Van der Waals Heterostructures based on Liquid Phase Exfoliated MoS2 and WS2 nanosheets. (2020)

• Record Type: Journal Article
• Authors: Sinha, Sneha; Jyotsna, ; Arora, Sunil K.
• Is Part Of: Materials today. Volume 21:Part 4(2020)
• Page Start: 1840
• Page End: 1845
• Publication Date: 2020
• Subjects: Transition metal dichalcogenides -- Liquid Exfoliation -- vdW Heterostructure; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2020.01.239
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: We have synthesized the van der Waals (vdW) heterostructures of two-dimensional layered materials (MoS2 and WS2 ) via physical mixing of different proportions of colloidal dispersions containing exfoliated MoS2 and WS2 nanosheets. The synthesized vdW heterostructures exhibited optical and phononic properties distinct from its components. We find that the A- and B- excitonic peak positions in heterostructures are red shifted with respect to the corresponding peak positions of the constituent materials (MoS2 and WS2 ) and are also dependent on the compositional ratio used to produce the heterostructures. The in-plane (E 1 2g ) and out-of-plane (A1g ) Raman modes in heterostructures exhibited hardening with respect to the corresponding modes in individual nanosheets of MoS2 and WS2 . Our results highlight the role of interlayer interactions in the synthesized MoS2 -WS2 heterostructures.