Atomically Flat Zigzag Edges in Monolayer MoS2 by Thermal Annealing

TitleAtomically Flat Zigzag Edges in Monolayer MoS2 by Thermal Annealing
Publication TypeJournal Article
Year of Publication2017
AuthorsChen, Q, Li, H, Xu, W, Wang, S, Sawada, H, Allen, CS, Kirkland, AI, Grossman, JC, Warner, JH
JournalNano Letters
Pagination5502 - 5507
Date Published2017/09//
ISBN Number1530-6984
Keywords2D materials, edges, electronic-structure, graphene, in situ heating, MoS2, nanocatalysts, nanoclusters, Nanoparticles, nanoribbons, reconstruction, sites, tem, transition metal dichalcogenides

The edges of 2D materials show novel electronic, magnetic, and optical properties, especially when reduced to nanoribbon widths. Therefore, methods to create atomically flat edges in 2D materials are essential for future exploitation. Atomically flat edges in 2D materials are found after brittle fracture or when electrically biasing, but a simple scalable approach for creating atomically flat periodic edges in monolayer 2D transition metal dichalcogenides has yet to be realized. Here, we show how heating monolayer MoS2 to 800 degrees C in vacuum produces atomically flat Mo terminated zigzag edges in nanoribbons. We study this at the atomic level using an ultrastable in situ heating holder in an aberration-corrected transmission electron microscope and discriminating Mo from S at the edge, revealing unique Mo terminations for all zigzag orientations that remain stable and atomically flat when cooling back to room temperature. Highly faceted MoS2 nanoribbon constrictions are produced with Mo rich edge structures that have theoretically predicted spin separated transport channels, which are promising for spin logic applications.

Short TitleNano Lett.