Hydrothermally synthesized MoS2-multi-walled carbon nanotube composite as a novel room-temperature ammonia sensing platform

Singh, Sukhwinder; Sharma, Satinder K.; Singh, Ravi Chand; Sharma, Sandeep

doi:10.1016/j.apsusc.2020.147373

Cited by 74 publications

(82 citation statements)

References 68 publications

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“…The combination between MoS 2 and carbon-based materials has been widely investigated due to the synergistic effects between the good sensitivity of MoS 2 with the good conductivity and high specific surface area of carbon-based materials. For instance, Sing et al [232] reported the formation of MoS 2 /CNTs heterostructures to detect NH 3 gas at RT. The addition of CNTs into MoS 2 increased the specific surface area.…”

Section: Heterostructures Couplingmentioning

confidence: 99%

“…For instance, Sing et al . [ 232 ] reported the formation of MoS 2 /CNTs heterostructures to detect NH 3 gas at RT. The addition of CNTs into MoS 2 increased the specific surface area.…”

Section: Molybdenum Disulfide (Mos 2 ) Gas Sensing Materialsmentioning

confidence: 99%

Section: Molybdenum Disulfide (Mos 2 ) Gas Sensing Materialsmentioning

confidence: 99%

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Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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Molybdenum-based materials have been intensively investigated for high-performance gas sensor applications. Particularly, molybdenum oxides and dichalcogenides nanostructures have been widely examined due to their tunable structural and physicochemical properties that meet sensor requirements. These materials have good durability, are naturally abundant, low cost, and have facile preparation, allowing scalable fabrication to fulfill the growing demand of susceptible sensor devices. Significant advances have been made in recent decades to design and fabricate various molybdenum oxides- and dichalcogenides-based sensing materials, though it is still challenging to achieve high performances. Therefore, many experimental and theoretical investigations have been devoted to exploring suitable approaches which can significantly enhance their gas sensing properties. This review comprehensively examines recent advanced strategies to improve the nanostructured molybdenum-based material performance for detecting harmful pollutants, dangerous gases, or even exhaled breath monitoring. The summary and future challenges to advance their gas sensing performances will also be presented.

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Section: Heterostructures Couplingmentioning

confidence: 99%

“…For instance, Sing et al . [ 232 ] reported the formation of MoS 2 /CNTs heterostructures to detect NH 3 gas at RT. The addition of CNTs into MoS 2 increased the specific surface area.…”

Section: Molybdenum Disulfide (Mos 2 ) Gas Sensing Materialsmentioning

confidence: 99%

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Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

et al. 2021

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“…This may be attributed to the effect of the hydrothermal treatment that caused GO reduction and the disappearance of most of the oxygen-containing functional groups, resulting in the formation of numerous defects in the composite structure. Some of these defect positions combine with MoS 2 to form a new interlayer structure [34]. This new type of defect location provides active energy sites for the adsorption of various gas molecules, which is beneficial for the improvement of gas sensitivity.…”

Section: Powder Xrd Analysismentioning

confidence: 99%

Flexible Low-Temperature Ammonia Gas Sensor Based on Reduced Graphene Oxide and Molybdenum Disulfide

et al. 2021

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Owing to harsh working environments and complex industrial requirements, traditional gas sensors are prone to deformation damage, possess a limited detection range, require a high working temperature, and display low reliability, thereby necessitating the development of flexible and low-temperature gas sensors. In this study, we developed a low-temperature polyimide (PI)-based flexible gas sensor comprising a reduced graphene oxide (rGO)/MoS2 composite. The micro-electro-mechanical system technology was used to fabricate Au electrodes on a flexible PI sheet to form a “sandwiched” sensor structure. The rGO/MoS2 composites were synthesized via a one-step hydrothermal method. The gas-sensing response was the highest for the composite comprising 10% rGO. The structure of this material was characterized, and a PI-based flexible gas sensor comprising rGO/MoS2 was fabricated. The optimal working temperature of the sensor was 141 °C, and its response-recovery time was significantly short upon exposure to 50–1500 ppm NH3. Thus, this sensor exhibited high selectivity and a wide NH3 detection range. Furthermore, it possessed the advantages of low power consumption, a short response-recovery time, a low working temperature, flexibility, and variability. Our findings provide a new framework for the development of pollutant sensors that can be utilized in an industrial environment.

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“…Indeed, 2D MoS 2 and MoSe 2 nanosheets have been used for the detection of various gases, for instance, H 2 S, NO, NO 2 , and NH 3 . 16 , 28 − 34 Yuan et al have shown a highly responsive MoS 2 nanosheet-based formic acid sensor. 35 Previous results indicate that the sensing features of MoS 2 nanosheets are strongly influenced by ambient oxygen.…”

Section: Introductionmentioning

confidence: 99%

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite

et al. 2021

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Layered two-dimensional transition metal dichalcogenides, due to their semiconducting nature and large surface-to-volume ratio, have created their own niche in the field of gas sensing. Their large recovery time and accompanied incomplete recovery result in inferior sensing properties. Here, we report a composite-based strategy to overcome these issues. In this study, we report a facile double-step synthesis of a MoS 2 /SnO 2 composite and its successful use as a superior room-temperature ammonia sensor. Contrary to the pristine nanosheet-based sensors, the devices made using the composite display superior gas sensing characteristics with faster response. Specifically, at room temperature (30° C), the composite-based sensor exhibited excellent sensitivity (10%) at an ammonia concentration down to 0.4 ppm along with the response and recovery times of 2 and 10 s, respectively. Moreover, the device also exhibited long-term durability, reproducibility, and selectivity toward ammonia against hydrogen sulfide, methanol, ethanol, benzene, acetone, and formaldehyde. Sensor devices made on quartz and alumina substrates with different roughnesses have yielded almost an identical response, except for slight variations in response and recovery transients. Further, to shed light on the underlying adsorption energetics and selectivity, density functional theory simulations were employed. The improved response and enhanced selectivity of the composite were explicitly discussed in terms of adsorption energy. Lowdin charge analysis was performed to understand the charge transfer mechanism between NH 3 , H 2 S, CH 3 OH, HCHO, and the underlying MoS 2 /SnO 2 composite surface. The long-term durability of the sensor was evident from the stable response curves even after 2 months. These results indicate that hydrothermally synthesized MoS 2 /SnO 2 composite-based gas sensors can be used as a promising sensing material for monitoring ammonia gas in real fields.

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Hydrothermally synthesized MoS2-multi-walled carbon nanotube composite as a novel room-temperature ammonia sensing platform

Cited by 74 publications

References 68 publications

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Flexible Low-Temperature Ammonia Gas Sensor Based on Reduced Graphene Oxide and Molybdenum Disulfide

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite

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Hydrothermally synthesized MoS2-multi-walled carbon nanotube composite as a novel room-temperature ammonia sensing platform

Cited by 74 publications

References 68 publications

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Advanced Strategies to Improve Performances of Molybdenum-Based Gas Sensors

Flexible Low-Temperature Ammonia Gas Sensor Based on Reduced Graphene Oxide and Molybdenum Disulfide

Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS2/SnO2 Composite

Contact Info

Product

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Superior Room-Temperature Ammonia Sensing Using a Hydrothermally Synthesized MoS₂/SnO₂ Composite