Tungsten diselenide is a black or gray solid powder with a molar mass of 341.76g/mol and a hexagonal layered crystal structure with a density of 9.32g/cm3 and poor thermal conductivity. Its thermal conductivity is about one hundred thousandth of that of diamonds with better thermal conductivity. In addition, the bandgap of tungsten selenide (WSe2) is between wide-gap semiconductors and zero-gap graphene, and it has excellent electrical and optical properties and high quantum yield.
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