In this work, the synthesis of copper selenide nanostructures is described, using the microwave and mechanosynthesis technique. In microwave-assisted synthesis, the process was carried out in a modified microwave oven. To this a solution of sodium sulfite was added with selenium powder, this mixture was subjected to microwave radiation at 40 %, thus forming sodium selenosulphate for then add copper acetate maintaining the Cu: Se ratio (1: 1) while undergoing irradiation again, obtaining at the end a black precipitate of copper selenide. The other technique is mecanosynthesis, where copper and selenium powders were ground under inert atmosphere, using a SPEX 8000M mill, obtaining copper selenide. The products were characterized by DR-X, FRX-ED, MEB, EDX, UV-Vis. The results indicate that the Cu2Se, Cu3Se2 and Cu1.8Se phases were formed. Using the equations of Scherrer and Williamson-Hall,...