Metallic vanadium disulfide nanosheets as a platform material for multifunctional electrode applications

Abstract

Nano-thick metallic transition metal dichalcogenides such as VS${}_2$ are essential building blocks for constructing next-generation electronic and energy-storage applications, as well as for exploring unique physical issues associated with the dimensionality effect. However, such 2D layered materials have yet to be achieved through either mechanical exfoliation or bottom-up synthesis. Herein, we report a facile chemical vapor deposition route for direct production of crystalline VS${}_2$ nanosheets with sub-10 nm thicknesses and domain sizes of tens of micrometers. The obtained nanosheets feature spontaneous superlattice periodicities and excellent electrical conductivities (~3$\times$10${}^3$ S cm${}^{-1}$), which has enabled a variety of applications such as contact electrodes for monolayer MoS${}_2$ with contact resistances of ~1/4 to that of Ni/Au metals, and as supercapacitor electrodes in aqueous electrolytes showing specific capacitances as high as 8.6$\times$10${}^2$ F g${}^{-1}$. This work provides fresh insights into the delicate structure-property relationship and the broad application prospects of such metallic 2D materials.

arXiv comment23 pages, 5 figues

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• Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves
• Tunable magnetism in bilayer transition metal dichalcogenides
• Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2
• Electron-phonon interaction, magnetic phase transition, charge density waves and resistive switching in VS2 and VSe2 revealed by Yanson point contact spectroscopy
• Electronic structure and charge-density wave transition in monolayer VS_{2}
• A full gap above the Fermi level: the charge density wave of monolayer VS2