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Silver/poly(N-vinyl-2-pyrrolidone) (Ag/PVP) nanocomposites were obtained by  electrochemical reduction of Ag+ ions at a constant voltage, by the in situ  synthesis of silver nanoparticles inside poly(N-vinyl-2-pyrrolidone) matrix,  previously crosslinked by γ-irradiation. Optimal values of synthesis  parameters were investigated: the composition of the solution for swelling of  PVP hydrogel, implementation time and applied voltage. Ag/PVP nanocomposites  were characterized by UV-visible spectroscopy, and IR spectroscopy.  UV-visible spectroscopy results shown that the reduction of silver ions was  more efficient when the more conductive solution for swelling of PVP hydrogel  was used, i.e. the solution containing 3.9 mM AgNO3 with 0.1 M KNO3. Also, it  was shown that the concentration of the reduced silver increases with the  increase in implementation time and applied voltage, up to the values of 4  min, and 200 V, respectively. The Ag nanoparticle size was estimated to be 25  nm, by comparison of the experimental results of UV-vis spectroscopy with the  theoretical predictions obtained by the calculations in “MiePlot v.3.4”  computer program, having the algorithm based on Mie scattering from a sphere.  The results of FTIR spectroscopy have shown that Ag nanoparticles are mainly  bonded to PVP by coordination bondages between Ag nanoparticles and N from  the pyrrolidone ring of PVP

Silver/poly(N-vinyl-2-pyrrolidone) nanocomposites obtained by the electrochemical synthesis