含层间键合的应变碳氮化物纳米片各向异性力学和电学性质的从头算研究
Ab initio study of anisotropic mechanical and electronic properties of strained carbon-nitride nanosheet with interlayer bonding
摘要：
由于IV族和V族元素单分子膜在结构上的相似性以及在元素周期表中的相邻性，IV族和V族元素的组合能否形成稳定的纳米片结构并具有良好的性能引起了人们的极大兴趣。在这项工作中，我们进行了第一性原理模拟研究的弹性，振动和电子性质的氮化碳（CN）纳米片在起皱的蜂窝结构与共价层间键合。已经证明，CN纳米片的结构稳定性基本上由相对原子层中相邻碳原子之间的强层间\so \键合维持。一个负的泊松比在双轴变形下的面外方向，和极端的面内刚度的CN纳米片，仅略逊于单层石墨烯，被揭示。此外，CN纳米片的拉伸应变的高度各向异性的机械和电子响应进行了探索。
英文摘要：
Due to the noticeable structural similarity and being neighborhood in periodic table of group-IV and -V elemental monolayers, whether the combination of group-IV and -V elements could have stable nanosheet structures with optimistic properties has attracted great research interest. In this work, we performed first-principles simulations to investigate the elastic, vibrational and electronic properties of the carbon nitride (CN) nanosheet in the puckered honeycomb structure with covalent interlayer bonding. It has been demonstrated that the structural stability of CN nanosheet is essentially maintained by the strong interlayer \so\ bonding between adjacent carbon atoms in the opposite atomic layers. A negative Poisson's ratio in the out-of-plane direction under biaxial deformation, and the extreme in-plane stiffness of CN nanosheet, only slightly inferior to the monolayer graphene, are revealed. Moreover, the highly anisotropic mechanical and electronic response of CN nanosheet to tensile strain have been explored.
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