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Tuning the morphology and chemical composition of MoS2 nanostructures

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Abstract

Chemical vapor deposition has proven to be one of the most promising approaches to achieve large-scale and high-quality ultra-thin layered materials in general, and single- and few-layer transition metal dichalcogenides in particular. Therefore, the study of the conditions affecting the growth and the obtained structure (morphology and chemical composition) is of crucial importance in order to improve its consistency and generalize these methodologies for the growth of other 2D materials. Here, we show that the growth temperature and pressure have significant effect on the final MoS2 morphology, leading to completely different results: homogeneous surface coverage with inorganic fullerenes, loosely surface bound thin elongated hexagonal nanostructures and single-layer domains. This work focuses on the characterization of the less common elongated hexagonal nanostructures, including their growth mechanism, phase, chemical composition, doping and electronic properties. An interesting epitaxial relation between the MoS2 layers and the metal oxide particle, which may have practical implications in the future, is demonstrated and discussed as well. Finally, we demonstrate the in situ doping and alloying to form MoS2-xSex nanostructures. This work provides new insights into the growth mechanism puzzle of MoS2 nanostructures.

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Acknowledgements

G.R., T.S. and A.I. acknowledge the support from the Israel Science Foundation, Grant Number 1784/15, and the Israeli Ministry of Energy, research Grant Number 0605405442.

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  1. Department of Materials Science and Engineering, Tel Aviv University, Ramat Aviv, 6997801, Tel Aviv, Israel

    Gal Radovsky, Tom Shalev & Ariel Ismach

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  1. Gal Radovsky
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  2. Tom Shalev
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  3. Ariel Ismach
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Correspondence to Ariel Ismach.

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Radovsky, G., Shalev, T. & Ismach, A. Tuning the morphology and chemical composition of MoS2 nanostructures. J Mater Sci 54, 7768–7779 (2019). https://doi.org/10.1007/s10853-019-03437-4

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