Giant Moisture Responsiveness of VS<sub>2</sub> Ultrathin Nanosheets for Novel Touchless Positioning Interface

Feng, Jun; Peng, Lele; Wu, Changzheng; Sun, Xu; Hu, Shuanglin; Lin, Chenwen; Dai, Jun; Yang, Jinlong; Xie, Yi

doi:10.1002/adma.201104681

Cited by 390 publications

(340 citation statements)

References 33 publications

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“…Figure 5a shows that the humidity sensor has been utilized as a measurement device to profile the humidity level from a water surface. The measured RH, calculated from the change of capacitance, increases with the approach to the water surface, as expected, which fits very well with the theoretical predications (a detailed calculation can be found in the Supplementary Information) 59,60 . The test continues as the humidity sensor moves away from the water surface, for which the measurement results closely follow the readings from the approaching process and show a negligible hysteretic effect overall.…”

Section: Demonstrationssupporting

confidence: 84%

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Zhu

Yang

et al. 2017

Microsyst Nanoeng

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Degradation and delamination resulting from environmental humidity have been technically challenging for poly (3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) thin-film processing. To overcome this problem, we introduced a one-step photolithographic method to both pattern and link a PEDOT:PSS film onto a poly (ethylene glycol) (PEG) layer as a hybrid thin film structure on a flexible substrate. This film exhibited excellent long-term moisture stability (more than 10 days) and lithographic resolution (as low as 2 μm). Mechanical characterizations were performed, including both stretching and bending tests, which illustrated the strong adhesion present between the PEDOT:PSS and PEG layers as well as between the hybrid thin film and substrate. Moreover, the hybrid moisture-absorbable film showed a quick response of its permittivity to environmental humidity variations, in which the patterned PEDOT:PSS layer served as an electrode and the PEG layer as a moisture-sensing element. Perspiration tracking over various parts of the body surface as well as breath rate measurement under the nose were successfully carried out as demonstrations, which illustrated the potential utility of this stable hybrid thin film for emerging flexible and wearable electronic applications.

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Section: Demonstrationssupporting

confidence: 84%

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Zhu

Yang

et al. 2017

Microsyst Nanoeng

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“…Similarly, flexible thin-film transistors with active regions composed of MoS 2 generated from the electrochemical lithiation and exfoliation technique 50 have been demonstrated as sensitive NO 2 gas detectors 122 . Thin-film humidity sensors made from liquid-phase exfoliated VS 2 nanosheets have been incorporated into a sensor array that can detect the moisture from fingers 40 . The conductivity in these sensors is modulated by the presence of water molecules, which inhibit conduction along V atoms at flake edges 40 .…”

Section: Molecular Sensing Applicationsmentioning

confidence: 99%

“…Thin-film humidity sensors made from liquid-phase exfoliated VS 2 nanosheets have been incorporated into a sensor array that can detect the moisture from fingers 40 . The conductivity in these sensors is modulated by the presence of water molecules, which inhibit conduction along V atoms at flake edges 40 . Transistors made from MoS 2 also exhibit humidity-dependent hysteresis in their current-voltage behaviour, probably owing to water molecules easily adsorbing onto the hydrophilic MoS 2 surface and being polarized by the applied gate voltage 162 .…”

Section: Molecular Sensing Applicationsmentioning

confidence: 99%

“…Other layered materials such as BN (refs 1,12,29) and oxide nanosheets 10,38 can also be mechanically exfoliated into single sheets by this method. Mechanical cleavage produces single-crystal flakes of high purity and cleanliness that are suitable for fundamental characterization [30][31][32][33] and for fabrication of individual devices 11,31,32,34,35,[39][40][41] . This method is not scalable, however, and does not allow systematic control of flake thickness and size.…”

mentioning

confidence: 99%

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Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

et al. 2012

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699M any two-dimensional (2D) materials exist in bulk form as stacks of strongly bonded layers with weak interlayer attraction, allowing exfoliation into individual, atomically thin layers 1 . The form receiving the most attention today is graphene, the monolayer counterpart of graphite. The electronic band structure of graphene has a linear dispersion near the K point, and charge carriers can be described as massless Dirac fermions, providing scientists with an abundance of new physics 2,3 . Graphene is a unique example of an extremely thin electrical and thermal conductor 4 , with high carrier mobility 5 , and surprising molecular barrier properties 6,7 .Many other 2D materials are known, such as the TMDCs 8,9 , transition metal oxides including titania-and perovskite-based oxides 10,11 , and graphene analogues such as boron nitride (BN) 12,13 . In particular, TMDCs show a wide range of electronic, optical, mechanical, chemical and thermal properties that have been studied by researchers for decades 9,14,15 . There is at present a resurgence of scientific and engineering interest in TMDCs in their atomically thin 2D forms because of recent advances in sample preparation, optical detection, transfer and manipulation of 2D materials, and physical understanding of 2D materials learned from graphene.The 2D exfoliated versions of TMDCs offer properties that are complementary to yet distinct from those in graphene. Graphene displays an exceptionally high carrier mobility exceeding 10 6 cm 2 V -1 s -1 at 2 K (ref. 16) and exceeding 10 5 cm 2 V -1 s -1 at room temperature for devices encapsulated in BN dielectric layers 5 ; because pristine graphene lacks a bandgap, however, fieldeffect transistors (FETs) made from graphene cannot be effectively switched off and have low on/off switching ratios. Bandgaps can be engineered in graphene using nanostructuring [17][18][19] , chemical functionalization 20 and applying a high electric field to bilayer graphene 21 , but these methods add complexity and diminish mobility. In contrast, several 2D TMDCs possess sizable bandgaps around 1-2 eV (refs 9,14), promising interesting new FET and optoelectronic devices.TMDCs are a class of materials with the formula MX 2 , where M is a transition metal element from group IV (Ti, Zr, Hf and so on), group V (for instance V, Nb or Ta) or group VI (Mo, W and so on), and X is a chalcogen (S, Se or Te). These materials form layered structures of the form X-M-X, with the chalcogen atoms in two hexagonal planes separated by a plane of metal atoms, as shown in Fig. 1a. Adjacent layers are weakly held together to form the bulk crystal in a variety of polytypes, which vary in stacking orders and metal atom coordination, as shown in Fig. 1e. The overall symmetry of TMDCs is hexagonal or rhombohedral, and the metal atoms have octahedral or trigonal prismatic coordination. The electronic properties of TMDCs range from metallic to semiconducting, as summarized in Table 1. There are also TMDCs that exhibit exotic behaviours such as charge density waves ...

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“…But the yield of monolayers through liquid-phase exfoliation is not very high. Free-standing nanosheets of VS 2 [25] and VSe 2 [26] are obtained by refluxing the bulk materials in solvents like formamide.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.

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Giant Moisture Responsiveness of VS₂ Ultrathin Nanosheets for Novel Touchless Positioning Interface

Cited by 390 publications

References 33 publications

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

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Giant Moisture Responsiveness of VS2 Ultrathin Nanosheets for Novel Touchless Positioning Interface

Cited by 390 publications

References 33 publications

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

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Product

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Giant Moisture Responsiveness of VS₂ Ultrathin Nanosheets for Novel Touchless Positioning Interface