A novel solid-liquid route for the preparation of Cu_3Se_2 and Ag_2Se nanocrystals

摘要

Cu_3Se_2 and Ag_2Se nanocrystals have been synthesized with Se as the precursor in aqueous solutions under photo-irradiation at room temperature. The obtained products were analyzed through X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that the tetragonal phase of Cu_3Se_2 with nearly spherical grains and the orthorhombic phase of Ag_2Se with nanoscale dendrite were formed. The experiments also confirmed that photoirradiation and Na_2SO_3 played important roles in the formation of Cu_3Se_2 and Ag_2Se nanocrystals. The formation mechanism of Cu_3Se_2 and Ag_2Se nanocrystals was investigated in detail.