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

详细信息    查看全文

• 作者：Vasilii I. Artyukhov ; Zhili Hu ; Zhuhua Zhang ; Boris I. Yakobson
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：June 8, 2016
• 年：2016
• 卷：16
• 期：6
• 页码：3696-3702
• 全文大小：425K
• 年卷期：0
• ISSN：1530-6992

文摘

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° lattice misorientation angles.