Origin of frictional scaling law in circular twist layered interfaces: Simulations and theory

Yan, Weidong; Ouyang, Wengen; Liu, Ze

doi:10.1016/j.jmps.2022.105114

Cited by 11 publications

(13 citation statements)

References 55 publications

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“…interlayer sliding process, for example, the 'W ' shaped moiré boundary can transform into the 'Z' shape during sliding, and the energy barrier is predominantly contributed by the edge atoms determined by the moiré boundary (Figure 4G). [77] It is noteworthy that a recent study shows that the friction scaling significantly depends on the slider shape. [110] For sliders of polygons, the maximum static friction between twisted interface exhibits a unique dualperiod oscillation behavior, as well as size-independent scaling (F A s max 0…”

Section: Frictional Scaling Behavior Of Twisted Vdw Layered Materials...mentioning

confidence: 99%

“…Considering that moiré superlattices have a significant effect on the mechanical and physical properties of vdW layered materials, incorporating the moiré effect into continuum modeling is highly desired. Based on the observed one-to-one correspondence between the atomic potential energy distribution and the moiré superlattice configuration (Figure 4H), [77,110] the moiré superlattice-modulated interlayer potential energy can be approximated by (under the rigid assumption), [46,77,[117][118][119]…”

Section: Analytical Frictional Scaling Laws For Vdw Layered Materialsmentioning

confidence: 99%

“…(blue line in Figure 4C), where w is determined by the shape of the slider and the twist angle. [110] Similarly, when the slider is circular, the relationship between the sliding friction force (F ) and the twist angle (θ) and size (R) can be derived as, [77,120]…”

Section: Analytical Frictional Scaling Laws For Vdw Layered Materialsmentioning

confidence: 99%

“…Conversely, at large twist angles, the shapes of these regions remain essentially unchanged (Figure 2M,N). [74,77] In some cases, the small twist angle can even result in the formation of a helical structure with broken symmetry (Figure 2E-G). [70,72,75,78] Simultaneously, the in-plane atomic reconstruction significantly affects the distribution of the out-of-plane deformation field (Figure 2H-J).…”

Section: Introductionmentioning

confidence: 99%

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Moiré superlattice effects on interfacial mechanical behavior: A concise review

Yan,

Liu,

Ouyang

et al. 2024

Interdisciplinary Materials

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The moiré superlattice, arising from the interface of mismatched single crystals, intricately regulates the physical and mechanical properties of materials, giving rise to phenomena such as superconductivity and superlubricity. This study delves into the profound impact of moiré superlattices on the interfacial mechanical behavior of van der Waals (vdW) layered materials, with a particular focus on tribological properties. A comprehensive review of continuum modeling approaches for vdW layered materials is presented, accentuating the incorporation of moiré superlattice effects in theoretical models to unravel their distinctive interfacial frictional behavior and thermodynamic properties. The exploration of moiré superlattices has significantly advanced our fundamental understanding of interface phenomena in vdW layered materials. This progress provides crucial theoretical insights that can inform the design of multifunctional devices based on the unique properties of twisted layered materials.

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Section: Frictional Scaling Behavior Of Twisted Vdw Layered Materials...mentioning

confidence: 99%

Section: Analytical Frictional Scaling Laws For Vdw Layered Materialsmentioning

confidence: 99%

Section: Analytical Frictional Scaling Laws For Vdw Layered Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Moiré superlattice effects on interfacial mechanical behavior: A concise review

Yan,

Liu,

Ouyang

et al. 2024

Interdisciplinary Materials

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“…The edge effect in the twisting dynamics of the system considered is assessed in Supplementary Note 8. We parametrize a rigid model that efficiently describes the effect of unsaturated Moiré at the edges − and study the relative importance of elasticity and edge contributions to the rotational energy landscape as a function of the flake size. Our analysis shows that while the edge effect is dominant at smaller sizes, the elastic contribution to the rotational energy landscape is dominant at the experimental size, supporting the analysis based on the elasticity reported here; see Supplementary Note 8 for details.…”

Section: Introductionmentioning

confidence: 99%

Twisting Dynamics of Large Lattice-Mismatch van der Waals Heterostructures

Liao

Silva

et al. 2023

ACS Appl. Mater. Interfaces

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van der Waals (vdW) homo/heterostructures are ideal systems for studying interfacial tribological properties such as structural superlubricity. Previous studies concentrated on the mechanism of translational motion in vdW interfaces. However, detailed mechanisms and general properties of the rotational motion are barely explored. Here, we combine experiments and simulations to reveal the twisting dynamics of the MoS2/graphite heterostructure. Unlike the translational friction falling into the superlubricity regime with no twist angle dependence, the dynamic rotational resistances highly depend on twist angles. Our results show that the periodic rotational resistance force originates from structural potential energy changes during the twisting. The structural potential energy of MoS2/graphite heterostructure increases monotonically from 0° to 30° twist angles, and the estimated relative energy barrier is (1.43 ± 0.36) × 10–3 J/m2. The formation of Moiré superstructures in the graphene layer is the key to controlling the structural potential energy of the MoS2/graphene heterostructure. Our results suggest that in twisting 2D heterostructures, even if the interface sliding friction is negligible, the evolving potential energy change results in a nonvanishing rotational resistance force. The structural change of the heterostructure can be an additional pathway for energy dissipation in the rotational motion, further enhancing the rotational friction force.

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In Situ Twistronics: A New Platform Based on Superlubricity

Liu,

Yang,

Fang

et al. 2023

Advanced Materials

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Twistronics, an emerging field focused on exploring the unique electrical properties induced by twist interface in graphene multilayers, has garnered significant attention in recent years. The general manipulation of twist angle depends on the assembly of van der Waals (vdW) layered materials, which has led to the discovery of unconventional superconductivity, ferroelectricity, and nonlinear optics, thereby expanding the realm of twistronics. Recently, in situ tuning of interlayer conductivity in vdW layered materials has been achieved based on scanning probe microscope. In this Perspective, the advancements in in situ twistronics are focused on by reviewing the state‐of‐the‐art in situ manipulating technology, discussing the underlying mechanism based on the concept of structural superlubricity, and exploiting the real‐time twistronic tests under scanning electron microscope (SEM). It is shown that the real‐time manipulation under SEM allows for visualizing and monitoring the interface status during in situ twistronic testing. By harnessing the unique tribological properties of vdW layered materials, this novel platform not only enhances the fabrication of twistronic devices but also facilitates the fundamental understanding of interface phenomena in vdW layered materials. Moreover, this platform holds great promise for the application of twistronic‐mechanical systems, providing avenues for the integration of twistronics into various mechanical frameworks.

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Origin of frictional scaling law in circular twist layered interfaces: Simulations and theory

Cited by 11 publications

References 55 publications

Moiré superlattice effects on interfacial mechanical behavior: A concise review

Moiré superlattice effects on interfacial mechanical behavior: A concise review

Twisting Dynamics of Large Lattice-Mismatch van der Waals Heterostructures

In Situ Twistronics: A New Platform Based on Superlubricity

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