Charge-transfer-based Gas Sensing Using Atomic-layer MoS2

Cho, Byungjin; Hahm, Myung Gwan; Choi, Minseok; Yoon, Jongwon; Kim, Ah Ra; Lee, Young Joo; Park, Sung Gyu; Kwon, Jung Dae; Kim, Chang-Su; Song, Myungkwan; Jeong, Yongsoo; Nam, Kee Seok; Lee, Sangchul; Yoo, Tae Jin; Kang, Chang Goo; Lee, Byoung Hun; Ko, Heung Cho; Ajayan, Pulickel M.; Kim, Dong Ho

doi:10.1038/srep08052

Cited by 526 publications

(321 citation statements)

References 35 publications

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“…The MoS2 crystal (Figure 11) consists of a metal Mo layer sandwiched between two S layers, with these triple layers stacking together to form a layered structure [49]. The image of the as-synthesised MoS2 film on the 2-inch sapphire substrate reveals the semi-transparent characteristics of the assynthesized film consisting of the three MoS2 layers.…”

Section: Tmds Layered Materialsmentioning

confidence: 99%

Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

112

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Abstract:Since the first report of graphene, thin two-dimensional (2D) nanomaterials with atomic or molecular thicknesses have attracted great research interest for gas sensing applications. This was due to the distinctive physical, chemical, and electronic properties related to their ultrathin thickness, which positively affect the gas sensing performances. This feature article discusses the latest developments in this field, focusing on the properties, preparation, and sensing applications of thin 2D inorganic nanomaterials such as single-or few-layer layered double hydroxides/transition metal oxides/transition metal dichalcogenides. Recent studies have shown that thin 2D inorganic nanomaterials could provide monitoring of harmful/toxic gases with high sensitivity and a low concentration detection limit by means of conductometric sensors operating at relatively low working temperatures. Promisingly, by using these thin 2D inorganic nanomaterials, it may open a simple way of improving the sensing capabilities of conductometric gas sensors.

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Section: Tmds Layered Materialsmentioning

confidence: 99%

Thin 2D: The New Dimensionality in Gas Sensing

Neri

2017

Chemosensors

112

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“…Cho et al developed a highly sensitive and selective gas sensor using uniform atomic-layered MoS2 synthesized by thermal CVD for the detection of NO2 and NH3 [160]. The charge transfer mechanism was evident from in situ photoluminescence characterizations and theoretical calculations.…”

Section: Transition Metal Dichalcogenides (Tmds)mentioning

confidence: 99%

Two-Dimensional Materials for Sensing: Graphene and Beyond

Varghese²,

et al. 2015

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Two-dimensional materials have attracted great scientific attention due to their unusual and fascinating properties for use in electronics, spintronics, photovoltaics, medicine, composites, etc. Graphene, transition metal dichalcogenides such as MoS2, phosphorene, etc., which belong to the family of two-dimensional materials, have shown great promise for gas sensing applications due to their high surface-to-volume ratio, low noise and sensitivity of electronic properties to the changes in the surroundings. Two-dimensional nanostructured semiconducting metal oxide based gas sensors have also been recognized as successful gas detection devices. This review aims to provide the latest advancements in the field of gas sensors based on various two-dimensional materials with the main focus on sensor performance metrics such as sensitivity, specificity, detection limit, response time, and reversibility. Both experimental and theoretical studies on the gas sensing properties of graphene and other two-dimensional materials beyond graphene are also discussed. The article concludes with the current challenges and future prospects for two-dimensional materials in gas sensor applications. OPEN ACCESSElectronics 2015, 4 652

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“…In order to observe charge transfer of electron acceptor and donor, NO 2 and NH 3 , respectively, were used. 3,20 As BP-based FETs show p-type characteristics in air ambient, the charge transfer caused by the adsorption of NO 2 gas molecules on the surface of BP film increases the electrical conductivity (Figure 2a) and shifts I DS -V GS curve toward the positive side (Figure 2c). 6,7,13 On the other hand, NH 3 adsorption reduces the current level ( Figure 2b) and shifts I DS -V GS curve toward the negative side.…”

Section: Resultsmentioning

confidence: 99%

Chemical Doping Effects of Gas Molecules on Black Phosphorus Field-Effect Transistors

Kim

Lee

Kim

2018

ECS J. Solid State Sci. Technol.

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Black phosphorus (BP) is a recently rediscovered layered material with outstanding optical and electrical properties. Its large adsorption energy and high surface-to-volume ratio have motivated chemical sensing and doping applications. We analyzed the charge transport properties as BP-based field-effect transistors (FETs) were chemically doped by adsorption of gas molecules. The electron-withdrawing NO 2 and the electron-donating NH 3 molecules were applied to observe p-doping and n-doping behaviors, respectively, in BP channel layer. Y-function method was used to extract the device parameters, allowing us to elucidate the chemical doping effects of different types of gas molecules in BP FETs. Excellent sensing ability of BP-based devices to gas molecules was also demonstrated. Our results provide a facile method to control the device properties of BP-based FET via the chemical doping. Two-dimensional (2D) materials have attracted a significant attention for their unique optical and electrical properties. The atomic layers are held to each other by van der Waals interaction and therefore can be easily exfoliated into high-quality nanoscale films. With their atomic thickness, 2D materials have inherent high surface-to-volume ratios that can be a great advantage in semiconductor optoelectronics requiring nanoscale devices with high performance.1,2 The higher the surface-to-volume ratio, the more active sites will be available for sensing in a fixed size device. Different 2D layered materials including graphene and transition metal dichalcogenides (TMDCs) were applied to chemical and gas sensors and showed excellent sensing properties. 3-5Black phosphorus (BP) has been highlighted as a promising 2D material with thickness-dependent direct bandgap and excellent electrical properties comparable to those of graphene or other layered materials. The outstanding performance as a transistor material was proved by its high carrier mobility and drain current modulation reaching 1,000 cm 2 /V·s and 10 5 , respectively. 6,7 Its distinctive sensitivity was also observed to be higher than other 2D materials as it has larger adsorption energy and puckered structure that leads to even higher surface-tovolume ratio and increased adsorption sites. 8,9 Thus, there have been various studies on high-performance BP-based chemical sensors; ultrasensitive and selective responses to NO 2 gas, water molecules or ions were reported.10-13 Abbas et al. reported on chemical sensing of NO 2 using BP-based field-effect transistors (FETs) and Cho et al. demonstrated superior chemical sensing performance of BP by comparing to those of molybdenum disulfide and graphene. 8,13 Cui et al. also studied ultrahigh sensitivity along with the thickness-dependent sensing properties of BP.14 Lee et al. fabricated suspended BP-based sensors to enhance the sensing performance. 15Although the high performance of BP-based chemical sensors has been demonstrated through previous reports, the chemical doping effects and the change in the device parameters caused by...

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Charge-transfer-based Gas Sensing Using Atomic-layer MoS2

Cited by 526 publications

References 35 publications

Thin 2D: The New Dimensionality in Gas Sensing

Thin 2D: The New Dimensionality in Gas Sensing

Two-Dimensional Materials for Sensing: Graphene and Beyond

Chemical Doping Effects of Gas Molecules on Black Phosphorus Field-Effect Transistors

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