Copper dinitrate is primarily used as a precursor in the synthesis of other copper-containing compounds and materials. It serves as a catalyst or reagent in various organic transformations, including oxidation reactions and coupling processes. In materials science, it is employed in the preparation of copper oxide thin films and nanoparticles, which have applications in electronics, sensors, and solar cells. It is also used in electroplating baths to deposit copper coatings on surfaces, enhancing conductivity and corrosion resistance. Additionally, copper dinitrate finds use in textile dyeing as a mordant to fix colors and in the production of pigments and fungicides.