Copper(I) selenide
Chemical compound
From Wikipedia, the free encyclopedia
Copper(I) selenide is an inorganic binary compound between copper and selenium, with the chemical formula Cu2Se.[2]
| Names | |
|---|---|
| IUPAC name
Copper(I) selenide | |
| Other names
Cuprous selenide, dicopper selenide | |
| Identifiers | |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.039.799 |
| EC Number |
|
PubChem CID |
|
| UNII | |
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| Cu2Se | |
| Molar mass | 206.063 g·mol−1 |
| Appearance | Dark blue, black |
| Density | 6.84 g/mL[1] |
| Hazards | |
| GHS labelling: | |
   | |
| Danger | |
| H201, H331, H373, H410 | |
| P260, P264, P270, P271, P273, P301+P310, P304+P340, P311, P314, P321, P330, P391, P403+P233, P405, P501 | |
| Related compounds | |
Other cations |
|
Related compounds |
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Properties
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]
Occurrence
Copper selenides are the most common selenium minerals.[citation needed] Cu2Se occurs as two polymorphs: berzelianite[8] (isometric, more common) and bellidoite (tetragonal). Other copper selenide minerals include umangite, Cu3Se2 and athabascaite, Cu5Se4.[9]
Uses
Copper(I) selenide is produced in situ to form a protective black coating on iron or steel parts in some cold-bluing processes.[10] Bluing solutions that operate in this manner will typically be labeled as containing selenous acid or selenium dioxide.[11][12] It has also been investigated for use in the treatment of colon cancer.[6]