Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.288
Publication date: 18th December 2023
Transition metal dichalcogenides (TMDCs) such as MoS2 and WS2 are well studied van der Waals materials forming stable layers without dangling bonds.
Recently, we obtained colloidal, phase-pure mono- and few-layered semiconducting MoS2 and WS2 nanoplatelets (NPLs).[1] The wet-chemical approach allows for the formation of scalable amounts of TMDC NPLs with different lateral sizes, each with a highly monodisperse size distribution.[1,2] By confining the 2D NPLs not only in z-direction but also in the lateral dimension, the excitonic features can be shifted to higher energy, allowing a limited extend of band tuning.[1] Expanding on these findings, we show, that besides changing the morphology of the NPLs, it is possible to further tune the band structure of colloidal TMDCs via the composition of MoS2 and WS2 content in the structure. The study of the optical transitions shifting as a function of the elemental composition is supported by microscopic and macroscopic structural information from scanning transmission electron spectroscopy (STEM) and Raman spectroscopy. This wet chemical synthesis protocol is designed to be adapted also for other combinations of TMDCs. Alloying is the next step for tailoring colloidal TMDCs towards optoelectronics, catalysis and sensing.[3]
[1] Niebur, A.; Söll, A.; Haizmann, P.; Strolka, O.; Rudolph, D.; Tran, K.; Renz, F.; Frauendorf, A.; Hübner, J.; Peisert, H.; Scheele, M.; Lauth, J. Untangling the intertwined: metallic to semiconducting phase transition of colloidal MoS2 nanoplatelets and nanosheets. Nanoscale, 2023,15, 5679-5688.
[2] Frauendorf, A.; Niebur, A.; Harms, L.; Shree, S.; Urbaszek, B.; Oestreich, M.; Hübner, J.; Lauth, J. Room Temperature Micro-Photoluminescence Studies of Colloidal WS2 Nanosheets. J. Phys. Chem. C 2021, 125, 34, 18841–18848.
[3] Xie, L. Two-dimensional transition metal dichalcogenide alloys: preparation, characterization and applications. Nanoscale, 2015,7, 18392-18401.
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