▎ 摘　　要

Nanocomposites consisting of polyvinylidene fluoride [PVDF] and reduced graphene oxide [RGO] were fabricated by solution casting method. TEM image of the RGO exhibits paper-like structure with single or very thin layers. FTIR and XRD revealed that the structure of PVDF is strongly affected upon the addition of RGO and the beta-phase fraction was found to increase on the expense of alpha-phase. DSC data indicates that increasing the RGO content decreases the nanocomposites crystallinity. Optical properties were investigated in the wavelength range (200-800 nm). The effect of RGO content on the optical band gap was studied. Doppler broadening parameters (S and W) of 511 keV annihilation radiations were measured. A reasonable correlation was found between S-parameter, the crystallinity and the optical band gap. Doppler broadening parameters provide an explanation of the positronium formation as well as the type and concentration of defects in the investigated composites. (C) 2018 Elsevier B.V. All rights reserved.