Thermal stability of WS2 flakes and gas sensing properties of WS2/WO3 composite to H2, NH3 and NO2

Perrozzi, Francesco; Emamjomeh, Seyed Mahmoud; Paolucci, Valentina; Taglieri, Giuliana; Ottaviano, L.; Cantalini, C.

doi:10.1016/j.snb.2016.12.069

Cited by 224 publications

(139 citation statements)

References 60 publications

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“…According to a recent report, for 2D WS 2 nanoparticles the replacement of S with O occurs even at room temperature, resulting in the formation of some amorphous/crystalline WO 3 phase in the nanoflakes below/above 250 °C [36]. However, the very efficient and fast recovery of the WS 2 structure even after a short treatment in 1 ppm H 2 S is unexpected and has important consequences for the sensing of H 2 S in the presence of O 2 (e.g., in ambient air).…”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

et al. 2018

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Owing to their higher intrinsic electrical conductivity and chemical stability with respect to their oxide counterparts, nanostructured metal sulfides are expected to revive materials for resistive chemical sensor applications. Herein, we explore the gas sensing behavior of WS 2 nanowire-nanoflake hybrid materials and demonstrate their excellent sensitivity (0.043 ppm-1) as well as high selectivity towards H 2 S relative to CO, NH 3 , H 2 , and NO (with corresponding sensitivities of 0.002, 0.0074, 0.0002, and 0.0046 ppm-1 , respectively). Gas response measurements, complemented with the results of X-ray photoelectron spectroscopy analysis and first-principles calculations based on density functional theory, suggest that the intrinsic electronic properties of pristine WS 2 alone are not sufficient to explain the observed high sensitivity towards H 2 S. A major role in this behavior is also played by O doping in the S sites of the WS 2 lattice. The results of the present study open up new avenues for the use of transition metal disulfide nanomaterials as effective alternatives to metal oxides in future applications for industrial process control, security, and health and environmental safety.

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Section: Resultsmentioning

confidence: 99%

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

et al. 2018

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“…Besides MoS 2 , other metal dichalcogenides such as WS 2 , MoSe 2 and SnS 2 have also shown promise for gas sensing properties. Huo et al studied the photoelectrical gas sensing properties of a FET sensor based on WS 2 nanoflakes obtained by exfoliation.…”

Section: Gas Sensor Using 2d Nanostructuresmentioning

confidence: 99%

Two‐Dimensional Nanostructured Materials for Gas Sensing

Liu

Pinna

et al. 2017

Adv Funct Materials

695

356

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Two-dimensional (2D) nanostructures are highly attractive for fabricating nanodevices due to their high surface-to-volume ratio and good compatibility with device design. In recent years 2D nanostructures of various materials including metal oxides, graphene, metal dichalcogenides, phosphorene, BN and MXenes, have demonstrated significant potential for gas sensors. This review aims to provide the most recent advancements in utilization of various 2D nanomaterials for gas sensing. The common methods for the preparation of 2D nanostructures are briefly summarized first. The focus is then placed on the sensing performances provided by devices integrating 2D nanostructures. Strategies for optimizing the sensing features are also discussed. By combining both the experimental results and the theoretical studies available, structure-properties correlations are discussed. The conclusion gives some perspectives on the open challenges and future prospects for engineering advanced 2D nanostructures for high-performance gas sensors devices.

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“…For instance, Schottky barrier was suggested as the reason for enhanced NO 2 detection with Pt nanoparticle-modified MoS 2 [83]. SnO 2 and WO 3 nanocrystals were demonstrated contributing to the selective detection of NO 2 with MoS 2 and WS 2 [12,38]. Ag nanowire-functionalized WS 2 exhibited enhanced sensitivity and recovery property for NO 2 due to the n-doping effect and low surface energy of Ag [15].…”

Section: Gas Sensingmentioning

confidence: 99%

“…Take gas sensor as an example, MOSFET H 2 sensors show detection limits in the range of hundreds to thousands ppm [34], and MOSFET NO 2 sensors show detection limits over ppm level [35]. In contrast, 2D TMDC FET H 2 sensors have detection limits of several ppm [36][37][38] and the detection limits of NO 2 have reached ppb level [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Environmental Analysis with 2D Transition-Metal Dichalcogenide-Based Field-Effect Transistors

2020

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• Recent advances of two-dimensional (2D) transition-metal dichalcogenide (TMDC)-based field-effect transistor (FET) sensors for environmental analysis are summarized. • Representative TMDC FET sensors in gaseous and aqueous media analysis are introduced. • Challenges and future research directions of 2D TMDC FET sensors are discussed. ABSTRACT Field-effect transistors (FETs) present highly sensitive, rapid, and in situ detection capability in chemical and biological analysis. Recently, two-dimensional (2D) transition-metal dichalcogenides (TMDCs) attract significant attention as FET channel due to their unique structures and outstanding properties. With the booming of studies on TMDC FETs, we aim to give a timely review on TMDCbased FET sensors for environmental analysis in different media. First, theoretical basics on TMDC and FET sensor are introduced. Then, recent advances of TMDC FET sensor for pollutant detection in gaseous and aqueous media are, respectively, discussed. At last, future perspectives and challenges in practical application and commercialization are given for TMDC FET sensors. This article provides an overview on TMDC sensors for a wide variety of analytes with an emphasize on the increasing demand of advanced sensing technologies in environmental analysis.

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Thermal stability of WS2 flakes and gas sensing properties of WS2/WO3 composite to H2, NH3 and NO2

Cited by 224 publications

References 60 publications

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

Two‐Dimensional Nanostructured Materials for Gas Sensing

Environmental Analysis with 2D Transition-Metal Dichalcogenide-Based Field-Effect Transistors

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