Abstract: The invention relates to copper nanoparticles and to a method for producing them, including the following steps: dissolving at least one copper salt, oxide or hydroxide in distilled water in a container; dissolving at least one stabilizer in distilled water in a container; mixing the two solutions in a reactor; adding a primary complexing agent; adding an alkali; adding an anti-foaming agent; adding at least one reducing agent, stopping the reaction by cooling to a temperature reaction between 0° C. and 25° C. while maintaining the stirring; adding at least one antioxidant; adding at least one secondary complexing agent; and maturing and washing the mixture; The invention also relates to the use of copper nanoparticles.