Novel single-layer vanadium sulphide phases. (25th July 2018)

• Record Type: Journal Article
• Authors: Arnold, Fabian; Stan, Raluca-Maria; Mahatha, Sanjoy K; Lund, H E; Curcio, Davide; Dendzik, Maciej; Bana, Harsh; Travaglia, Elisabetta; Bignardi, Luca; Lacovig, Paolo; Lizzit, Daniel; Li, Zheshen; Bianchi, Marco; Miwa, Jill A; Bremholm, Martin; Lizzit, Silvano; Hofmann, Philip; Sanders, C E
• Is Part Of: 2D materials. Volume 5:Number 4(2018)
• Publication Date: 2018-07-25
• Subjects: x-ray photoelectron diffraction -- scanning tunneling microscopy -- x-ray photoelectron spectroscopy -- VS2 -- low-energy electron diffraction; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/aad0c8
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: VS2 is a challenging material to prepare stoichiometrically in the bulk, and the single layer has not been successfully isolated before now. Here we report the first realization of single-layer VS2, which we have prepared epitaxially with high quality on Au(1 1 1) in the octahedral (1T) structure. We find that we can deplete the VS2 lattice of S by annealing in vacuum so as to create an entirely new 2D compound that has no bulk analogue. The transition is reversible upon annealing in an H2 S gas atmosphere. We report the structural properties of both the stoichiometric and S-depleted compounds on the basis of low-energy electron diffraction, x-ray photoelectron spectroscopy and diffraction, and scanning tunneling microscopy experiments.