In situ nanomechanical characterization of multi-layer MoS<sub>2</sub>membranes: from intraplanar to interplanar fracture

Li, Peifeng; Jiang, Chengpeng; Xu, Shenglong; Zhuang, Yu; Gao, Libo; Hu, Alice; Wang, Hongtao; Lü, Yang

doi:10.1039/c7nr02171b

Cited by 42 publications

(40 citation statements)

References 43 publications

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“…To the best of our knowledge, the corresponding curve for the c direction has not been reported so far. Analogously, we have not found previous strain-stress curves along this direction for bulk 2H-MoS2, whereas for the in-plane directions the previous reported studies refer to single- or few-layer 2H-MoS2 [54,55]. These results indicate a noticeable decreasing of σc as the size of the slab increases, which is also the expected trend according to our calculations.…”

Section: 3c-sic 2h-sic Graphite and 2h-mosbold2: Results And Dissupporting

confidence: 87%

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

et al. 2019

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Understanding the stability limit of crystalline materials under variable tensile stress conditions is of capital interest for technological applications. In this study, we present results from first-principles density functional theory calculations that quantitatively account for the response of selected covalent and layered materials to general stress conditions. In particular, we have evaluated the ideal strength along the main crystallographic directions of 3C and 2H polytypes of SiC, hexagonal ABA stacking of graphite and 2H-MoS2. Transverse superimposed stress on the tensile stress was taken into account in order to evaluate how the critical strength is affected by these multi-load conditions. In general, increasing transverse stress from negative to positive values leads to the expected decreasing of the critical strength. Few exceptions found in the compressive stress region correlate with the trends in the density of bonds along the directions with the unexpected behavior. In addition, we propose a modified spinodal equation of state able to accurately describe the calculated stress–strain curves. This analytical function is of general use and can also be applied to experimental data anticipating critical strengths and strain values, and for providing information on the energy stored in tensile stress processes.

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Section: 3c-sic 2h-sic Graphite and 2h-mosbold2: Results And Dissupporting

confidence: 87%

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

et al. 2019

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show abstract

“…To the best of our knowledge, the corresponding curve for the c direction has not been reported so far. Analogously, we have not found previous strain-stress curves along this direction for bulk 2H-MoS 2 , whereas for the in-plane directions the previous reported studies refer to single-or few-layers 2H-MoS 2 [49,50]. These results indicateg a noticeable decreasing of σ c as the size of the slab increases, which is also the expected trend according to our calculations.…”

Section: Ideal Strength With and Without Transverse Stresssupporting

confidence: 87%

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Chorfi¹,

Lobato²,

Boudjada³

et al. 2019

Preprint

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Understanding the stability limit of crystalline materials under variable tensile stress conditions is of capital interest for their technological applications. In this study, we present results from first-principles density functional theory calculations that quantitatively account for the response of selected covalent and layered materials to general stress conditions. In particular, we have evaluated the ideal strength along the main crystallographic directions of 3C and 2H polytypes of SiC, hexagonal ABA stacking of graphite and 2H-MoS2. Transverse superimposed stress on the tensile stress was taken into account in order to evaluate how the critical strength is affected by these multi-load conditions. In general, increasing transverse stress from negative to positive values leads to the expected decreasing of the critical strength. Few exceptions found in the compressive stress region correlate with the trends in the density of bonds along the directions with the unexpected behavior. In addition, we propose a modified spinodal equation of state able to accurately describe the calculated stress-strain curves. This analytical function is of general use and can also be applied to experimental data anticipating critical strengths and strains values and providing informattion on the energy stored in tensile stress processes.

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“…Moreover, it is impossible to visualize the dynamic fracture processes by performing nanoindentation tests. Recently, several types of micro-/nano-mechanical testing devices have been successfully designed and developed, enabling the uniform in-plane loading on a freestanding membrane of 2D crystals [76,108,[172][173][174][175][176]. As long as selected crystals are transferred onto the testing area, their mechanical properties can be well quantified.…”

Section: Micro-/nano-mechanical Devicesmentioning

confidence: 99%

Mechanical testing of two-dimensional materials: a brief review

Al-Quraishi

Kauppila

et al. 2020

International Journal of Smart and Nano Materials

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Two-dimensional (2D) materials have dominated nanoscience for the last two decades. Among all 2D materials, graphene, MoS 2 , and h-BN are extremely popular and have been tentatively scaled up to fabricate nanocomposites, energy storage devices, flexible electronics, etc., ex situ and in situ mechanical characterization of 2D crystals can help us understand their mechanical behavior and measure their mechanical properties, which are of great significance in both fundamental science and practical engineering. To date, a great effort has been devoted to both theoretical and experimental mechanics with a focus on unveiling mechanical behaviors and quantifying mechanical properties. Beyond original research, several insightful review works have been published with a specific focus on the mechanics of 2D materials. To have a complementary contribution to the overview of the mechanics of 2D materials, we would like to review the developed experimental techniques being used to mechanically characterize 2D materials. The working mechanism and associated advantages and disadvantages of the techniques will be briefly discussed. Based on the existence of arguments in mechanical properties and behaviors of 2D crystals, and immature mechanical characterization of 2D materials, more intensive and comprehensive studies are expected toward a full understanding of these novel and promising materials.

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In situ nanomechanical characterization of multi-layer MoS₂membranes: from intraplanar to interplanar fracture

Cited by 42 publications

References 43 publications

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Mechanical testing of two-dimensional materials: a brief review

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In situ nanomechanical characterization of multi-layer MoS2membranes: from intraplanar to interplanar fracture

Cited by 42 publications

References 43 publications

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Computational Modeling of Tensile Stress Effects on the Structure and Stability of Prototypical Covalent and Layered Materials

Mechanical testing of two-dimensional materials: a brief review

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In situ nanomechanical characterization of multi-layer MoS₂membranes: from intraplanar to interplanar fracture