Mechanical Properties of Molybdenum Disulfide and the Effect of Doping: An in Situ TEM Study

Tedstone, Aleksander A.; Lewis, David J.; Hao, Rui; Mao, Shimin; Bellon, Pascal; Averback, Robert S; Warrens, Christopher P.; West, Kevin R.; Howard, Philip; Gaemers, Sander; Dillon, Shen J.; O’Brien, Paul

doi:10.1021/acsami.5b06055

Cited by 51 publications

(45 citation statements)

References 19 publications

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“…For six of the microbeams, deflection until fracture was achieved which ultimately demonstrated brittle failure of the MoS2 coating. The resulting rupture strength provides a comparable value to the MoS2 yield stress measured during nano-compression tests reported as 821 ± 141 MPa [64].…”

Section: Rupture Strength and Fracturesupporting

confidence: 60%

Strength measurement and rupture mechanisms of a micron thick nanocrystalline MoS2 coating using AFM based micro-bending tests

Colas

Serles

Saulot

et al. 2019

Journal of the Mechanics and Physics of Solids

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To cite this version:Guillaume Colas, Peter Serles, Aurélien Saulot, Tobin Filleter. Strength measurement and rupture mechanisms of a micron thick nanocrystalline MoS2 coating using AFM based micro-bending tests. AbstractThe present study focuses on the measurement of mechanical properties of a 1.1 µm thick nanocrystalline MoS2 coating deposited by magnetron sputtering with a particular interest in the strength of the coating. Mechanical strength is one of the most important properties to best predict failure of the coating, especially in the case of dry contact lubricated systems in which the coating of interest is often used. An Atomic Force Microscope based micro-bending experiment was developed to measure the rupture strength of MoS2 micro cantilever-beams directly milled in the coating using a Focused Ion Beam. Rupture strength of the MoS2 coatings was measured to be 728 ± 88 MPa. Comparisons with nanoindentation was used to validate the micro-bending technique via the statistically indifferent measurement of the Young's modulus: 63.1 ± 5.0 GPa and 64.5 ± 4.0 GPa respectively. In depth study of the fractured beam surface and the microstructure of the coating revealed that the surface roughness and the crystallite size can be directly correlated to the rupture pattern. The crack was additionally shown to propagate within the nanocrystalline network existing in the coating. Parallels with the tribological behaviour of the coating are drawn and further confirm the lubrication mechanism described in previous studies. Keyword:MoS2, rupture strength, AFM bending test, focused ion beam, micro cantilever-beam

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Section: Rupture Strength and Fracturesupporting

confidence: 60%

Strength measurement and rupture mechanisms of a micron thick nanocrystalline MoS2 coating using AFM based micro-bending tests

Colas

Serles

Saulot

et al. 2019

Journal of the Mechanics and Physics of Solids

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“…In addition to synthetic developments, these are well studied to explore their physical/chemical properties. Notably the mechanical properties, field‐emission sources, hydrogen storage, catalysis, etc. are thoroughly investigated.…”

Section: Overview Of Mos2 Physical Propertiesmentioning

confidence: 99%

“…are thoroughly investigated. Electronic doping was also carried out to modify their properties . The typical high‐resolution TEM images of MoS 2 nanotubes are shown in Figure e; certain features like molecular layers, stacking faults, and atomically rough surfaces are clearly observed …”

Section: Overview Of Mos2 Physical Propertiesmentioning

confidence: 99%

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Naik

Rabinal

2020

Energy Tech

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Molybdenum disulphide (MoS2), an ideal semiconductor, belongs to the group of 40 well‐identified transition metal dichalcogenides. These have unique chemical bonding; in an ideal case they do not feature dangling bonds and hence possess a layered‐like atomic structure, such that strong intraplane and weak interplane bondings exist. Hence, MoS2 can be peeled into a precisely controlled number of layers; the bulk with Eg = 1.2 eV can be reduced to a unit cell‐thick layer (monolayer) with Eg = 1.89 eV. However, in reality, both bulk and monolayers possess many types of atomic defects associated with in‐plane, edge, grain boundaries, etc. As a result, MoS2 exhibits many interesting and tunable optoelectronic properties suitable for a wide range of applications. Interestingly, its basic polyhedral form (MoS6) undergoes a structural change that leads to many polymorphic phases, the three in bulk and the five in monolayer. Theoretical predictions and experimental observations clearly confirm that MoS2 and its interfaces with other materials can be significantly important for energy conversion and storage applications, which are emerging and critically important topics of modern science and society. This Review provides an overview of the past few years of research and developments on these topics.

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“…38,39 Despite these remarkable advances, the composition-property relationship has long been overlooked. For example, twodimensional materials with a highly symmetric crystalline structure, such as graphene, 40 silicene, 41 and molybdenum disulde, 42 exhibit isotropic mechanical properties while other materials with less symmetric structures, such as phosphorene, 43 are highly anisotropic along in-plane directions. The intrinsic mechanical anisotropy has potential to promote the tunability of mechanical properties of the associated metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Mechanical anisotropy of two-dimensional metamaterials: a computational study

et al. 2019

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Mechanical Properties of Molybdenum Disulfide and the Effect of Doping: An in Situ TEM Study

Cited by 51 publications

References 19 publications

Strength measurement and rupture mechanisms of a micron thick nanocrystalline MoS2 coating using AFM based micro-bending tests

Strength measurement and rupture mechanisms of a micron thick nanocrystalline MoS2 coating using AFM based micro-bending tests

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Mechanical anisotropy of two-dimensional metamaterials: a computational study

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