Flexible Electronics: Highly Flexible and Transparent Multilayer MoS<sub>2</sub> Transistors with Graphene Electrodes (Small 19/2013)

Yoon, Jongwon; Park, Woojin; Bae, Ga-Yeong; Kim, Yonghun; Jang, Hun Soo; Hyun, Yujun; Lim, Sung Kwan; Kahng, Yung Ho; Hong, Woong-Ki; Lee, Byoung Hun; Ko, Heung Cho

doi:10.1002/smll.201370112

Cited by 125 publications

(75 citation statements)

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“…While the bulk phase exhibits a semiconductor character with an indirect gap, the single layer presents a direct gap [1][2][3]. This interesting and promising property can be exploited for applications in nanoelectronics, optoelectronics, spintronics, catalysis, and energy storage [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

González

Dappe

2017

Phys. Rev. B

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Based on simultaneous force and conductance simulations, a proof of concept for a potential method of molecular detection is presented. Using density functional theory calculations, a metallic tip has been approached to different small inorganic molecules such as CO, CO 2 , H 2 O, NO, N 2 , or O 2 . The molecules have been previously chemisorbed on a defect formed by two Mo atoms occupying a S divacancy on a MoS 2 monolayer where they are strongly bonded to the topmost substitutional molybdenum. At that site, the fixed molecules can be imaged by a conductive atomic-force-microscopy tip. Due to the differences in atomic composition and electronic configurations, each molecule yields specific conductance/force curves during the tip approach. A molecule-tip contact is established at the force minimum, followed by the formation of a characteristic plateau in the conductance in most of the cases. Focusing our attention on the position and values of such force minimum and conductance maximum, we can conclude that both characteristic properties can give a clear signature of each molecule, proposing a different method of detecting molecules adsorbed on highly reactive sites.

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Section: Introductionmentioning

confidence: 99%

Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

González

Dappe

2017

Phys. Rev. B

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“…One particularly promising application for the 2D crystals is flexible electronics, because of their strong in-plane bonding and high flexibility [8][9][10][11][12][13] . MoS 2 atomic layers are competitive candidates with suitable electronic structures [14][15][16] .…”

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confidence: 99%

“…In addition, the MoS 2 -based field effect transistors have shown outstanding performances with high ON/OFF ratios 6 . Moreover, high-performance MoS 2 thin-film transistors and gas sensors have been fabricated on flexible substrates [10][11][12][13] . It is important to study the 2D-MoS 2 mechanical properties for their reliable applications in flexible electronic devices.…”

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confidence: 99%

Nanomechanical cleavage of molybdenum disulphide atomic layers

et al. 2014

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The discovery of two-dimensional materials became possible due to the mechanical cleavage technique. Despite its simplicity, the as-cleaved materials demonstrated surprising macrocontinuity, high crystalline quality and extraordinary mechanical and electrical properties that triggered global research interest. Here such cleavage processes and associated mechanical behaviours are investigated by a direct in situ transmission electron microscopy probing technique, using atomically thin molybdenum disulphide layers as a model material. Our technique demonstrates layer number selective cleavage, from a monolayer to double layer and up to 23 atomic layers. In situ observations combined with molecular dynamics simulations reveal unique layer-dependent bending behaviours, from spontaneous rippling (o5 atomic layers) to homogeneous curving (B 10 layers) and finally to kinking (20 or more layers), depending on the competition of strain energy and interfacial energy.

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“…These properties suggest that monolayer MX 2 has the potential to be candidate within flexible 2D nano-optoelectronics. Mechanical strain is an important parameter in determining the performance of flexible devices 20 21 22 23 24 25 26 27 . It can strongly modify electronic structure and optical properties of 2D semiconductors.…”

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Surface enhanced Raman scattering of monolayer MX2 with metallic nano particles

Zhang

Yang

et al. 2016

Sci Rep

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Monolayer transition metal dichalcogenides MX2 (M = Mo, W; X = S) exhibit remarkable electronic and optical properties, making them candidates for application within flexible nano-optoelectronics. The ability to achieve a high optical signal, while quantitatively monitoring strain in real-time is the key requirement for applications in flexible sensing and photonics devices. Surface-enhanced Raman scattering (SERS) allows us to achieve both simultaneously. However, the SERS depends crucially on the size and shape of the metallic nanoparticles (NPs), which have a large impact on its detection sensitivity. Here, we investigated the SERS of monolayer MX2, with particular attention paid to the effect of the distribution of the metallic NPs. We show that the SERS depends crucially on the distribution of the metallic NPs and also the phonon mode of the MX2. Moreover, strong coupling between MX2 and metallic NPs, through surface plasmon excitation, results in splitting of the and modes and an additional peak becomes apparent. For a WS2-Ag system the intensity of the additional peak increases exponentially with local strain, which opens another interesting window to quantitatively measure the local strain using SERS. Our experimental study may be useful for the application of monolayer MX2 in flexible nano-optoelectronics.

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Flexible Electronics: Highly Flexible and Transparent Multilayer MoS₂ Transistors with Graphene Electrodes (Small 19/2013)

Cited by 125 publications

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Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

Nanomechanical cleavage of molybdenum disulphide atomic layers

Surface enhanced Raman scattering of monolayer MX2 with metallic nano particles

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Flexible Electronics: Highly Flexible and Transparent Multilayer MoS2 Transistors with Graphene Electrodes (Small 19/2013)

Cited by 125 publications

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Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

Molecular detection on a defective MoS2 monolayer by simultaneous conductance and force simulations

Nanomechanical cleavage of molybdenum disulphide atomic layers

Surface enhanced Raman scattering of monolayer MX2 with metallic nano particles

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Flexible Electronics: Highly Flexible and Transparent Multilayer MoS₂ Transistors with Graphene Electrodes (Small 19/2013)