A series of brown-colored crystalline copper complexes were synthesized through simple chemical reactions. Both solvothermal and hydrothermal techniques were employed for the formation of nanoparticles. Ethylene diamine and octylamine, along with PEG, were utilized as solvents. All of the copper sulfide nanoparticles obtained exhibited a hexagonal morphology. Nanoparticles synthesized with octylamine as the solvent were smaller and exhibited superior crystallinity compared to those prepared with ethylene diamine. The particle size, morphology, phase purity, crystallinity, and elemental composition were analyzed using UV-Vis spectroscopy, X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDS), and Scanning Electron Microscopy (SEM). These nanoparticles were further tested as catalysts and photo catalysts in dye degradation experiments.