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arXiv 2203.01679cond-mat.mtrl-sci
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石墨烯机械二极管类结构中的“引导”断裂

'Guided' Fractures in Graphene Mechanical Diode-like Structures

Levi C. Felix, Douglas S. Galvao

摘要:

二极管的概念通常应用于电子和热设备,但很少用于机械设备。最近提出的三角形空隙缺陷的聚合物基结构中的断裂整流效应促使我们使用石墨烯膜在纳米级上测试这些想法。使用全原子反应分子动力学模拟,我们表明,强大的整流样效果存在。断裂可以被“引导”成沿一个特定方向比沿其相反方向更容易扩展。我们还观察到,存在一个最佳值的间距之间的每个空隙的整流效果。

英文摘要:

The concept of the diode is usually applied to electronic and thermal devices but very rarely for mechanical ones. A recently proposed fracture rectification effect in polymer-based structures with triangular voids defects has motivated us to test these ideas at the nanoscale using graphene membranes. Using fully-atomistic reactive molecular dynamics simulations we showed that robust rectification-like effects exist. The fracture can be 'guided' to easier propagate along one specific direction than its opposite. We also observed that there is an optimal value for the spacing between each void for the rectification effect.

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