Structure of single-molecular-layerMoS2

Substrate interactions with suspended and supported monolayerMoS2: Angle-resolved photoemission spectroscopy

“…While this result is limited by the large error, our measurement suggests the presence of a ~3.6% lateral lattice expansion in monolayer MoS 2 compared to bulk, yielding a lattice constant of 3.28±0.10 Å. In X-ray diffraction and Raman-scattering studies of single layer MoS 2 prepared by exfoliation of Liintercalated MoS 2 powder immersed in water, Yang et al also reported that the inplane lattice constant expands to 3.27±0.015 , about 3.5% larger than the accepted bulk value (3.16 ) [22]. The authors attributed this lattice expansion to a change in the Mo coordination from trigonal prismatic for the case of dry MoS 2 to bulk octahedral for the water immersed MoS 2 .…”

Unusual Stacking Variations in Liquid-Phase Exfoliated Transition Metal Dichalcogenides

“…42 The 2H f 1T transformation is accompanied by changes in coordination from trigonal prismatic to octahedral and metalÀmetal bond distortions. 27,29,32,42 However, one outstanding issue of these studies was the lack of understanding of whether these effects were ARTICLE intrinsically due to exfoliation or to the presence of intercalated guest molecules among the layers. MoS 2 composites prepared via lithium intercalation indicated the retained presence of lithium in the restacked material even after washing.…”

Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers

“…A process of lithium-based chemical exfoliation of bulk crystals has been shown to be a successful route to obtain a metastable metallic phase of the group VI TMDs 18,[24][25][26] . It is, however, uncertain that this phase would persist under all realistic operating conditions, and reversible switching is not demonstrated in this case.…”