7 b represent X-ray pattern of pure PVP and PVP/Au, there was a noticeable change in the intensity of XRD peaks after doping Gold nanoparticles, the intensity of peaks at 2θ = 10.9°,2θ = 21.4°was decreased after adding Au nanoparticles and no characteristic peak appear for Gold nanoparticles which refer to completely interaction between PVP and Gold nanoparticles