Effect of Nanosilver Particles on the Optical and Structural Properties of (PVA-PVP) Films

Abstract

In this work,we study the effect of nanosilver particles on optical and structural properties of polymer matrix consisting of polyvinyl alcohol and polyvinyl pyrrolid-one. The samples of (PVA-PVP-Ag) nanocomposites were prepared by using casting method. The weight percentages of nanosilver are (0, 4, 8 , 12 and 16) wt.%.

The experimental results show that the  absorbance , the absorption coefficient , extinction coefficient , refractive index and dielectric constant (real, imaginary) are increasing with the increasing of concentrations of the (Ag) nanoparticles, and  the energy gap decrease with the increasing of the concentrations of  the (Ag)nanop-articles.

We notice through (FTIR) that the (Ag) nanoparticles at films (PVA-PVP-Ag)  nanocomposites ,lead to restricted of molecular vibrational motion ,also after addition (Ag) nanoparticles ,some polymer chains have been broken and some other chains have been formed instead.

The SEM shows that (Ag) nanoparticles are randomly distributed in the (PVA-PVP) composites films and it is concluded that small agglomerations is formed in these films

Keywords : Optical Properties , FTIR, Polyvinyl alcohol , Polyvinyl Pyrrolidone , (Ag) nanoparticles.