Mechanical properties of atomically thin boron nitride and the role of interlayer interactions.
Mechanical properties of atomically thin boron nitride and the role of interlayer interactions.
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DOI：
10.1038/ncomms15815
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发表时间：
2017-06-22
影响因子：
16.6
通讯作者：
Li LH
中科院分区：
文献类型：
--
作者：
Falin A;Cai Q;Santos EJG;Scullion D;Qian D;Zhang R;Yang Z;Huang S;Watanabe K;Taniguchi T;Barnett MR;Chen Y;Ruoff RS;Li LH
原子薄的氮化硼（BN）纳米片是重要的二维纳米材料，具有许多不同于石墨烯的独特性质，但对其机械性质的研究仍然不完整。在这里，我们报告说，高质量的单晶单层和少层BN纳米片是最强的电绝缘材料之一。更有趣的是，少层BN在压痕下显示出与少层石墨烯完全不同的机械行为。与石墨烯形成鲜明对比的是，当层数从1增加到8时，石墨烯的强度降低超过30%，BN纳米片的机械强度对厚度的增加不敏感。我们将这种差异归因于不同的层间相互作用，因此在这两种材料压痕下的滑动趋势。BN纳米片的显著更好的层间完整性使它们成为比石墨烯更有吸引力的候选物，用于几种应用，例如作为机械增强。原子级薄的氮化硼在其机械性能方面仍不充分。在这里，作者测试了高质量的单层和少层BN，并表明它是最强的电绝缘材料之一，并且在压痕下的层间完整性明显优于石墨烯。
Atomically thin boron nitride (BN) nanosheets are important two-dimensional nanomaterials with many unique properties distinct from those of graphene, but investigation into their mechanical properties remains incomplete. Here we report that high-quality single-crystalline mono- and few-layer BN nanosheets are one of the strongest electrically insulating materials. More intriguingly, few-layer BN shows mechanical behaviours quite different from those of few-layer graphene under indentation. In striking contrast to graphene, whose strength decreases by more than 30% when the number of layers increases from 1 to 8, the mechanical strength of BN nanosheets is not sensitive to increasing thickness. We attribute this difference to the distinct interlayer interactions and hence sliding tendencies in these two materials under indentation. The significantly better interlayer integrity of BN nanosheets makes them a more attractive candidate than graphene for several applications, for example, as mechanical reinforcements. Atomically thin boron nitride remains undercharacterized in terms of their mechanical properties. Here authors test high-quality mono- and few-layer BN and show it to be one of the strongest electrically insulating materials and dramatically better in interlayer integrity than graphene under indentation.