Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Abstract

The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.

Metallic MoS2 for High Performance Energy Storage and Energy Conversion

“…Mallouk et al [79] confirmed that the peaks of E g can switch between 284 and 307 cm −1 . Furthermore, other reports clarified that the J 1 , J 2 , and J 3 can also shift a little, [65,66,80,81] which is probably due to the different layer distance. Generally, Raman spectra measurement is the most basic technique to identify the metallic phase of MoS 2 .…”

Multifunctional coatings of exfoliated and reassembled graphite on cellulosic substrates

“…The outstanding properties of graphene and related 2D materials (GRM) have been attracting great attention and they are being explored to create nanomaterials that perform multiple functions in various applications. [1][2][3][4][5][6][7][8][9][10][11][12][13] Composites are the most common industrial graphene-based products but the quality of commercially available graphene is usually low, compared to the materials obtained in the laboratory. Graphene is often commercially supplied as a powder and it is not possible to expect that <1 nm thin, electroneutral sheets will remain well separated, when they touch each other, due to the omnipresent van der Waals forces.…”

Microwave Hydrothermal Synthesis of 1T@2H−MoS2 as an Excellent Photocatalyst

“…Photocatalysis is one of the environmental-friendly methods to degrade organic pollutants, reduce carbon dioxide and realize solar energy conversion. [1][2][3][4][5][6] Among the semiconductor materials, two-dimensional (2D) transition-metal dichalcogenides (TMDs), such as MoS 2 , have attracted numerous attention owing to their unique photoelectric properties, [7][8][9][10] especially for the utilization in catalysis. Indeed, 2HÀ MoS 2 is an ideal photocatalytic material with band gap value around 1.2~1.9 eV, [11] showing superior catalytic ability at the edge of 2D structure.…”