Enhanced adsorption sites in monolayer MoS2 pyramid structures for highly sensitive and fast hydrogen sensor

Agrawal, Abhay V.; Kumar, Rahul; Yang, Guang; Bao, Jiming; Kumar, Mahesh; Kumar, Mukesh

doi:10.1016/j.ijhydene.2020.01.119

Cited by 38 publications

(21 citation statements)

References 63 publications

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“…However, because TMDs have a high reactivity to such gases with high polarity, it is difficult to develop highly sensitive and selective H 2 sensors using pure 2D TMDs. Although some pure TMD-based nanostructures were reported as efficient H 2 sensors, , the selectivity was not presented in the articles. Therefore, it is imperative to combine catalysts for H 2 sensing with TMDs, in order to develop TMD-based H 2 sensors with high H 2 selectivity against interfering gases.…”

Section: Other Materialsmentioning

confidence: 99%

Chemiresistive Hydrogen Sensors: Fundamentals, Recent Advances, and Challenges

et al. 2020

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Hydrogen (H 2 ) is one of the next-generation energy sources because it is abundant in nature and has a high combustion efficiency that produces environmentally benign products (H 2 O). However, H 2 /air mixtures are explosive at H 2 concentrations above 4%, thus any leakage of H 2 must be rapidly and reliably detected at much lower concentrations to ensure safety. Among the various types of H 2 sensors, chemiresistive sensors are one of the most promising sensing systems due to their simplicity and low cost. This review highlights the advances in H 2 chemiresistors, including metal-, semiconducting metal oxide-, carbon-based materials, and other materials. The underlying sensing mechanisms for different types of materials are discussed, and the correlation of sensing performances with nanostructures, surface chemistry, and electronic properties is presented. In addition, the discussion of each material emphasizes key advances and strategies to develop superior H 2 sensors. Furthermore, recent key advances in other types of H 2 sensors are briefly discussed. Finally, the review concludes with a brief outlook, perspective, and future directions.

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Section: Other Materialsmentioning

confidence: 99%

Chemiresistive Hydrogen Sensors: Fundamentals, Recent Advances, and Challenges

et al. 2020

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“…TMDs materials not only have excellent electrical properties similar to graphene but also have semiconductor energy band structure, which have been considered to be a promising sensing material. In the TMDs family, MoS 2 and WS 2 as typical 2D materials have attracted the most attention because of their wider band gap structure (1-3 eV) and excellent physical and chemical properties [25][26][27]. In particular, relative to WS 2 based chemical gas sensors, Li et al fabricated an ammonia gas sensor used WS 2 nanoflakes as the sensing material, which can work at room temperature and displayed high selectivity to ammonia gas [28].…”

Section: Introductionmentioning

confidence: 99%

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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“…[10][11][12][13][14][15] While CVD can reproduce horizontal layers as found in naturally occurring TMDs, adjusting the growth conditions enables the growth of nanostructures with exciting properties and applications in nanotechnology, for instance vertical walls, owers and pyramids. 16 Under certain CVD growth parameters TMDs materials form pyramid-like structures, 17,18 having many active adsorption site useful for applications in hydrogen sensors 19 and water disinfection, 20 at the same time possessing interesting electronic properties like ferromagnetism 21 and high mobility. 22,23 Moreover, pyramid-like TMDs structures have applications in non-linear optics, 22,24,25 as they exhibit higher non-linear optical conversion efficiency than monolayers due to the thickness increase, while demonstrating a much larger nonlinear optical response than multilayer TMDs.…”

Section: Introductionmentioning

confidence: 99%

“…22,24,25 In most, the TMDs spirals and pyramids are studied using Raman spectroscopy. [17][18][19][20][21][22][23][24] However, comparing the measured optical response of pyramid-like structures of different studies needs to be done with caution, as the terms spiral ake or pyramid are used for nanostructures that have different thicknesses, geometry and sizes.…”

Section: Introductionmentioning

confidence: 99%