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titanium selenide is a promising material for advanced electronics beyond graphene. It has high mobility, high conductivity, and a wide range of electronic properties that can be tuned by the choice of substitution partners. This material can be fabricated into thin, atomically thin films with a wide range of properties. Its synthesis is based on liquid chemical exfoliation, which can produce TiSe2 nanosheets down to single-layer thicknesses.
We report the synthesis of a new titanium selenide, crystalline Ti5Se4. The crystal structure is refined against x-ray powder diffraction data using the Rietveld method and it consists of separated MX4 (M = transition metal, X = metalloid) chains. This is the first time that such a phase has been observed in a titanium selenide.
The atomistic structures of both the (1 x 1) normal and (2 x 2) CDW phases are obtained from reflection high-energy electron diffraction patterns, core-level absorption edges and DFT calculations. Angle-resolved photoemission spectroscopy measurements reveal that the CDW phase has a small bandgap that grows larger with temperature T below TC in conjunction with the emergence of (2 x 2) zone ordering. The calculated band features near the Fermi level are consistent with a mean-field theory description of the CDW phase.
Titanium is a nonmetallic element that is found in trace amounts in nature as pure element and in mineral compounds such as titanium dioxide, titanium sulfide and titanium telluride. Elemental titanium has low acute systemic toxicity and is physiologically inert. However, prolonged inhalation of titanium dust or fumes may cause dermatitis. Chronic exposure can also lead to respiratory problems such as inflammation, a garlic-like breath odor and gastrointestinal upsets. (Sax, Dangerous Properties of Industrial Materials, eighth edition).