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Edge structures are highly relevant to the electronic, magnetic and catalyticproperties of two-dimensional (2D) transition metal dichalcogenides (TMDs) andtheir one dimensional (1D) counterpart, i.e., nanoribbons, which should beprecisely tailored for the desirable applications. In this work, we report theformation of novel Mo6S6 nanowire (NW) terminated edges in a monolayermolybdenum disulfide (MoS2) via an e-beam irradiation process combined withhigh temperature heating in a scanning transmission electron microscope (STEM).Atomic structures of NW terminated edges and the dynamic formation process wereobserved experimentally. Further analysis shows that NW terminated edge couldform on both Mo-zigzag (ZZ) edge and S-ZZ edge which can exhibit even higherstability superior to the pristine zigzag (ZZ) and armchair (AC) edge. Inaddition, the analogous edge structures can be also formed in MoS2 nanoribbonand other TMDs material such as MoxW1-xSe2. We believe that the presence ofthese novel edge structures in 2D and 1D TMD materials may provide novelproperties and new opportunities for their versatile applications includingcatalytic, spintronic and electronic devices.

In-situ fabrication of Mo6S6 nanowire terminated edges in monolayer molybdenum disulfide