Inverse Pseudo Hall-Petch Relation in Polycrystalline Graphene

Zhang, Sha; Quek, Siu Sin; Pei, Qing‐Xiang; Liu, Zishun; Wang, T. J.; Shenoy, Vivek B.; Zhang, Yong‐Wei

doi:10.1038/srep05991

Cited by 83 publications

(85 citation statements)

References 39 publications

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“…b Pseudo Hall-Petch strength reduction in polycrystalline graphene (Song et al 2013a). c Inverse pseudo Hall-Petch relation in polycrystalline graphene (Sha et al 2014b). Reprinted from Kotakoski and Meyer (2012) and Song et al (2013a) with permission grains, but the strength increases as the grain size is reduced, similar to the classical Hall-Patch relation in polycrystalline metals.…”

Section: Theoretical Strength Of Graphenementioning

confidence: 80%

“…Considerable attention has been attracted to possible grain size effect on the strength of polycrystalline graphene (Kotakoski and Meyer 2012;Song et al 2013a;Sha et al 2014b;Yang et al 2015b). Figure 7 shows that there exist apparent discrepancies or controversies in the observed grain size dependent strength of polycrystalline graphene in the literature.…”

Section: Theoretical Strength Of Graphenementioning

confidence: 99%

“…It was argued that the strength decrease in the larger grain size sample can be attributed to the higher pre-stress occurred at the triple junction. However, Sha et al (2014b) performed MD simulations for the strength of polycrystalline graphene samples generated from a random Voronoi construction. In this study, grain boundary junctions were also identified as weak spots for crack initiation, but the strength was found to decrease as the grain size is reduced, corresponding to an inverse Hall-Patch relationship.…”

Section: Theoretical Strength Of Graphenementioning

confidence: 99%

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Fracture of graphene: a review

2015

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Fracture is one of the most prominent concerns for large scale applications of graphene. In this paper, we review some of the recent progresses in experimental and theoretical studies on the fracture behaviors of graphene, with discussions touching theoretical strength, mode I fracture toughness, mixed mode fracture, chemical fracture, irradiation fracture, dynamic fracture, impact fracture, and sonication fracture. In spite of rapid developments in experiments and simulations, there are still significant yet unresolved issues related to the fracture of graphene, examples including: (1) Can one enhance the toughness of graphene with designed topological defects? (2) How does grain size affect the strength of polycrystalline graphene? (3) How do the out-of-plane effects (e.g., wrinkle caused by external loading or curvature induced by topological defects) influence the fracture of graphene? (4) Can one develop a continuum model with the ability to capture graphene fracture with complicated modes, such as shear fracture coupled with wrinkling deformation and tear fracture? (5) How does fracture occur when tearing a polycrystalline graphene sheet? (6) Can one control the fracture behavior of graphene by combing the chemical, irradiation and stress effect? (7) How fast can cracks propagate in graphene? (8) What is the behavior of interfacial cracks in graphene, i.e., cracks along the grain boundaries or interfaces of heterogeneous structures? (9) How does a multilayer graphene membrane break under high speed impact and why such structures can absorb a large amount of kinetic energy? (10) Can one tailor/design the graphene structures with controlled fracture? The intention here is not to provide complete answers to such questions, but to draw attention from the mechanics community to them as potential research topics.

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Section: Theoretical Strength Of Graphenementioning

confidence: 80%

Section: Theoretical Strength Of Graphenementioning

confidence: 99%

Section: Theoretical Strength Of Graphenementioning

confidence: 99%

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Fracture of graphene: a review

2015

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“…However, those findings are in contrast to theory taking into account more natural GB geometries. Such simulations typically result in lower values for E 3D [90][91][92][93][94][95]. In particular, Kotakoski and Meyer [90], who performed large-scale MD simulations on polycrystalline graphene, found significantly lower values of the Young's modulus E 600 GPa…”

Section: Dmentioning

confidence: 99%

“…The dependence of fracture strength on grain size for the studies in [91][92][93]95] are shown in figure 5. Notably, three studies [92,93,95] report increasing strength with increasing grain size, while Song et al [91] find the opposite trend. The fracture strengths in the study by Kotakoski and Meyer [90] and the paper of Yang et al [94], however, showed no significant dependence on grain size.…”

Section: Fracture Strengthmentioning

confidence: 99%

Scaling properties of polycrystalline graphene: a review

et al. 2016

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We present an overview of the electrical, mechanical, and thermal properties of polycrystalline graphene. Most global properties of this material, such as the charge mobility, thermal conductivity, or Young's modulus, are sensitive to its microstructure, for instance the grain size and the presence of line or point defects. Both the local and global features of polycrystalline graphene have been investigated by a variety of simulations and experimental measurements. In this review, we summarize the properties of polycrystalline graphene, and by establishing a perspective on how the microstructure impacts its large-scale physical properties, we aim to provide guidance for further optimization and improvement of applications based on this material, such as flexible and wearable electronics, and high-frequency or spintronic devices.

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Topological Design of Graphene

Zhang

et al. 2019

Handbook of Graphene

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Topological defects (e.g. pentagons, heptagons and pentagon-heptagon pairs) have been widely observed in large scale graphene and have been recognized to play important roles in tailoring the mechanical and physical properties of two-dimensional materials in general. Thanks to intensive studies over the past few years, optimizing properties of graphene through topological design has become a new and promising direction of research. In this chapter, we review some of the recent advances in experimental, computational and theoretical studies on the effects of topological defects on mechanical and physical properties of graphene and applications of topologically designed graphene. The discussions cover out-of-plane effects, inverse problems of designing distributions of topological defects that make a graphene sheet conform to a targeted three-dimensional surface, grain boundary engineering for graphene strength, curved graphene for toughness enhancement and applications in engineering energy materials, multifunctional materials and interactions with biological systems. Despite the rapid developments in experiments and simulations, our understanding on the relations between topological defects and mechanical and physical properties of graphene and other 2D materials is still in its infancy.The intention here is to draw the attention of the research community to some of the open questions in this field.

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Inverse Pseudo Hall-Petch Relation in Polycrystalline Graphene

Cited by 83 publications

References 39 publications

Fracture of graphene: a review

Fracture of graphene: a review

Scaling properties of polycrystalline graphene: a review

Topological Design of Graphene

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