Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.132
Publication date: 6th July 2018
Semiconducting monolayers hold many promises for the development of optoelectronic and spintronic devices, but are comparatively less explored for light harvesting. This situation is partly due to the lack of adequate materials: current production strategies (exfoliation and epitaxial growths) are limited to explore the wide range of potential two-dimensional (2D) materials for light conversion applications. Using colloidal chemistry to synthesize monolayers opens up the possibility to achieve an unprecedented control over the size, edges nature, composition and structure of the nanosheets. This control would allow to precisely engineer their electronic and optical properties to produce highly efficient monolayer-based nanomaterials for light conversion applications.
Using tungsten disulfide as a prototype material, we explored the transition metal dichalcogenide (TMDC) colloidal synthesis, through a strategy relying on precursors decomposition in high boiling point organic solvent. After having identified conditions to reproducibly synthetize colloidal WS2 monolayers in the metallic 1T crystal structure,1 we systematically modify the reaction parameters. The obtained protocols allow us to tune the crystal structure as well as the shape and the aggregation of WS2 nanosheets. These first steps demonstrate the potential of colloidal synthesis to prepare TMDCs nanosheets of controlled crystal structure, shape and thickness. Other materials and alloys can also be prepared through this approach, as recently demonstrated by other groups for WSe22 and MoxW1-xS2.3
(1) Mahler, B.; Hoepfner, V.; Liao, K.; Ozin, G. A. J. Am. Chem. Soc. 2014, 136, 14121.
(2) Jung, W.; Lee, S.; Yoo, D.; Jeong, S.; Miró, P.; Kuc, A.; Heine, T.; Cheon, J. J. Am. Chem. Soc. 2015, 137, 7266.
(3) Sun, Y.; Fujisawa, K.; Lin, Z.; Lei, Y.; Mondschein, J. S.; Terrones, M.; Schaak, R. E. J. Am. Chem. Soc. 2017, 139, 11096.
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