Synthesis of Highly Mono-dispersed AgNPs within PVP Matrix via Gamma Irradiation

Document Type : Original Article

Abstract

 GAMMA-RADIATION synthesized silver/poly(vinyl pyrro-lidone) (Ag/PVP) nanocomposite films were prepared using PVP as a stabilizer. The prepared films were characterized by Ultra Violet/ Visible (UV/vis) spectroscopy, Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD) and Fourier Transform Infera Red (FTIR). The UV/vis analysis showed the appearance of surface plasmon resonance peaks at 403-406 nm confirming the formation of silver nanoparticles (AgNPs). The TEM images confirmed the formation of a highly mono-disperse and narrow size distributed AgNPs and the particle size was increased by increasing Ag+ ion molar concentration. The XRD patterns exhibit four diffraction peaks revealed that the AgNPs are formed within PVP matrix and its crystal structure is face centre cubic (fcc) structure. The calculated values of crystalline particle size (D,nm) showed that both AgNO3 molar concentration and irradiation dose are determining factors in controlling the particle size of AgNPs. FTIR spectra illustrate that the formation Ag/ PVP nano-composites leads to change in peak position, peak shape and peak intensity of the characteristic peaks. The differences in the Ag/PVP nanocomposite spectrum compared to that of pure PVP indicated the formation of coordination bonding between nitrogen and AgNPs, as well as between oxygen and AgNPs.

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