Extremely compliant and highly stretchable patterned graphene

Zhu, Songming; Huang, Yinjun; Li, Teng

doi:10.1063/1.4874337

Cited by 45 publications

(42 citation statements)

References 51 publications

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“…Feng et al (2012) reviewed and discussed the potential applications of tuning the physical and mechanical properties of graphene with cutting, bending and folding. Using coarse-grained MD simulations, Zhu et al (2014) showed that the large area graphene nano-mesh can exhibit extremely compliant deformation at small strain and high stretchability. Cho et al (2014) demonstrated that it is possible to design structures with complicated shapes by a fractal cut method (Fig.…”

Section: Engineering Graphene Structures With Controlled Fracturementioning

confidence: 99%

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: Engineering Graphene Structures With Controlled Fracturementioning

confidence: 99%

Fracture of graphene: a review

2015

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“…we adopt a scalable bottom-up CG simulation scheme [18], which is recapped below. The energy expression for the above CG scheme includes bonded energy terms and nonbonded energy terms.…”

Section: Simulation Model Setupmentioning

confidence: 99%

Pseudomagnetic fields in a locally strained graphene drumhead

et al. 2014

Self Cite

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Abstract:Recent experiments reveal that a scanning tunneling microscopy (STM) probe tip can generate a highly localized strain field in a graphene drumhead, which in turn leads to pseudomagnetic fields in the graphene that can spatially confine graphene charge carriers in a way similar to a lithographically defined quantum dot (QD). While these experimental findings are intriguing, their further implementation in nanoelectronic devices hinges upon the knowledge of key underpinning parameters, which still remain elusive. In this paper, we first summarize the experimental measurements of the deformation of graphene membranes due to interactions with the STM probe tip and a back gate electrode. We then carry out systematic coarse grained, (CG), simulations to offer a mechanistic interpretation of STM tip-induced straining of the graphene drumhead. Our findings reveal the effect of (i) the position of the STM probe tip relative to the graphene drumhead center, (ii) the sizes of both the STM probe tip and graphene drumhead, as well as (iii) the applied back-gate voltage, on the induced strain field and corresponding pseudomagnetic field. These results can offer quantitative guidance for future design and implementation of reversible and on-demand formation of graphene QDs in nanoelectronics.

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“…The tailored GNR-k structures are helpful to improve ductility and brittle behavior. 22,23 The GNR-k structures exhibit strong yield and fracture strains that can be up to three times higher than that of the pristine graphene nanoribbon (GNR) using molecular dynamics simulations (MD) according to the latest study. 22 Although the mechanical properties of GNR-k have been studied, their thermal conductivity of GNR-k and the effect of their geometry parameters are still not clear.…”

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of graphene kirigami: Ultralow and strain robustness

Wei

Yang

Cai

et al. 2016

Carbon

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Kirigami structure, from the macro-to the nanoscale, exhibits distinct and tunable properties from original 2-dimensional sheet by tailoring. In present work, the extreme reduction of the thermal conductivity by tailoring sizes in graphene nanoribbon kirigami (GNR-k) is demonstrated using nonequilibrium molecular dynamics simulations. The results show that the thermal conductivity of GNR-k (around 5.1 Wm-1K-1) is about two orders of magnitude lower than that of the pristine graphene nanoribbon (GNR) (around 151.6 Wm-1K-1), while the minimum value is expected to be approaching zero in extreme case from our theoretical model. To explore the origin of the reduction of the thermal conductivity, the micro-heat flux on each atoms of GNR-k has been further studied. The results attribute the reduction of the thermal conductivity to three main sources as: the elongation of real heat flux path, the overestimation of real heat flux area and the phonon scattering at the vacancy of the edge. Moreover, the strain engineering effect on the thermal conductivity of GNR-k and a thermal robustness property has been investigated. Our results provide physical insights into the origins of the ultralow and robust thermal conductivity of GNR-k, which also suggests that the GNR-k can be used for nanaoscale heat management and thermoelectric application.

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Extremely compliant and highly stretchable patterned graphene

Cited by 45 publications

References 51 publications

Fracture of graphene: a review

Fracture of graphene: a review

Pseudomagnetic fields in a locally strained graphene drumhead

Thermal conductivity of graphene kirigami: Ultralow and strain robustness

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