Tungsten disulfide

"Tungsten sulfide" redirects here. Not to be confused with Tungsten trisulfide.
Tungsten disulfide

Left: WS2 film on sapphire. Right: dark exfoliated WS2 film floating on water
Names
IUPAC names
Tungsten sulfur
Bis(sulfanylidene)tungsten
Systematic IUPAC name
Dithioxotungsten
Other names
Tungsten(IV) sulfide
Tungstenite
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.032.027 Edit this at Wikidata
EC Number
  • 235-243-3
  • InChI=1S/2S.W checkY
    Key: ITRNXVSDJBHYNJ-UHFFFAOYSA-N checkY
  • InChI=1S/2S.W
    Key: ITRNXVSDJBHYNJ-UHFFFAOYSA-N
  • S=[W]=S
Properties
WS2
Molar mass 247.98 g/mol
Appearance Blue-gray powder[1]
Density 7.5 g/cm3, solid[1]
Melting point 1,250 °C (2,280 °F; 1,520 K) decomposes[1]
Slightly soluble
Band gap ~1.35 eV (optical, indirect, bulk)[2][3]
~2.05 eV (optical, direct, monolayer)[4]
+5850·10−6 cm3/mol[5]
Structure
Molybdenite
Trigonal prismatic (WIV)
Pyramidal (S2−)
Related compounds
Other anions
 Tungsten(IV) oxide
Tungsten diselenide
Tungsten ditelluride
Other cations
 Molybdenum disulfide
Tantalum disulfide
Rhenium disulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Tungsten disulfide is an inorganic chemical compound composed of tungsten and sulfur with the chemical formula WS2. This compound is part of the group of materials called the transition metal dichalcogenides. It occurs naturally as the rare mineral tungstenite. This material is a component of certain catalysts used for hydrodesulfurization and hydrodenitrification.

WS2 adopts a layered structure similar, or isotypic with MoS2, instead with W atoms situated in trigonal prismatic coordination sphere (in place of Mo atoms). Owing to this layered structure, WS2 forms non-carbon nanotubes, which were discovered after heating a thin sample of WS2 in 1992.[6]

  1. ^ a b c Cite error: The named reference b1 was invoked but never defined (see the help page).
  2. ^ Kam KK, Parkinson BA (February 1982). "Detailed photocurrent spectroscopy of the semiconducting group VIB transition metal dichalcogenides". Journal of Physical Chemistry. 86 (4): 463–467. doi:10.1021/j100393a010.
  3. ^ Baglio JA, Calabrese GS, Kamieniecki E, Kershaw R, Kubiak CP, Ricco AJ, et al. (July 1982). "Characterization of n-Type Semiconducting Tungsten Disulfide Photoanodes in Aqueous and Nonaqueous Electrolyte Solutions Photo-oxidation of Halides with High Efficiency". J. Electrochem. Soc. 129 (7): 1461–1472. Bibcode:1982JElS..129.1461B. doi:10.1149/1.2124184.
  4. ^ Gutiérrez H, Perea-López N, Elías AL, Berkdemir A, Wang B, Lv R, et al. (November 2012). "Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers". Nano Letters. 13 (8): 3447–3454. arXiv:1208.1325. Bibcode:2013NanoL..13.3447G. doi:10.1021/nl3026357. PMID 23194096. S2CID 207597527.
  5. ^ Haynes WM, ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.136. ISBN 1-4398-5511-0.
  6. ^ Cite error: The named reference Tenne1992 was invoked but never defined (see the help page).