Liu Jinxin, Zhou Lu, Huang Ke, Song Xianyin, Chen Yunxu, Liang Xiaoyang, Gao Jin, Xiao Xiangheng, Rümmeli Mark H, Fu Lei
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
Institute for Advanced Studies, Wuhan University, Wuhan 430072, China.
iScience. 2019 Mar 29;13:277-283. doi: 10.1016/j.isci.2019.02.025. Epub 2019 Mar 1.
The lattice directly determines the electronic structure, and it enables controllably tailoring the properties by deforming the lattices of two-dimensional (2D) materials. Owing to the unbalanced electrostatic equilibrium among the dislocated atoms, the deformed lattice is thermodynamically unstable and would recover to the initial state. Here, we demonstrate that the recovery of deformed 2D lattices could be directly regulated via doping metal donors to reconstruct electrostatic equilibrium. Compared with the methods that employed external force fields with intrinsic instability and nonuniformity, the stretched 2D molybdenum diselenide (MoSe) could be uniformly retained and permanently preserved via doping metal atoms with more outermost electrons and smaller electronegativity than Mo. We believe that the proposed strategy could open up a new avenue in directly regulating the atomic-thickness lattice and promote its practical applications based on 2D crystals.
晶格直接决定电子结构，并且通过使二维（2D）材料的晶格变形能够可控地定制其性能。由于位错原子之间的静电平衡不平衡，变形的晶格在热力学上是不稳定的，会恢复到初始状态。在此，我们证明通过掺杂金属施主来重建静电平衡，可以直接调控变形二维晶格的恢复。与采用具有内在不稳定性和不均匀性的外力场的方法相比，通过掺杂比钼具有更多最外层电子和更小电负性的金属原子，可以使拉伸的二维二硒化钼（MoSe₂）均匀保留并永久保持。我们相信，所提出的策略可以为直接调控原子厚度的晶格开辟一条新途径，并推动其基于二维晶体的实际应用。
