Monolayer MoS2 Dendrites on a Symmetry-Disparate SrTiO3 (001) Substrate: Formation Mechanism and Interface Interaction

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• 作者：Yu Zhang ; Qingqing Ji ; Jinxiu Wen ; Jiu Li ; Cong Li ; Jianping Shi ; Xiebo Zhou ; Kebin Shi ; Huanjun Chen ; Yuanchang Li ; Shaozhi Deng ; Ningsheng Xu ; Zhongfan Liu and Yanfeng Zhang
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：May 17, 2016
• 年：2016
• 卷：26
• 期：19
• 页码：3299-3305
• 全文大小：1714K
• ISSN：1616-3028

文摘

Dendritic patterns generated in non-equilibrium growth processes are prevalent in nature while their formation mechanisms are far from fully understood. Here, we report a coverage-dependent fractal degree evolution of monolayer 2H-MoS₂ dendrites synthesized on a symmetry-disparate substrate of SrTiO₃ (001). Surprisingly, various characterizations have revealed that the monolayer dendrites featured with orthogonal backbones are single crystalline, possessing both peculiar adlayer-substrate interaction and abnormal indirect bandgap on SrTiO₃ (001). Further theoretical calculations indicate that a prominent diffusion anisotropy of monomer precursors, combined with the disparate adlayer-substrate symmetry, determine the diffusion-limited aggregation of MoS₂ towards dendritic shapes. This work provides brand-new insights in the morphological engineering of two-dimensional atomic crystals, and contributes greatly to an in-depth understanding of the detailed dynamics in non-equilibrium crystal growth.