Plasmonic Au Nanoparticles Sensitized MoS₂ for Bifunctional NO₂ and Light Sensing
15 Feb 2021-IEEE Sensors Journal (Institute of Electrical and Electronics Engineers (IEEE))-Vol. 21, Iss: 4, pp 4190-4197
TL;DR: In this article, plasmonic Au nanoparticles functionalized MoS2 device showed about 5 times higher sensitivity to NO2 than that of pristine MoS 2 at room temperature, attributed to a combination of Schottky barriers modulation at Au/MoS2 nanointerfaces and catalytic effects upon exposing the gas analyte.
Abstract: The possibility to synergise two-dimensional (2D) materials with 0D nanoparticles has sparked a surge in high performance futuristic electronic devices. Here, we decorated plasmonic Au nanoparticles on surface of chemical vapor deposition (CVD) grown 2D MoS2 nanosheet and demonstrated bifunctional sensing behaviour within a single device. The plasmonic Au nanoparticles functionalized MoS2 device showed about ~5 times higher sensitivity to NO2 than that of pristine MoS2 at room temperature. The enhanced gas sensing performance was attributed to a combination of Schottky barriers modulation at Au/MoS2 nanointerfaces and catalytic effects upon exposing the gas analyte. In addition, the device also exhibited enhanced photoresponse with a high photo-responsivity of ~17.6 A/W and a moderate detectivity of ~ ${6.6} \times {10}^{11}$ Jones due to enhanced local plasmonic effects. Finally, photons and gas molecules are detected in sequence, which proved that only a single Au-MoS2 device exhibited remarkable bifunctional sensing characteristics. Such excellent bifunctional sensing ability of a single Au-MoS2 device paves the way to integrate the 2D material with plasmonic nanostructures for developing an advanced multifunctional sensor.
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07 Jun 2021
24 citations
TL;DR: In this paper , a dual-functional sensor that uses hybrid amorphous ZnSnO (a-ZTO)/graphene nanosheet (GNS) composite films was developed.
13 citations
TL;DR: In this article, a dual-functional sensor that uses hybrid amorphous ZnSnO (a-ZTO)/graphene nanosheet (GNS) composite films was developed.
13 citations
TL;DR: In this article , a visible light-assisted type gas sensor based on Au-decorated WS2 was proposed, which achieved high performance detection of NO2 at room temperature by taking full advantage of the localized surface plasmon resonance (LSPR) enhancement effect induced by the modified Au nanoparticles (NPs).
Abstract: Transition metal dichalcogenides (TMDs) have been received widespread attention for NO2 detection at room temperature. However, the TMDs-based gas sensors usually possess inferior response capability and suffer from humidity interference due to lack of sufficient reaction activation energy, which seems tough to achieve the detection of ppb-level gases and hinder the practical applications. Herein, we propose a visible light-assisted-type gas sensor based on Au-decorated WS2, endowing high-performance detection of NO2 at room temperature. Benefited from the localized surface plasmon resonance (LSPR) enhancement effect induced by the modified Au nanoparticles (NPs), the visible light-assisted Au/WS2 gas sensor can implement the detection of NO2 gas as low as 20 ppb. Moreover, the maximum drift of the sensor response value is only 3% in the range of 10%−90% RH, indicating the stabilized anti-humidity ability. The effective regulation of transmission channel by the modified noble metal and the enhancement of visible light absorption of WS2 through taking full advantage of the LSPR effect are the main reasons for realizing low concentration detection and improving the anti-humidity ability. Therefore, the visible light-assisted gas detection mode can serve as a proof-of-concept to provide an effective approach for the detection of trace gases at room temperature.
7 citations
TL;DR: In this article , the authors explored the localized surface plasmon resonance (LSPR) effect on gas-sensitive features via the design of a visible-light-assisted gas sensor using [email protected]2 core-shell heterostructures as sensitive materials.
Abstract: Developing high-performance gas-sensing devices based on transition metal dichalcogenides (TMDs) has sparked significant research interest in efficient detection of hazardous gases at room temperature. Considering that the gas-sensing performances of TMDs-based sensors can be effectively improved by the localized surface plasmon resonance (LSPR) effect of decorated noble-metal nanoparticles, herein, we explored the LSPR effect on gas-sensitive features via the design of a visible-light-assisted gas sensor using [email protected]2 core-shell heterostructures as sensitive materials. The internal connection between the optical absorption and the gas-sensing properties of [email protected]2 heterostructures was investigated. Intriguingly, under the activation of indoor white-light, the optimized [email protected]2 sensor displayed an enhanced response by more than 8 times and elevated recoverability from 60% to 98% almost without baseline shift as compared with the pure MoS2 gas sensor for the detection of NO2 (1 ppm). The combination of experimental and theoretical analysis indicates that the improved gas-sensing performances can be primarily attributed to the effective amplification of the light absorption efficiency of MoS2 induced by the LSPR effect from the Au nanoparticle cores. These results imply a potential application in monitoring NO2 gas at room temperature and open up an effective thoughtway for developing high-performance visible-light-modulated gas sensors.
4 citations
References
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TL;DR: The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy and the effect of quantum confinement on the material's electronic structure is traced.
Abstract: The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy Through characterization by absorption, photoluminescence, and photoconductivity spectroscopy, we trace the effect of quantum confinement on the material's electronic structure With decreasing thickness, the indirect band gap, which lies below the direct gap in the bulk material, shifts upwards in energy by more than 06 eV This leads to a crossover to a direct-gap material in the limit of the single monolayer Unlike the bulk material, the MoS₂ monolayer emits light strongly The freestanding monolayer exhibits an increase in luminescence quantum efficiency by more than a factor of 10⁴ compared with the bulk material
12,822 citations
"Plasmonic Au Nanoparticles Sensitiz..." refers background in this paper
...attention of research community due to its excellent optical and electronic properties [1], [2]....
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TL;DR: The unique characteristics of incident-light control, prompt photoswitching, and good photoresponsivity from the MoS(2) phototransistor pave an avenue to develop the single-layer semiconducting materials for multifunctional optoelectronic device applications in the future.
Abstract: A new phototransistor based on the mechanically exfoliated single-layer MoS2 nanosheet is fabricated, and its light-induced electric properties are investigated in detail. Photocurrent generated from the phototransistor is solely determined by the illuminated optical power at a constant drain or gate voltage. The switching behavior of photocurrent generation and annihilation can be completely finished within ca. 50 ms, and it shows good stability. Especially, the single-layer MoS2 phototransistor exhibits a better photoresponsivity as compared with the graphene-based device. The unique characteristics of incident-light control, prompt photoswitching, and good photoresponsivity from the MoS2 phototransistor pave an avenue to develop the single-layer semiconducting materials for multifunctional optoelectronic device applications in the future.
3,033 citations
"Plasmonic Au Nanoparticles Sensitiz..." refers background in this paper
...6 A/W and a detectivity of the order of 1011 Jones were achieved for Au-MoS2 device, which is higher than many other previously reported MoS2 based photodetectors and comparable to Au@MoS2 core-shell heterostructures based photodetector [5], [28]–[30]....
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...it an interesting candidate for sensing, energy harvesting and optoelectronic applications [3]–[5]....
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TL;DR: It is reported that the high-temperature annealing of a thermally decomposed ammonium thiomolybdate layer in the presence of sulfur can produce large-area MoS(2) thin layers with superior electrical performance on insulating substrates.
Abstract: The two-dimensional layer of molybdenum disulfide (MoS2) has recently attracted much interest due to its direct-gap property and potential applications in optoelectronics and energy harvesting. However, the synthetic approach to obtain high-quality and large-area MoS2 atomic thin layers is still rare. Here we report that the high-temperature annealing of a thermally decomposed ammonium thiomolybdate layer in the presence of sulfur can produce large-area MoS2 thin layers with superior electrical performance on insulating substrates. Spectroscopic and microscopic results reveal that the synthesized MoS2 sheets are highly crystalline. The electron mobility of the bottom-gate transistor devices made of the synthesized MoS2 layer is comparable with those of the micromechanically exfoliated thin sheets from MoS2 crystals. This synthetic approach is simple, scalable, and applicable to other transition metal dichalcogenides. Meanwhile, the obtained MoS2 films are transferable to arbitrary substrates, providing gr...
1,734 citations
"Plasmonic Au Nanoparticles Sensitiz..." refers result in this paper
...Our observed values of binding energies for pristine MoS2 and Au functionalized MoS2 are consistent with previously reported values of 2H-MoS2 and suggest that the crystallinity of the MoS2 was not disturbed by the decoration of Au nanoparticles on the surface of MoS2 [15], [16]....
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TL;DR: Pd-functionalized nanostructures exhibited a dramatic improvement in sensitivity toward oxygen and hydrogen due to the enhanced catalytic dissociation of the molecular adsorbate on the Pd nanoparticle surfaces and the subsequent diffusion of the resultant atomic species to the oxide surface.
Abstract: The sensing ability of individual SnO2 nanowires and nanobelts configured as gas sensors was measured before and after functionalization with Pd catalyst particles. In situ deposition of Pd in the same reaction chamber in which the sensing measurements were carried out ensured that the observed modification in behavior was due to the Pd functionalization rather than the variation in properties from one nanowire to another. Changes in the conductance in the early stages of metal deposition (i.e., before metal percolation) indicated that the Pd nanoparticles on the nanowire surface created Schottky barrier-type junctions resulting in the formation of electron depletion regions within the nanowire, constricting the effective conduction channel and reducing the conductance. Pd-functionalized nanostructures exhibited a dramatic improvement in sensitivity toward oxygen and hydrogen due to the enhanced catalytic dissociation of the molecular adsorbate on the Pd nanoparticle surfaces and the subsequent diffusion ...
1,307 citations
Additional excerpts
...Schottky barrier modulation [24], [25]....
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TL;DR: Multilayer MoS(2) phototransistors further exhibit high room temperature mobilities, near-ideal subthreshold swings, low operating gate biases, and negligible shifts in the threshold voltages during illumination.
Abstract: Phototransistors based on multilayer MoS(2) crystals are demonstrated with a wider spectral response and higher photoresponsivity than single-layer MoS(2) phototransistors. Multilayer MoS(2) phototransistors further exhibit high room temperature mobilities (>70 cm(2) V(-1) s(-1) ), near-ideal subthreshold swings (~70 mV decade(-1) ), low operating gate biases (<5 V), and negligible shifts in the threshold voltages during illumination.
993 citations
"Plasmonic Au Nanoparticles Sensitiz..." refers background in this paper
...sensitivity of the photodetector, respectively and these are calculated by following expressions [28]....
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...6 A/W and a detectivity of the order of 1011 Jones were achieved for Au-MoS2 device, which is higher than many other previously reported MoS2 based photodetectors and comparable to Au@MoS2 core-shell heterostructures based photodetector [5], [28]–[30]....
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