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Copper-containing nanoparticles were synthesized by using a polyol method. Ethylene glycol (EG), which is a typical polyol, was used as a reductant and a solvent. Cu(OAc)_2·H_2O and polyvinylpyrrolido...ne (PVP) were employed as a reagent and a protecting agent, respectively. The product nanoparticles obtained at each reaction stage were characterized by using transmission electron microscopic (TEM), TEM-energy dispersed X-ray spectroscopic (EDS), scanning electron microscopic (SEM), X-ray diffraction (XRD), and ultraviolet (UV)-visible (Vis) extinction spectroscopic measurements. Results showed that Cu_2O particles with a mixture of various morphologies were initially formed at 175℃. They consisted of aggregates of small nanoparticles in most cases. After further heating at 175℃ for 15 min, Cu_2O particles were reduced to Cu nanoparticles rapidly. After heating at 175℃ for 60 min, monodispersed spherical Cu nanoparticles with an average diameter of about 200 nm were finally obtained. UV-Vis extinction spectra suggested that Cu_2O particle solution was stable more than 10 days, whereas complete precipitation occurred for Cu nanoparticle solution after 3 days due to oxidation.続きを見る
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