Silver nanoparticles layers were fabricated using spin coating and UV irradiation of polyvinylpyrrolidone/Ag nanoparticle composite thin films on glass. The spontaneous aggregation of Ag nanoparticles was accompanied with the absorption peak due to surface plasmon resonance (SPR) at 410 nm. Longer irradiation leads to partial coalescence of the nanoparticles with a corresponding shift of SPR towards longer wavelengths. The dependence of the shape, size, and absorbance spectra of these aggregates on UV irradiation time and silver salts concentration were investigated by UV-VIS spectroscopy, XRD and AFM.

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