Journal
ACS NANO
Volume 8, Issue 10, Pages 9914-9924Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5042703
Keywords
heterostructures; 2D crystals; van der Waals interaction; strain; Raman spectroscopy; MoS2
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Funding
- Royal Society
- U.S. Army Research Office (ARO)
- Royal Academy of Engineering
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In this work, we use Raman spectroscopy as a nondestructive and rapid technique for probing the van der Waals (vdW) forces acting between two atomically thin crystals, where one is a transition metal dichalcogenide (TMDC). In this work, MoS2 is used as a Raman probe: we show that its two Raman-active phonon modes can provide information on the interaction between the two crystals. In particular, the in-plane vibration (E-2g(1)) provides information on the in-plane strain, while the out-of-plane mode (A(1g)) gives evidence for the quality of the interfacial contact. We show that a vdW contact with MoS2 is characterized by a blue shift of +2 cm(-1) of the A1g peak. In the case of a MoS2/graphene heterostructure, the vdW contact is also characterized by a shift of +14 cm(-1) of the 2D peak of graphene. Our approach offers a very simple, nondestructive, and fast method to characterize the quality of the interface of heterostructures containing atomically thick TMDC crystals.
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