Distinctive in-Plane Cleavage Behaviors of Two-Dimensional Layered Materials
Distinctive in-Plane Cleavage Behaviors of Two-Dimensional Layered Materials
复制标题
二维层状材料独特的面内解理行为
DOI：
10.1021/acsnano.6b05063
复制
发表时间：
2016-09-01
期刊：
影响因子：
17.1
通讯作者：
Chai, Yang
中科院分区：
文献类型：
--
作者：
Guo, Yao;Liu, Chunru;Chai, Yang
机械剥离法是制备二维层状材料的一种常用方法，它不仅涉及层间面外解理，还涉及层间面内断裂。通过对剥离的2D薄片的统计分析，我们揭示了六种代表性层状材料的面内解理行为，包括石墨烯，h-BN，2 H相MoS 2，IT相PtS 2，FePS 3和黑磷。除了公知的层间解理，这些2D层状材料显示出沿沿着某些面内晶体学取向断裂的独特趋势。通过理论建模和分析，这些不同的面内解理行为可以被理解为断裂过程中弹性能的释放和表面能的增加之间的竞争的结果。更重要的是，这些面内解理行为提供了一种快速和非侵入性的方法，使用光学显微镜来识别机械剥离的2D层状材料的晶格方向。
Mechanical exfoliation from bulk layered crystal is widely used for preparing two-dimensional (2D) layered materials, which involves not only out-of-plane interlayer cleavage but also in-plane fracture. Through a statistical analysis on the exfoliated 2D flakes, we reveal the in-plane cleavage behaviors of six representative layered materials, including graphene, h-BN, 2H phase MoS2, IT phase PtS2, FePS3, and black phosphorus. In addition to the well-known interlayer cleavage, these 2D layered materials show a distinctive tendency to fracture along certain in-plane crystallography orientations. With theoretical modeling and analysis, these distinct in-plane cleavage behaviors can be understood as a result of the competition between the release of the elastic energy and the increase of the surface energy during the fracture process. More importantly, these in-plane cleavage behaviors provide a fast and noninvasive method using optical microscopy to identify the lattice direction of mechanical exfoliated 2D layered materials.