The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets

Abstract

Ultrathin two-dimensional nanosheets of layered transition metal dichalcogenides (TMDs) are fundamentally and technologically intriguing. In contrast to the graphene sheet, they are chemically versatile. Mono- or few-layered TMDs - obtained either through exfoliation of bulk materials or bottom-up syntheses - are direct-gap semiconductors whose bandgap energy, as well as carrier type (n- or p-type), varies between compounds depending on their composition, structure and dimensionality. In this Review, we describe how the tunable electronic structure of TMDs makes them attractive for a variety of applications. They have been investigated as chemically active electrocatalysts for hydrogen evolution and hydrosulfurization, as well as electrically active materials in opto-electronics. Their morphologies and properties are also useful for energy storage applications such as electrodes for Li-ion batteries and supercapacitors.

Electronic and Optoelectronic Applications Based on 2D Novel Anisotropic Transition Metal Dichalcogenides

“…The common chemical formula of TMDs is MX 2 , where M is a transition metal (group IVB–VIIB; M = Mo, W, Re, and so on) and X is a chalcogen (group VIA; X = S, Se, Te) 14, 15. The sandwich structure of TMDs leads to excellent electronic and optoelectronic properties 14, 15, 16, 17, 18. Currently, TMDs exhibit satisfying properties in various applications 19, 20, 21, 22.…”

Booming Development of Group IV–VI Semiconductors: Fresh Blood of 2D Family

“…These 2DLMs possess different properties such as electronic structures, large specific surface area, and the quantum confinement of electrons due to the ultrathin thickness compared with their bulk counterparts, thus paving a new way for the next generation electronic, optical, optoelectronic, and flexible systems 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. Taking graphene, for example, the single layer of graphite has promising applications in broadband optical modulators16 and ultrafast high frequency photosensors17 due to the linear dispersion of the Dirac electrons 18.…”

Chemical Vapor Deposition of High‐Quality Large‐Sized MoS2 Crystals on Silicon Dioxide Substrates

“…To date, many efforts have been developed to prepare monolayer MoS 2 , including micromechanical exfoliation, chemical exfoliation, hydrothermal synthesis, and physical vapor deposition 2, 15, 16. Among these methods, chemical vapor deposition (CVD) is most promising in terms of scalability, simple operation and low cost, and has been used to grow various 2D materials directly on dielectric substrates 17, 18, 19, 20, 21, 22, 23, 24, 25, 26.…”