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Synthesis of copper nanoparticles was achieved by reduction of copper sulfate solution using sodium hypophosphite (NaH2PO2). The nanoparticles are characterized by using SEM and XRD techniques. The XRD analysis and theoretic calculation indicate that the products have a fcc structure, and the size of crystallite is about 20 nm. Different solvents have been used to produce copper particles with different shapes, and the size of the particles can be controlled by varying reaction condition.doi:10.4028/www.scientific.net/amr.627.804 fatcat:bv5qjpdc3bdkva27x3t237gyqe