Preparation and characterization of nanocrystalline Cu2−xSe by a novel solvothermal pathway

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Abstract
A novel solvothermal method has been developed to obtain nanocrystalline Cu 2–x Se at low temperature; CuI and Se were placed at 90 °C for 4 h in an autoclave with ethylenediamine as solvent and the product was characterized by XRD, TEM and XPS. The results revealed that as prepared Cu 2–x Se grains were nearly homogeneously spherical and the average grain size was ca. 18 nm. Ethylenediamine coordinated to Cu + probably plays an important role in the formation of nanocrystalline Cu 2–x Se. It is reasonable to expect that this simple one-step solvothermal route can be extended to obtain other nanocrystalline materials.

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