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arXiv 1012.5246cond-mat.mes-hall
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弯曲圆形单层石墨烯:石墨烯纳米碗

Buckled circular monolayer graphene: a graphene nano-bowl

M. Neek-Amal, F. M. Peeters

摘要:

我们采用非平衡分子动力学模拟研究了圆形单层石墨烯在径向载荷作用下的稳定性。当单层石墨烯受到径向应力时,在一些小的圆形应变($\sim 0.4%$)之后,它会膨胀并弯曲成新的碗状形状。由屈曲门槛值前的应力-应变线性关系计算了杨氏模量,与实验结果吻合较好。给出了弹性理论对径向应力板屈曲临界值的预测,并将其结果与原子模拟结果进行了比较。利用Jarzynski等式估计了非压缩态和屈曲态的自由能之差。从自由能的计算,我们得到的最佳半径的系统感觉到最小的边界应力。

英文摘要:

We investigate the stability of circular monolayer graphene subjected to a radial load using non-equilibrium molecular dynamics simulations. When monolayer graphene is radially stressed, after some small circular strain ($\sim 0.4%$) it buckles and bends into a new bowl like shape. Young's modulus is calculated from the linear relation between stress and strain before the buckling threshold, which is in agreement with experimental results. The prediction of elasticity theory for the buckling threshold of a radially stressed plate is presented and its results are compared to the one of our atomistic simulation. Jarzynski equality is used to estimate the difference between the free energy of the non-compressed states and the buckled states. From a calculation of the free energy we obtain the optimum radius for which the system feels the minimum boundary stress.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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