The speed-locking effect of particles on a graphene layer with travelling surface wave

Wang, Dan; Wang, Lifeng; Hu, Zhili

doi:10.1186/s11671-020-03434-6

Cited by 7 publications

(8 citation statements)

References 46 publications

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“…Note that E e is a function of A and h . Eq can be further written as , U i = − 2 ρ ε̃ π σ̃ 6 d 4 + 4 ρ ε̃ π σ̃ 12 5 d 10 , where d is the distributed distance between graphene and the substrate surface, and ρ is the surface atom density of the substrate. Then, E surf = ∑ i U i = ρ∫ S U i dS .…”

Section: Methodsmentioning

confidence: 99%

Growth Instability of 2D Materials on Non-Euclidean Surfaces

Xue

Zhang

et al. 2023

ACS Nano

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Chemical growth of two-dimensional (2D) materials with controlled morphology is critical to bring their tantalizing properties to fruition. However, the growth must be on a substrate, which involves either intrinsic or intentionally introduced undulation, at a scale significantly larger than the materials thickness. Recent theory and experiments showed that 2D materials grown on a curved feature on substrates can incur a variety of topological defects and grain boundaries. Using a Monte Carlo method, we herein show that 2D materials growing on periodically undulated substrates with nonzero Gaussian curvature of practical relevance follow three distinct modes: defect-free conformal, defect-free suspension and defective conformal modes. The growth on the non-Euclidean surface can accumulate tensile stress that gradually lifts the materials from substrates and progressively turns the conformal mode into a suspension mode with increasing the undulation amplitude. Further enhancing the undulation can trigger Asaro–Tiller–Grinfield growth instability in the materials, manifested as discretely distributed topological defects due to strong stress concentration. We rationalize these results by model analyses and establish a “phase” diagram for guiding the control of growth morphology via substrate patterning. The undulation-induced suspension of 2D materials can help understand the formation of overlapping grain boundaries, spotted quite often in experiments, and guide how to avoid them.

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Section: Methodsmentioning

confidence: 99%

Growth Instability of 2D Materials on Non-Euclidean Surfaces

Xue

Zhang

et al. 2023

ACS Nano

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“…36,37 It is noted that this is a simplified model as the values of atomic number density on each layer are approximated by a van der Waals equilibrium radius. 38,39 This simplification is acceptable as the interaction is dominated by the surface potential well. Besides, the numbers of CCl 4 molecules may be different for real systems, the interaction distribution trend is similar for the simplified case.…”

Section: Theoretical Modelingmentioning

confidence: 99%

“…† 36,37 It is noted that this is a simplified model as the values of atomic number density on each layer are approximated by a van der Waals equilibrium radius. 38,39 This simplification is acceptable as the interaction is dominated by the surface potential well.…”

Section: Theoretical Modelingmentioning

confidence: 99%

Orientation order of a nonpolar molecular fluid compressed into a nanosmall space

et al. 2023

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“…The drop interacts stronger with surface of h-BN sheet and moves faster over it. In the work [11] it is shown, that fast dynamics of particles on a flat surface can be related to the fact, that the particle can move over graphene layer synchronously with the running bending surface wave, constantly remaining in this wave pit.…”

Section: Introductionmentioning

confidence: 99%

Thermophoresis of carbon nanoparticles (nanoribbons and nanotubes) on a flat multilayer substrate of hexagonal boron nitride (h-BN)

Savin

2022

Physics of the Solid State

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Using the method of molecular dynamics and a 2D chain model, it is shown that thermophoresis of carbon nanoparticles (nanoribbons and nanotubes) on a flat multilayer substrate (on a flat surface of a hexagonal boron nitride crystal) has high efficiency. Placing a nanoparticle on a flat surface of a substrate involved in heat transfer leads to its movement in the direction of the heat flow. The heat flow along the substrate leads to the formation of constant forces acting on the nanoparticle nodes (thermophoresis forces). The main effect of the force is exerted on the edges of graphene nanoribbons, exactly where the main interaction of the nanoribbon with the bending phonons of the substrate occurs. These phonons have a long free path, so the effective transfer of nanoparticles using thermophoresis can occur at sufficiently large distances. The motion of carbon nanoparticles under the action of a heat flow has the form of particle motion in a viscous medium under the action of a constant force. Over time, the nanoparticles always enter the mode of movement at a constant speed. The velocity of the stationary motion is almost the same for all sizes and types of carbon nanoparticles, which is explained by the fact that the thermophoresis force and effective friction have the same source --- the interaction of the nanoparticle with the bending thermal vibrations of the substrate layers. Keywords: nanoribbons, nanotubes, flat multilayer substrates, thermophoresis, 2D model of the multilayer substrate.

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The speed-locking effect of particles on a graphene layer with travelling surface wave

Cited by 7 publications

References 46 publications

Growth Instability of 2D Materials on Non-Euclidean Surfaces

Growth Instability of 2D Materials on Non-Euclidean Surfaces

Orientation order of a nonpolar molecular fluid compressed into a nanosmall space

Thermophoresis of carbon nanoparticles (nanoribbons and nanotubes) on a flat multilayer substrate of hexagonal boron nitride (h-BN)

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