Strain engineering of graphene on rigid substrates

Zhang, Yang; Jin, Yiying; Liu, Jinglan; Ren, Qiang; Chen, Zhengyang; Zhao, Yi; Zhao, Pei

doi:10.1039/d2na00580h

Cited by 3 publications

(1 citation statement)

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“…Strain engineering or "straintronics" has emerged as a way to change the behavior of materials, in particular, 2D nanomaterials, especially graphene [1][2][3][4][5][6][7][8][9]. In this case, straintronics has been considered in recent years as a way to fine-tune, among other properties, its band gap in order to use it in many different applications [10][11][12][13][14][15][16][17][18][19]. In fact, strained graphene nanobubbles have been recently proposed as qubits for quantum computing [20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Small Quasi-Square Graphene Nanoflakes

Serna-Gutiérrez,

Cordero

2024

Crystals

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The rise of straintronics—the possibility of fine-tuning the electronic properties of nanosystems by applying strain to them—has enhanced the interest in characterizing the mechanical properties of these systems when they are subjected to tensile (or compressive), shear and torsion strains. Four parameters are customarily used to describe the mechanical behavior of a macroscopic solid within the elastic regime: Young’s and shear moduli, the torsion constant and Poisson’s ratio. There are some relations among these quantities valid for elastic continuous isotropic systems that are being used for 2D nanocrystals without taking into account the non-continuous anisotropic nature of these systems. We present in this work computational results on the mechanical properties of six small quasi-square (aspect ratio between 0.9 and 1.1) graphene nanocrystals using the PM7 semiempirical method. We use the results obtained to test the validity of two relations derived for macroscopic homogeneous isotropic systems and sometimes applied to 2D systems. We show they are not suitable for these nanostructures and pinpoint the origin of some discrepancies in the elastic properties and effective thicknesses reported in the literature. In an attempt to recover one of these formulas, we introduce an effective torsional thickness for graphene analogous to the effective bending thickness found in the literature. Our results could be useful for fitting interatomic potentials in molecular mechanics or molecular dynamics models for finite carbon nanostructures, especially near their edges and for twisted systems.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Small Quasi-Square Graphene Nanoflakes

Serna-Gutiérrez,

Cordero

2024

Crystals

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Strain Engineering of Twisted Bilayer Graphene: The Rise of Strain‐Twistronics

Hou,

Zhou,

Xue

et al. 2024

Small

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The layer‐by‐layer stacked van der Waals structures (termed vdW hetero/homostructures) offer a new paradigm for materials design—their physical properties can be tuned by the vertical stacking sequence as well as by adding a mechanical twist, stretch, and hydrostatic pressure to the atomic structure. In particular, simple twisting and stacking of two layers of graphene can form a uniform and ordered Moiré superlattice, which can effectively modulate the electrons of graphene layers and lead to the discovery of unconventional superconductivity and strong correlations. However, the twist angle of twisted bilayer graphene (tBLG) is almost unchangeable once the interlayer stacking is determined, while applying mechanical elastic strain provides an alternative way to deeply regulate the electronic structure by controlling the lattice spacing and symmetry. In this review, diverse experimental advances are introduced in straining tBLG by in‐plane and out‐of‐plane modes, followed by the characterizations and calculations toward quantitatively tuning the strain‐engineered electronic structures. It is further discussed that the structural relaxation in strained Moiré superlattice and its influence on electronic structures. Finally, the conclusion entails prospects for opportunities of strained twisted 2D materials, discussions on existing challenges, and an outlook on the intriguing emerging field, namely “strain‐twistronics”.

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