Investigating the exfoliation behavior of MoS2 and graphite in water: A comparative study

Ma, Han; Ben, Shuang; Shen, Zhigang; Zhang, Xiaojing; Wu, Chunping; Liao, Shasha; An, Fengjiang

doi:10.1016/j.apsusc.2020.145588

Cited by 27 publications

(20 citation statements)

References 54 publications

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“…Note that the lateral sizes of 161, 67, and 10 nm corresponded to the thicknesses of 18.3 (multilayer), 5.1 (few‐layer), and 1.0 nm (1–2 layers), respectively. Evidently, the shifting of both peaks of E 1 2g mode (in‐plane vibrations) and A 1g mode (out‐of‐plane vibrations) [ 33–35 ] could be used as the indicator for the reduction in both lateral sizes and thicknesses of the NSs. The crystalline structures of the MoS 2 NSs were further confirmed by X‐ray diffraction (XRD).…”

Section: Figurementioning

confidence: 99%

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects

Cheng

Sui

Wang

et al. 2020

Adv Materials Inter

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The production of 2D nanosheets (2D NSs) with all sizes (1–100 nm) and few (<10) layers is highly desired but remains great challenge. Herein, the top‐down production of molybdenum disulfide (MoS2) NSs with wide‐range (161–10 nm) controlled sizes is reported. Considering the recently achieved MoS2 quantum sheets (QSs) with sizes of ≈2 nm, full‐scale NSs of MoS2 are successfully produced. The top‐down method combines silica‐assisted ball‐milling and sonication‐assisted solvent exfoliation. Ball‐milling with controlled time enables the production of multiscale NSs with varying distributions, which are then precisely separated by cascade centrifugation. Multiple spectroscopic techniques reveal the dramatic size dependence, indicating prominent quantum confinement and edge effects of the MoS2 NSs. The NSs‐poly(methyl methacrylate) (PMMA) hybrid thin films demonstrate strong size effects in nonlinear saturation absorption (NSA). Both (absolute) modulation depths and saturation intensities can be broadly modulated by simple variation of the NS sizes. With the sizes down from 161 to 10 nm, the modulation depths are increased from 27.0% to 51.3% and the saturation intensities are decreased from 33 419 to 21.2 kW cm−2 (3341.9–2.12 nJ cm−2). The work greatly facilitates the mass production and full exploration of 2D NSs with all sizes.

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Section: Figurementioning

confidence: 99%

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects

Cheng

Sui

Wang

et al. 2020

Adv Materials Inter

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“…Since the discovery of graphene in 2004 1 , two-dimensional (2D) materials have become one of the research focuses in the fields of physics, chemistry, and material science 2 – 6 . Recently, molybdenum disulfide (MoS 2 ), as a prototypical example of transition metal dichalcogenide (TMDs), has attracted considerable interest from scientists due to its unique properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical characterization of nanoporous two-dimensional MoS2 membranes

Pham

Fang

2022

Sci Rep

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For practical application, determining the thermal and mechanical characterization of nanoporous two-dimensional MoS2 membranes is critical. To understand the influences of the temperature and porosity on the mechanical properties of single-layer MoS2 membrane, uniaxial and biaxial tensions were conducted using molecular dynamics simulations. It was found that Young’s modulus, ultimate strength, and fracture strain reduce with the temperature increases. At the same time, porosity effects were found to cause a decrease in the ultimate strength, fracture strain, and Young’s modulus of MoS2 membranes. Because the pore exists, the most considerable stresses will be concentrated around the pore site throughout uniaxial and biaxial tensile tests, increasing the possibility of fracture compared to tensing the pristine membrane. Moreover, this article investigates the impacts of temperature, porosity, and length size on the thermal conductivity of MoS2 membrane using the non-equilibrium molecular dynamics (NEMD) method. The results show that the thermal conductivity of the MoS2 membrane is strongly dependent on the temperature, porosity, and length size. Specifically, the thermal conductivity decreases as the temperature increases, and the thermal conductivity reduces as the porosity density increases. Interestingly, the thermal and mechanical properties of the pristine MoS2 membrane are similar in armchair and zigzag directions.

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“…[147][148][149][150] It can not only reduce the vertical thickness of materials down to the monolayer level, but also shrink the lateral particle size. 151 There are several mechanisms, such as one intercalation exfoliation is to insert intercalation ions into TMD interlayers that can expand the layer distance and separate individual layers. Another sonication-assisted exfoliation is to break the vdW bonds between TMD interlayers using ultrasonic energy.…”

Section: Liquid Exfoliationmentioning

confidence: 99%

Flexible electronics based on 2D transition metal dichalcogenides

et al. 2022

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Investigating the exfoliation behavior of MoS2 and graphite in water: A comparative study

Cited by 27 publications

References 54 publications

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects

Thermal and mechanical characterization of nanoporous two-dimensional MoS2 membranes

Flexible electronics based on 2D transition metal dichalcogenides

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Investigating the exfoliation behavior of MoS2 and graphite in water: A comparative study

Cited by 27 publications

References 54 publications

Controlled Production of MoS2 Full‐Scale Nanosheets and Their Strong Size Effects

Controlled Production of MoS2 Full‐Scale Nanosheets and Their Strong Size Effects

Thermal and mechanical characterization of nanoporous two-dimensional MoS2 membranes

Flexible electronics based on 2D transition metal dichalcogenides

Contact Info

Product

Resources

About

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects

Controlled Production of MoS₂ Full‐Scale Nanosheets and Their Strong Size Effects