Electrical transport properties of individual WS2 nanotubes and their dependence on water and oxygen absorption

Zhang, Chaoying; Ning, Zhiyuan; Liu, Yang; Xu, Tingting; Zak, Alla; Zhang, Zhiyong; Wang, Sheng; Tenne, Reshef; Chen, Qing

doi:10.1063/1.4752440

Cited by 43 publications

(42 citation statements)

References 30 publications

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“…1-5 High energy and power densities are of great essential to LIBs for applications in electric vehicles, stationary energy storage systems for solar and wind energy as well as smart grid. [12][13][14][15] Among TMDs, two dimensional (2D) nanoscale metal disulfides, such as MoS 2 and WS 2 , have been intensively studied to examine their properties, including electrical transport, [16][17][18][19] luminescence, [20][21][22] photocurrent and catalytic properties, [23][24][25] as well as their strain effects. [9][10][11] Very recently, the layer structured transition metal dischalcogenides (TMDs) with strong in-plane covalent bonds and weak out-of-plane van der Waals forces have attracted significant attention due to their immense potentials for various applications.…”

Section: Introductionmentioning

confidence: 99%

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

Yang

Wang

et al. 2015

J. Mater. Chem. A

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Rechargeable lithium ion batteries (LIBs) have transformed portableelectronics and will play a crucial role in transportation like electric vehicles. For higher energy storage in LIBs, two issues should be addressed, that is, fundamental understanding of the chemistry taking place in LIBs and discovery of new materials. Here we design and fabricate two-dimensional (2D) WS 2 nanosheets with preferential orientation of [001] and perfect single crystalline structures. Being used as an anode for LIBs, the WS 2 -nanosheet electrode exhibits high specific capacity, good cycling performance and excellent rate capability. Considering the controversy in the lithium storage mechanism of WS 2 , ex-situ X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS) analyses clearly verify that the recharge product (3.0 V vs. Li + /Li) of the WS 2 electrode after fully discharging to 0.01 V (vs. Li + /Li) tends to reverse to 4 As is known, nanomaterials have the genuine potential to make a significant impact on the performance of LIBs, as their reduced dimensions enable high intercalation/deintercalation rates. The physical and chemical properties of nanostructured materials depend crucially on their morphologies and sizes. Therefore, nanomaterials have been widely explored to improve the electrochemical performance of LIBs, including 0D quantum dots, 40 1D nanoribbons, 41 2D nanosheets, 39 and 3D nanomaterials. 42 Herein, we fabricate the [001] preferentially-oriented 2D WS 2 nanosheets with perfect single crystal structures. As the anode for LIBs, the WS 2 -nanosheet electrode achieves a stable reversible capacity of about 539.1 mA h g -1 after 60 cycles at a current density of 0.2 A g -1 and a high rate capability.Considering the controversy in the lithium storage mechanism of WS 2 , ex-situ XRD, Raman and XPS analyses verify that the recharge product (3.0 V vs. Li + /Li) of the WS 2 electrode after fully discharging to 0.01 V (vs. Li + /Li) tends to reverse to WS 2 .More importantly, the [001] preferentially-oriented 2D WS 2 nanosheets with perfect single crystal structures could have immense potentials in other fields, for example, photocatalysis and hydrogen evolution reactions. 25,43 Experimental section Fabrication of preferentially-oriented 2D WS 2 nanosheetsThe [001] preferentially-oriented 2D WS 2 nanosheets were fabricated by calcination of metallic W and S powders. The mixture of W and S powders (purity: 99.9 wt. %) with the atomic ratio of 1:2.1 was sealed in a vacuum quartz tube, and Figure 2. (a, b) Low-magnification TEM images, (c) SAED pattern, and (d, e) HRTEM images of the WS 2 samples. (f) Schematic illustration of plane (002) of WS 2 .Inset of (d) shows the FFT pattern corresponding to the HRTEM image. (g) STEM image of the WS 2 nanosheets, and (h, i) NB-EDX spectra corresponding to the marked areas by square 1 and 2 in (g) respectively.

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Section: Introductionmentioning

confidence: 99%

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

Yang

Wang

et al. 2015

J. Mater. Chem. A

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“…Similar to graphene2, layered transition-metal dichalcogenides (TMDs), MX 2 (M = Mo, W, Ta, or Nb, and X = S, Se, or Te) are considered as promising electronic and optoelectronic materials567891011 and have been synthesized1213141516. MoS 2 , an important delegate of TMDs, arouses researchers' keen interest in recent years1516171819.…”

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confidence: 99%

Theoretical Prediction of Electronic Structure and Carrier Mobility in Single-walled MoS2 Nanotubes

Xiao

Long

et al. 2014

Sci Rep

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We have investigated the electronic structure and carrier mobility of armchair and zigzag single-walled MoS2 nanotubes using density functional theory combined with Boltzmann transport method with relaxation time approximation. It is shown that armchair nanotubes are indirect bandgap semiconductors, while zigzag nanotubes are direct ones. The band gaps of single-walled MoS2 nanotubes are along with the augment of their diameters. For armchair nanotubes (5 ≤ Na ≤ 14), the hole mobility raise from 98.62 ~ 740.93 cm2V−1s−1 at room temperature, which is about six times of the electron mobility. For zigzag nanotubes (9 ≤ Na ≤ 15), the hole mobility is 56.61 ~ 91.32 cm2V−1s−1 at room temperature, which is about half of the electron mobility.

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“…The I-V characteristic of the device presented in Fig. 3(b) demonstrate that the electrical behavior is similar to that of a two probe WS 2 nanotube device [41] with metal contacts. We also fabricated similar hybrid devices using exfoliated MoS 2 and WS 2 nanotubes to explore photocarrier diffusion [22] at the TMDC junction.…”

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confidence: 65%

Light matter interaction in WS₂ nanotube-graphene hybrid devices

et al. 2014

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We study the light matter interaction in WS2 nanotube-graphene hybrid devices. Using scanning photocurrent microscopy we find that by engineering graphene electrodes for WS2 nanotubes we can improve the collection of photogenerated carriers. We observe inhomogeneous spatial photocurrent response with an external quantum efficiency of ∼1% at 0 V bias. We show that defects play an important role and can be utilized to enhance and tune photocarrier generation.Heterostructure devices of transition metal dichalcogenides (TMDCs) and graphene have generated considerable research interest recently because of their superior optical and electronic properties.[1, 2] The semiconducting nature of TMDCs combined with the presence of van Hove singularities in their electronic density of states allows for efficient photon absorption and carrier generation under optical excitation.[3] Combining this feature with the high mobility of graphene has led to optoelectronic studies of heterostructure devices comprising graphene and single layer TMDCs. [1,[3][4][5][6][7] These devices have exhibited good quantum efficiency for photocurrent generation in the visible range. However, the fabrication of such heterostructures requires multiple exfoliation and transfer steps. TMDC nanotubes[8] represent another alternative for such applications; nanowires offer an additional advantage because they can enhance the absorption of light through the formation of optical cavities[9, 10] and quasi 1D structures are known to enhance light matter interaction by virtue of an enhanced joint density of states (JDOS).[11] Silicon and carbon nanotubes have been shown to be promising materials for solar-cell applications. [12,13] Similarly, TMDC nanotubes could also allow for large scale integration of on-chip optoelectronic elements. In addition, the curvature of the nanotubes can be used to engineer spin and valley based optoelectronic control in dichalcogenide systems.[14] Here, we investigate the photoresponse of WS 2 nanotubes with field-effect transistor geometry and the enhanced photoresponse properties of hybrid devices of WS 2 nanotubes with graphene electrodes. One of the motivations for using graphene electrodes for the nanotube is to modulate the density of carriers in the electrodes and modify the Schottky barrier;[15] the other motivation is to observe the spatial homogeneity of the photoresponse. We investigate the efficiency of these devices for photoconversion and attempt to understand the role of defects in modifying optoelectronic properties. [16] Prior to studying the hybrid devices, we probe individual WS 2 nanotubes and show that they offer a good optoelectronic platform. [17,18] We used WS 2 multiwalled * deshmukh@tifr.res.in

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Electrical transport properties of individual WS2 nanotubes and their dependence on water and oxygen absorption

Cited by 43 publications

References 30 publications

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

Theoretical Prediction of Electronic Structure and Carrier Mobility in Single-walled MoS2 Nanotubes

Light matter interaction in WS₂ nanotube-graphene hybrid devices

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Electrical transport properties of individual WS2 nanotubes and their dependence on water and oxygen absorption

Cited by 43 publications

References 30 publications

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

[001] preferentially-oriented 2D tungsten disulfide nanosheets as anode materials for superior lithium storage

Theoretical Prediction of Electronic Structure and Carrier Mobility in Single-walled MoS2 Nanotubes

Light matter interaction in WS2 nanotube-graphene hybrid devices

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Product

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Light matter interaction in WS₂ nanotube-graphene hybrid devices