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(a) Structure of a hexagonal TMD monolayer. M atoms are in black and X atoms are in yellow. (b) A hexagonal TMD monolayer seen from above. Transition-metal dichalcogenide (TMD or TMDC) monolayers are atomically thin semiconductors of the type MX 2, with M a transition-metal atom (Mo, W, etc.) and X a chalcogen atom (S, Se, or Te).
Platinum diselenide is a transition metal dichalcogenide with the formula PtSe 2. It is a layered substance that can be split into layers down to three atoms thick. PtSe 2 can behave as a metalloid or as a semiconductor depending on the thickness.
MoS 2, the most common metal dichalcogenide, adopts a layered structure. Metal dichalcogenides have the formula ME 2, where M = a transition metal and E = S, Se, Te. [7] The most important members are the sulfides. They are always dark diamagnetic solids, insoluble in all solvents, and exhibit semiconducting properties. Some are superconductors ...
The oxidation of other semiconductor transition metal dichalcogenides (S-TMDs) such as MoS 2, has similarly been observed to occur in ambient light and atmospheric conditions. [9] WS 2 is also attacked by a mixture of nitric and hydrofluoric acid. When heated in oxygen-containing atmosphere, WS 2 converts to tungsten trioxide.
As in graphene, the layered structures of MoS 2 and other transition metal dichalcogenides exhibit electronic and optical properties [48] that can differ from those in bulk. [49] Bulk MoS 2 has an indirect band gap of 1.2 eV, [50] [51] while MoS 2 monolayers have a direct 1.8 eV electronic bandgap, [52] supporting switchable transistors [53 ...
NbSe 2 crystallizes in several related forms, and can be mechanically exfoliated into monatomic layers, similar to other transition metal dichalcogenide monolayers. Monolayer NbSe 2 exhibits very different properties from the bulk material, such as of Ising superconductivity, quantum metallic state, and strong enhancement of the CDW. [3]
Molybdenum diselenide (MoSe 2) is an inorganic compound of molybdenum and selenium.Its structure is similar to that of MoS 2. [6] Compounds of this category are known as transition metal dichalcogenides, abbreviated TMDCs.
The low-energy properties some semiconducting transition metal dichalcogenide monolayers, can be described by a two-dimensional massive (gapped) Dirac Hamiltonian with an additional term describing a strong spin–orbit coupling: [19] [20] [21] [22]