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| titanium disulfide | |
|---|---|
| Name | Titanium disulfide |
| Formula | TiS2 |
| Molar mass | 120.15 g·mol−1 |
| Appearance | Dark gray to black crystalline solid |
| Density | 3.27 g·cm−3 |
| Melting point | Decomposes before melting |
| Crystal system | Hexagonal (CdI2-type) |
| Space group | P-3m1 |
titanium disulfide Titanium disulfide is an inorganic compound with the formula TiS2, known for its layered structure and semiconducting behavior. It occupies a place in materials science research alongside Graphene and MoS2 in studies of two-dimensional materials and has been investigated for roles in battery electrodes, catalysis, and intercalation chemistry associated with groups such as Sony and academic laboratories at institutions like MIT and Stanford University. Work on TiS2 traces through industrial research by firms like Dow Chemical Company and research programs supported by agencies such as the National Science Foundation.
TiS2 belongs to the family of transition metal dichalcogenides historically studied by chemists linked to Linus Pauling-era solid state chemistry and later by research teams at Bell Labs and IBM Research. The compound attracted attention during the development of lithium-based energy storage by teams at Exxon and Basf and features in reviews appearing in journals associated with publishers like Nature Publishing Group and Elsevier. Research networks include collaborations among groups at University of Cambridge (UK), ETH Zurich, and Tsinghua University.
Titanium disulfide crystallizes in a layered CdI2-type structure with hexagonal symmetry; each layer comprises edge-sharing TiS6 octahedra similar to structures studied for Ruthenium dioxide and Vanadium disulfide. Interlayer spacing allows intercalation of guest species as seen in classic studies by M. S. Whittingham and follow-on work by John Goodenough and Stanley Whittingham (chemist). Electronic band structure calculations by groups at California Institute of Technology and Argonne National Laboratory relate TiS2 to semimetals and narrow-gap semiconductors investigated alongside Boron nitride and Black phosphorus. Its anisotropic properties have made it a template in theoretical studies performed by researchers at Max Planck Society and Oak Ridge National Laboratory.
Bulk TiS2 is commonly prepared by direct combination of elements, a method practiced in industrial labs like Johnson Matthey and academic groups at University of California, Berkeley. Chemical vapor transport using agents such as iodine follows procedures refined in the inorganic chemistry tradition of researchers at University of Oxford and Harvard University. Alternative syntheses include solvothermal and hydrothermal methods developed in research programs at Seoul National University and Waseda University, and thin-film deposition techniques such as molecular beam epitaxy and chemical vapor deposition adapted by teams at University of Illinois Urbana-Champaign and Korea Advanced Institute of Science and Technology.
TiS2 exhibits intercalation chemistry with alkali metals including lithium and sodium, linking its behavior to breakthroughs by Akira Yoshino and Stanley Whittingham in battery development. It undergoes oxidative degradation under strong oxidants studied by laboratories at University of Tokyo and Shanghai Jiao Tong University. TiS2 reacts with halogens and strong acids in manners reported in inorganic syntheses compiled by editors at Wiley and Royal Society of Chemistry. Stability under ambient conditions is moderate; researchers at Los Alamos National Laboratory and Cambridge (Massachusetts) have characterized passivation phenomena similar to those observed in studies of Titanium dioxide and Molybdenum disulfide.
Characterization techniques applied to TiS2 include X-ray diffraction pioneered by William Henry Bragg and William Lawrence Bragg, electron microscopy developed at Max Planck Institute for Solid State Research, Raman spectroscopy used by groups at Columbia University, and photoelectron spectroscopy from facilities such as SLAC National Accelerator Laboratory. Transport measurements have been carried out in laboratories affiliated with Bell Labs and IBM to probe conductivity, Hall effect, and thermoelectric performance in contexts explored by Nobel Prize in Physics-level researchers. Optical properties place TiS2 in comparative studies with Transition metal dichalcogenide semiconductors covered in reviews by American Chemical Society journals.
TiS2 has been evaluated as a cathode material in rechargeable batteries in early work by Sony and later in initiatives at Argonne National Laboratory and Toyota; these studies intersect with lithium-ion technology developed by Akira Yoshino and companies like Panasonic. Other applications include thermoelectric devices examined by teams at ETH Zurich and University of Cambridge (UK), and catalysts for hydrogen evolution investigated by researchers at Stanford University and Imperial College London. Its suitability for intercalation electrodes motivated industrial interest from firms such as ExxonMobil and 3M during exploratory programs.
Handling of TiS2 follows protocols similar to those for inorganic sulfides outlined by occupational safety agencies like the Occupational Safety and Health Administration and environmental monitoring standards promulgated by the Environmental Protection Agency. Disposal and life-cycle analysis have been discussed in sustainability studies at Massachusetts Institute of Technology and University of California, Santa Barbara, considering sulfur release pathways featured in assessments by United Nations Environment Programme. Research into recycling and reuse of TiS2-containing electrodes has involved collaborations among European Commission funded consortia and industry partners such as Umicore.
Category:Transition metal dichalcogenides