Ultrasoft slip-mediated bending in few-layer graphene.,Nature Materials

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Ultrasoft slip-mediated bending in few-layer graphene.
Nature Materials ( IF 37.2 ) Pub Date : 2019-11-11 , DOI: 10.1038/s41563-019-0529-7
Edmund Han ₁ , Jaehyung Yu ₂ , Emil Annevelink ₂ , Jangyup Son ₂ , Dongyun A Kang ₂ , Kenji Watanabe ₃ , Takashi Taniguchi ₃ , Elif Ertekin _{2,

4} , Pinshane Y Huang _{1,

4} , Arend M van der Zande _{2,

4}

Affiliation

Continuum scaling laws often break down when materials approach atomic length scales, reflecting changes in their underlying physics and the opportunities to access unconventional properties. These continuum limits are evident in two-dimensional materials, where there is no consensus on their bending stiffnesses or how they scale with thickness. Through combined computational and electron microscopy experiments, we measure the bending stiffness of graphene, obtaining 1.2-1.7 eV for a monolayer. Moreover, we find that the bending stiffness of few-layer graphene decreases sharply as a function of bending angle, tuning by almost 400% for trilayer graphene. This softening results from shear, slip and the onset of superlubricity between the atomic layers and corresponds with a gradual change in scaling power from cubic to linear. Our results provide a unified model for bending in two-dimensional materials and show that their multilayers can be orders of magnitude softer than previously thought, among the most flexible electronic materials currently known.

中文翻译：

几层石墨烯中的超软滑移介导的弯曲。

当材料接近原子长度标度时，连续谱定律通常会失效，这反映了其基本物理的变化以及获得非常规性质的机会。这些连续性极限在二维材料中很明显，在它们的弯曲刚度或厚度如何缩放方面尚无共识。通过组合的计算和电子显微镜实验，我们测量了石墨烯的弯曲刚度，获得了单层1.2-1.7 eV。此外，我们发现，几层石墨烯的弯曲刚度随弯曲角度的变化而急剧下降，三层石墨烯的弯曲刚度几乎提高了400％。这种软化是由于原子层之间的剪切，滑移和超润滑性的出现而引起的，并且与标度功率从立方到线性的逐渐变化相对应。

更新日期：2019-11-13

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