Silver nanoparticles embedded Polyvinyl alcohol (PVA) nanocomposites samples were prepared by in‒situ chemical reduction of silver nitrate (AgNO3) in an aqueous solution of PVA. The prepared nanocomposite films were exposed to ultraviolet (UV) radiations for different times at room temperature. The UV irradiation induced modification has been studied through optical spectroscopy and electrical measurements. The appearance of Surface Plasmon Resonance (SPR) band at 425 nm in the UV-Visible absorption spectra of PVA/Ag nanocomposite confirms the presence of the silver nanoparticles in PVA matrix. The optical energy gap values were found to reduce from 4.92 eV in pure PVA to 4.61 eV for PVA/Ag nanocomposites without UV irradiation, which further reduces to 4.40 eV after UV irradiation for 240 minutes. Such a reduction in optical energy gap may be linked to the increased conjugation in PVA matrix as an effect of embedding of silver nanoparticles. The value of conductivity increases from 4.16 × 10‒9 S/m for pure PVA to 3.64 × 10‒8 S/m for PVA/Ag nanocomposites which further enhances with the increase of UV exposure.

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