Copper selenide is an inorganic binary compound between copper and selenium. The chemical formula depends on the ratio between the two elements, such as CuSe or Cu2Se.
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IUPAC name
Copper Selenide
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ECHA InfoCard | 100.039.799 |
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Properties | |
Cu2Se | |
Molar mass | 206.063 g·mol−1 |
Appearance | Dark blue, black |
Density | 6.84 g/mL[1] |
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H201, H331, H373, H410 | |
P260, P261, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The crystalline structure and electronic behavior is determined by its elemental composition.[2] Stoichiometric copper selenide is a zero bandgap material with metal-like behavior.[3] Copper-deficient Cu2-xSe (non-stoichiometric) is an intrinsic p-type semiconductor with direct and indirect bandgap energies in the range of 2.1–2.3 eV and 1.2–1.4 eV, respectively.[4] It is frequently grown as nanoparticles or other nanostructures.[5][6][7]
Copper selenide is produced in-situ to form a protective black coating on iron or steel parts in some cold-bluing processes.[8] Bluing solutions that operate in this manner will typically be labeled as containing selenous acid or selenium dioxide.[9][10] It has also been investigated for use in the treatment of colon cancer.[6]
Copper selenides are the most common selenium minerals. CuSe is known in mineralogy as klockmannite,[11] while Cu2Se occurs as two polymorphs, berzelianite[12] (isometric, more common) and bellidoite (tetragonal). There are more natural Cu selenides to date, including umangite, Cu3Se2 and athabascaite, Cu5Se4.[13]