3D model (JSmol)
|Molar mass||353.026 g·mol−1|
|Appearance||opaque metallic yellowish white|
|Band gap||0 (bulk) 1.3 eV monolayer|
|space group P3m1 164 hexagonal|
a = 3.728, c = 5.031
|platinum disulfide platinum ditelluride PtSeTe PtSSe|
|palladium diselenide NiSeTe|
Related platinum selenides
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Platinum diselenide is a transition metal dichalcogenide (TMDC) consisting of the metal platinum and the non-metal selenium with the formula PtSe2. Being a layered substance, PtSe2 can be split into thin layers down to three atoms thick called monolayers. PtSe2 is a semimetal or semiconductor depending on thickness.
Minozzi was the first to report synthesising platinum diselenide from the elements in 1909.
In addition to these selenization methods, PtS2 can be made by precipitation in water solution of Pt(IV) treated with hydrogen selenide, or by heating platinum tetrachloride with elemental selenium.
Platinum diselenide occurs naturally as the mineral Sudovikovite. It was named after Russian petrologist, N.G. Sudovikov who lived from 1903 to 1966. The mineral's hardness is 2 to 21/. Sudovikovite was found in the Srednyaya Padma mine, Velikaya Guba uranium-vanadium deposit, Zaonezhie peninsula, Karelia Republic, Russia.
Platinum diselenide forms crystals in the cadmium iodide structure. This means that the substance forms layers. Each of the monolayers has a central bed of platinum atoms, with a sheet of selenium atoms above and below. This structure is also called "1T" and has an trigonal structure. The layers are only weakly bonded together, and it is possible to exfoliate layers to bilayers or monolayers.
Phonon vibrations are designated by the infrared active A2u (Se vibrating out of plane opposite to Pt), Eu (in layer vibration, Se opposite to Pt), and Raman active A1g (Se top and bottom atoms moving out of plane in opposite directions 205 cm−1), and Eg (In plane, top and botom Se atoms moving opposite 175 cm−1). In the Raman spectrum, the A1g is lessened when stimulated emissions polarised perpendicular to the incoming rays are measured. The Eg mode is red-shifted when more layers are stacked. (166 cm−1 for bilayer and 155 cm−1 for bulk material) The A1g emission only has a slight change when thickness varies.
The band gap is calculated as 1.2 eV for monolayers, and 0.21 eV for bilayers. For a trylayer or thicker the substance loses a bandgap and becomes semimetallic.
PtSe2 can change its conductance in the presence of particular gases, such as nitrogen dioxide. Within a few seconds, NO2 absorbs on the surface of the PtSe2 material and lowers the resistance. When the gas is absent, high resistance returns again in about a minute.
Although platinum diselenide is nonmagnetic, when there are up to 10% platinum vacancies and it is put under 5% strain it is predicted to become ferromagnetic.
Monolayers of platinum diselenide show helical spin texture, which is not expected for centrosymmetric materials such as this. This property could be due to a local dipole induced Rashba effect. It means that PtSe2 is a potential spintronics material.
Water can physisorb to the surface of platinum dielenide with an energy of −0.19 eV, and similarly for oxygen with energy −0.13 eV. Water and oxygen do not react at toom temperature, because significant energy would be required to break apart the molecules.
Palladium diselenide has a different modified pyrite structure. Palladium ditelluride has a similar structure to platinum diselenide. Platinum disulfide is a semiconductor, and platinum ditelluride is metallic in nature.
More complex substances with platinum and selenium also exist, including the quaternary chalcogenides Rb2Pt3USe6 and Cs2Pt3USe6
Jacutingaite is a ternary platinum selenide HgPtSe3.
Platinum diselenide is proposed for use as a mid-infra red detector superior to black phosphorus in durability in air. Also it can work as a catalyst, and can be built into field effect transistors.
Combined with graphene it can be a photocatalyst, converting water and oxygen to reactive hydroxyl radical and superoxide. This reaction works when photons produce holes and electrons. The holes can neutralise hydroxide to make hydroxyl, and the electrons attach to oxygen to make superoxide. These reactive species can mineralise organic matter.
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