 3 nanowires [124], SnO 2 -Co 3 O 4 composite nanofibres [67], CuO-loaded In 2 O 3 nanofibres [125], hierarchical SnO/SnO 2 nanocomposites [126], ZnO nanowire arrays/CuO nanospheres heterostructures [127] and p-NiS/n-In 2 O 3 heterojunction nanocomposites [34] towards reducing gases can also be attributed to the reasons listed above.…”

Section: Enhanced Gas Sensing Mechanisms To Reducing Gasesmentioning

confidence: 95%

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Yang

Lei

et al. 2021

Nanomaterials

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The construction of heterojunctions has been widely applied to improve the gas sensing performance of composites composed of nanostructured metal oxides. This review summarises the recent progress on assembly methods and gas sensing behaviours of sensors based on nanostructured metal oxide heterojunctions. Various methods, including the hydrothermal method, electrospinning and chemical vapour deposition, have been successfully employed to establish metal oxide heterojunctions in the sensing materials. The sensors composed with the built nanostructured heterojunctions were found to show enhanced gas sensing performance with higher sensor responses and shorter response times to the targeted reducing or oxidising gases compare with those of the pure metal oxides. Moreover, the enhanced gas sensing mechanisms of the metal oxide-based heterojunctions to the reducing or oxidising gases are also discussed, with the main emphasis on the important role of the potential barrier on the accumulation layer.

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“…spin-coating, [19] drop-casting, [20] and solution-processable techniques [21,22] were reported in the literature. In one such work, NiO-decorated SnO 2 nanowires were synthesized via thermal evaporation (nanowires) and DC sputtering (NiO).…”

Section: Synthesis Of Tailored Moxs Nanowires Structures For Gas Sensingmentioning

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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Hydrogen gas sensing of Co3O4-Decorated WO3 nanowires

Cited by 31 publications

References 38 publications

Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Synthesis of g-C3N4-Decorated ZnO Porous Hollow Microspheres for Room-Temperature Detection of CH4 under UV-Light Illumination

Metal Oxide Based Heterojunctions for Gas Sensors: A Review

Materials Engineering Strategies to Control Metal Oxides Nanowires Sensing Properties

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