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Topochemistry of Bowtie- and Star-Shaped Metal Dichalcogenide Nanoisland Formation

机译:领结和星状金属硫族化物纳米岛形成的拓扑化学

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摘要

A large number of experimental studies over the past few years observed the formation of unusual highly symmetric polycrystalline twinned nanoislands of transition metal dichalcogenides, resembling bowties or stars. Here, we analyze their morphology in terms of equilibrium and growth shapes. We propose a mechanism for these complex shapes' formation via collision of concurrently growing islands and validate the theory with phase-field simulations that demonstrate how highly symmetric structures can actually emerge from arbitrary starting conditions. Finally, we use first principles calculations to propose an explanation of the predominance of high-symmetry polycrystals with 60 degrees lattice misorientation angles.
机译:在过去的几年中,大量的实验研究发现过渡金属二卤化物的异常高对称多晶孪晶纳米岛的形成,类似于蝴蝶结或星形。在这里,我们根据平衡和生长形状来分析它们的形态。我们提出了通过同时生长的小岛碰撞来形成这些复杂形状的机制,并通过相场仿真验证了该理论,该相场仿真演示了如何在任意起始条件下实际出现高度对称的结构。最后,我们使用第一性原理计算来提出对具有60度晶格取向差角的高对称多晶晶体优势的解释。

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