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| Molybdenum disulfide | |
|---|---|
| Name | Molybdenum disulfide |
| Formula | MoS2 |
| Molar mass | 160.07 g·mol−1 |
| Appearance | grey to black crystalline powder |
| Density | 5.06 g·cm−3 |
| Melting point | decomposes above 1100 °C |
| Solubility | insoluble in water |
Molybdenum disulfide is an inorganic compound composed of molybdenum and sulfur that forms layered crystalline solids widely studied in materials science, condensed matter physics, and surface chemistry. Researchers from institutions such as Massachusetts Institute of Technology, Stanford University, California Institute of Technology, Max Planck Society, and Lawrence Berkeley National Laboratory have investigated its electronic structure, mechanical behavior, and catalytic activity for applications pursued by companies including IBM, Intel, Samsung, Toyota, and BASF. Early mineralogical descriptions appeared alongside work at Harvard University, University of Cambridge, and Imperial College London while modern studies intersect projects at National Institute of Standards and Technology, Argonne National Laboratory, and Oak Ridge National Laboratory.
Molybdenum disulfide occurs naturally as the mineral molybdenite, first described in mineralogical surveys conducted by Geological Society of London and collectors associated with British Museum and later analyzed in metallurgical studies at University of Bonn and École Polytechnique. Its commercial extraction and refinement were developed in concert with mining operations in Colorado, Nevada, and Chile and processed by firms such as Freeport-McMoRan and Anglo American. The compound entered industrial use for lubrication in aerospace projects by Boeing and Lockheed Martin and was characterized spectroscopically in laboratory programs at Royal Society of Chemistry and American Chemical Society conferences.
The crystalline structure of molybdenum disulfide is built from hexagonal layers analogous to structures studied at CERN, University of Oxford, and ETH Zurich, with weak interlayer van der Waals interactions examined in theoretical work by groups at Princeton University and University of Tokyo. Its polymorphs (2H, 1T, 3R) have been resolved using techniques developed at Brookhaven National Laboratory, National Institutes of Health, and the European Synchrotron Radiation Facility; these polymorphs influence properties probed by researchers at Yale University, University of Illinois Urbana-Champaign, and University of California, Berkeley. Mechanical strength, tribological behavior, and thermal stability have been evaluated in studies funded by NASA, DARPA, and European Commission, with comparison to materials investigated at Toyota Research Institute and Nissan Research Center.
Laboratory synthesis routes for molybdenum disulfide include chemical vapor deposition methods pioneered in collaborations between Cornell University and IBM Research, and liquid exfoliation techniques advanced at University of Manchester, University of Cambridge, and National University of Singapore. Industrial-scale production leverages roasting and hydrometallurgical processes used by Glencore and Rio Tinto and chemical synthesis protocols refined in corporate research labs at Dow Chemical and DuPont. Advances in scalable monolayer growth have been reported from joint efforts at Samsung Advanced Institute of Technology, Hitachi, and Toyota Central R&D Labs.
Molybdenum disulfide is employed as a dry lubricant in aerospace and automotive systems developed by General Motors, Rolls-Royce, and Airbus, and as a solid lubricant in military platforms built by BAE Systems and Northrop Grumman. In electronics, it serves as a two-dimensional semiconductor candidate explored by Intel Research, TSMC, and research consortia at IMEC. Energy-related uses include hydrogen evolution reaction catalysts studied in programs supported by Department of Energy and commercialized by energy firms such as Siemens and Shell. It appears in composite materials investigated by 3M and Hitachi Chemical and in battery and supercapacitor research at Panasonic and Tesla.
The catalytic activity of molybdenum disulfide for hydrodesulfurization was developed historically by petrochemical researchers at ExxonMobil and Royal Dutch Shell and remains central to studies at TotalEnergies and Chevron. Edge sites and defect engineering, topics addressed at MIT and Caltech, control reactivity for reactions like hydrogen evolution and hydrodesulfurization examined in collaborations with BP and research centers such as National Renewable Energy Laboratory. Functionalization and heterostructure formation with materials synthesized at Samsung, LG Electronics, and IBM tailor active sites for electrocatalysis assessed in projects funded by European Research Council and National Science Foundation.
Characterization techniques applied to molybdenum disulfide include transmission electron microscopy work at TEM Facility, University of Cambridge, scanning tunneling microscopy pioneered at IBM Zurich Research Laboratory, Raman spectroscopy studies reported in journals associated with Royal Society of Chemistry and American Physical Society, and angle-resolved photoemission spectroscopy at facilities such as Diamond Light Source and Advanced Photon Source. Charge carrier mobility, bandgap tuning, and excitonic effects have been quantified in experiments led by groups at University of California, Los Angeles, University of Washington, and Columbia University, with theory support from Perimeter Institute and Institute of Physics collaborations.
Health and environmental assessments of molybdenum disulfide have been performed by regulatory agencies including Environmental Protection Agency, Occupational Safety and Health Administration, and European Chemicals Agency, with industrial hygiene guidelines referenced by World Health Organization and International Labour Organization. Environmental fate studies in mining regions such as Chile and Nevada involve partnerships with United Nations Environment Programme and national geological surveys like United States Geological Survey and Geological Survey of Canada. Remediation and recycling practices are subjects of projects funded by Horizon Europe and implemented by firms including Veolia and SUEZ.
Category:Transition metal dichalcogenides