Direct TEM observations of growth mechanisms of two-dimensional MoS2 flakes

Linfeng Fei, Shuijin Lei, Wei-Bing Zhang, Wei Lu, Ziyuan Lin, Chi Hang Lam, Yang Chai () and Yu Wang ()
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Linfeng Fei: The Hong Kong Polytechnic University
Shuijin Lei: School of Materials Science and Engineering, Nanchang University, Nanchang
Wei-Bing Zhang: The Hong Kong Polytechnic University
Wei Lu: The Hong Kong Polytechnic University
Ziyuan Lin: The Hong Kong Polytechnic University
Chi Hang Lam: The Hong Kong Polytechnic University
Yang Chai: The Hong Kong Polytechnic University
Yu Wang: The Hong Kong Polytechnic University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract A microscopic understanding of the growth mechanism of two-dimensional materials is of particular importance for controllable synthesis of functional nanostructures. Because of the lack of direct and insightful observations, how to control the orientation and the size of two-dimensional material grains is still under debate. Here we discern distinct formation stages for MoS2 flakes from the thermolysis of ammonium thiomolybdates using in situ transmission electron microscopy. In the initial stage (400 °C), vertically aligned MoS2 structures grow in a layer-by-layer mode. With the increasing temperature of up to 780 °C, the orientation of MoS2 structures becomes horizontal. When the growth temperature reaches 850 °C, the crystalline size of MoS2 increases by merging adjacent flakes. Our study shows direct observations of MoS2 growth as the temperature evolves, and sheds light on the controllable orientation and grain size of two-dimensional materials.

Date: 2016
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DOI: 10.1038/ncomms12206

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