Vapour-liquid-solid growth of monolayer MoS nanoribbons.

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Nature materials, ISSN: 1476-1122, Vol: 17, Issue: 6, Page: 535-542

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Li, Shisheng; Lin, Yung-Chang; Zhao, Wen; Wu, Jing; Wang, Zhuo; Hu, Zehua; Shen, Youde; Tang, Dai-Ming; Wang, Junyong; Zhang, Qi; Zhu, Hai; Chu, Leiqiang; Zhao, Weijie; Liu, Chang; Sun, Zhipei; Taniguchi, Takaaki; Osada, Minoru; Chen, Wei; Xu, Qing-Hua; Wee, Andrew Thye Shen; Suenaga, Kazu; Ding, Feng; Eda, Goki Show More Hide
Chemistry; Materials Science; Physics and Astronomy; Engineering
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Chemical vapour deposition of two-dimensional materials typically involves the conversion of vapour precursors to solid products in a vapour-solid-solid mode. Here, we report the vapour-liquid-solid growth of monolayer MoS, yielding highly crystalline ribbons with a width of few tens to thousands of nanometres. This vapour-liquid-solid growth is triggered by the reaction between MoO and NaCl, which results in the formation of molten Na-Mo-O droplets. These droplets mediate the growth of MoS ribbons in the 'crawling mode' when saturated with sulfur. The locally well-defined orientations of the ribbons reveal the regular horizontal motion of the droplets during growth. Using atomic-resolution scanning transmission electron microscopy and second harmonic generation microscopy, we show that the ribbons are grown homoepitaxially on monolayer MoS with predominantly 2H- or 3R-type stacking. Our findings highlight the prospects for the controlled growth of atomically thin nanostructure arrays for nanoelectronic devices and the development of unique mixed-dimensional structures.