Capture the growth kinetics of CVD growth of two-dimensional MoS 2

Dancheng Zhu, Haibo Shu, Feng Jiang, Danhui Lv, Vijayshankar Asokan, Omar Salih Omar, Jun Yuan, Ze Zhang, Chuanhong Jin

Research output: Contribution to journalArticlepeer-review

Abstract

Understanding the microscopic mechanism is fundamental for function-oriented controlled chemical vapor deposition growth of two-dimensional (2D) materials. In this work, we reveal the growth kinetics of 2D MoS2 by capturing the nucleation seeds, evolving morphology, edge structure, and edge terminations at the atomic scale during chemical vapor deposition growth using the transmission electron microscopy and scanning transmission electron microscopy. The direct growth of few-layer and mono-layer MoS2 onto graphene-based transmission electron microscopy grids helped us to perform the subsequent transmission electron microscopy characterization without any solution-based transfer. Two seeding centers are observed: (i) Mo-oxysulfide (MoO x S2−y ) nanoparticles either in multi-shelled fullerene-like structures or as compact nanocrystals for the growth of fewer-layer MoS2; (ii) Mo-S atomic clusters. In the early stage growth, irregular polygons with two primary edge terminations, S-Mo Klein edges and Mo zigzag edges, appear approximately in equal numbers. The morphology evolves into a near-triangle shape in which Mo zigzag edges predominate. Results from density-functional theory calculations are consistent with the inferred growth kinetics, and thus support the growth mechanism we proposed. In general, the growth mechanisms found here should also be applicable in other 2D materials, such as MoSe2, WS2 and WSe2.
Original languageEnglish
Article number8
Pages (from-to)1-8
Number of pages8
Journal2D Materials and Applications
Volume1
Issue number1
DOIs
Publication statusPublished - 8 May 2017

Bibliographical note

Funding Information:
We thank Prof. Feng Ding for his critical comments, Zhepeng Zhang and Prof. Yanfeng Zhang for providing us highquality graphene samples and the Center of Electron Microscopy of Zhejiang University for the access to the microscope facilities. J.Y. acknowledges supports from Pao Yu-Kong International Foundation for a Chair Professorship in ZJU. H.B.S. acknowledged computational resources from the Shanghai Supercomputer Center. This work was financially supported by the National Basic Research Program of China (Grant No. 2014CB932500 and No. 2015CB921004), the National Science Foundation of China (Grant No. 51472215, No. 51222202, and No. 11404309) and the 111 project (No. B16402). J.Y. acknowledges the EPSRC (UK) funding EP/G070326.

Publisher Copyright:
© 2017, The Author(s).

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Copyright 2019 Elsevier B.V., All rights reserved.

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