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Metal nanoparticles have recently attracted attention due to their unique electrical, magnetical and optical properties. Thus, synthesis of these nanoparticles by a simple and low cost method is very important. In this work, Pd nanoparticles were synthesized with narrow size distribution by loading metal salt (Pd(OAc)2) into the polymeric matrix (PEG) as reducing agent and stabilizer. Also, the effect of metal salt concentration and PEG molecular weight on the conversion of Pd2+ to nano Pd0 and synthesized palladium nanoparticles morphology were investigated by UV-vis spectroscopy, X-ray diffraction and transmission electron microscope. The UV results confirmed the significant effect of PEG molecular weight on the reduction reactivity of polymeric matrix. Increasing of PEG molecular weight results in the rapid reduction of Pd(II) to Pd nanoparticles, which can be due to the high reducing reactivity of high molecular weight PEG. Also, the obtained XRD resuls showed that the intensity of palladium peaks increases at high Pd(OAc)2 concentrations. The obtained cluster size of palladium nanoparticles using the Scherrer formula showed that by increasing palladium acetate concentration, the synthesized nanoparticles size increases significantly. In addition, TEM micrographs confirmed this trend of salt concentration effect on the synthesized Pd nanoparticles size. |