In the present work, Poly (vinyl alcohol)-silver (PVA-Ag) nanocomposite films with thickness 0.18 mm, constant silver content (0.4 wt. %) and different time of reactions (0.1, 3, 5, 7, 9 h) were prepared by the chemical reduction (in-situ) method. Structural and optical properties of PVA-Ag nanocomposite were studied by Uv-vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscope (AFM) and photoluminescence (PL) spectroscopy. Optical absorption studies showed an additional peak at 427 nm for different films and a peak at 210 nm for undoped PVA film. It was found that the root mean square (RMS) roughness, the average diameter of Ag nanoparticles and optical energy gap decrease, while PL intensity, the conductivity, and the absorbed intensity at 427 nm increase as the time of reaction is increased. XRD results showed the formation of silver nanoparticles with (FCC) phase in the PVA matrix. The dielectric constant (ε') value decreased with the increasing the time of reaction. The conductivity and dielectric loss were increased with an increasing the time of reaction. Poole - Frankel emission is the prevailing transport mechanism for all samples.
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