Different time's Nd:YAG laser-irradiated PVA/Ag nanocomposites: structural, optical, and electrical characterization

Composite films of polyvinyl alcohol (PVA)/Silver nanoparticles (AgNPs) were synthesized via casting method. The presence of AgNPs in PVA was approved by an apparition of Surface Plasmon Resonance (SPR) around 427 nm of the composite absorption spectra. The nanocomposite films were irradiated at different times (5, 10, and 15 min) pulsed Nd:YAG laser. The integral intensity of diffracted X-ray photons from films has been increased noticeably after the doping process denotes increasing in the ordering character of the PVA/Ag nanocomposite irradiated to different time's laser, which can be assigned to the reduction that has been induced by laser. Observations of IR spectra indicated that laser enhances the structural modifications between the chains in PVA and the silver nanoparticles with further increasing laser irradiation time. The observed increase in refractive index (n) and the decreasing in the optical band gap of PVA/Ag nanocomposite films after irradiated to the laser with different times (5, 10, and 15 min) comparing with pure PVA suggesting its possibility to using optical device applications. The behavior of ɛ′ and ɛ″ are gradually decreased with the increase of the frequency. The value of ɛ′ and ɛ″ are decreases due to the contribution of interfacial polarization effect in dielectric permittivity. The relation between M’ and M″ depicts the formation of a semicircle arc indicating the presence of broad relaxation processes.