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The resultant particles have been characterized by Xray diffraction, size distribution analysis and SEM, TEM observation. Welldispersed nanocopper particles with c. a. 30 nm in diameter were obtained from the water/organic solution containin Cu2+ ion, glucose as the first reductant, ascorbic acid as the second reductant. In this process, oleic acid acted as both a phasetransfer agent and a particle protector coordinating their carboxyl end groups on the new generated copper particles surface, the hydrophobic carbon tails of the oleic acids were pointed outwards from the surface of the synthesized particles. This organic film seems to play an important role for prevent the new generated copperparticles from oxidation. In addition, this process also adopting twostep reduction method can lead pulsively disconnect nucleation and nucleation growth, and weaken conventionnal eruptible nucleation. By controlling the first reduction product’s size, this process is more convenient for delaying the nuclei processes and for controlling the ultimate copper particles size.IntroductionIn contrast with noble metals such as Ag and Au, pure metallic copper particles usuall y cannot be obtained via the reduction of simple copper salts such as copper chloride or copper sulfate in aqueous solution, because the reduction tends to stop at the Cu2O stage due to the presence of a large number of oxygenous water molecules, unless other reagents carrying functional groups that can form plexes with copper ions are present or using soluble surfactants as capping agents to prepare copper particles in aqueous solutions. However, despite zero valent copper initially forming in the solvent ultimately, it has been found that the zero valent copper can easily transform into oxides in those solvents with high dipole moments under ambient conditions [1]. The refore, the traditional fabrication methods [2–8] were usually performed in nonaque ous media, at low precursor concentration, and under an inert atmosphere to avoid oxidation, which greatly hinder them be applied in massproduction.We report here the results on the synthesis and characterization of copper particles of specific size, shape, and narrow size distribution using a kind of new extractiontwo stepreduction method. In this method, cupric ions in aqueous solution are firstly extra cted into oleic acid. Then, the extracted cupric ions are reduced into cuprous oxide and metallic copper by glucose and ascorbic acid respectively. Oleic acid acts as both an ext