Physical properties of poly (n-vinylcarbazole) doped with silver nanoparticles prepared by laser ablation

F. H. Abd El-kader, N. A. Hakeem, I. S. Elashmawi and A. A. Menazea

National Research Centre

Formation of nanoparticles by laser ablation of solid metals in liquids is one promising method to obtain metal colloids (1). It offers the very essential advantage for biological application to generate NPs, whose surface is not contaminated with residual ions, originating from reactants and the extremely low cost of the processing setup (2).

Systems of poly (n-vinylcarbazole) doped with silver nanoparticles (AgNPs) were ablated by nanosecond laser at different parameters such as; time of irradiation, source power and wavelength. Structural, morphological and optical properties have been investigated using X-ray diffraction (XRD), Transmission electron microscopy (TEM), Ultraviolet-visible (UV-Vis) and Photoluminescence (PL). A correlation between the investigated properties has been discussed. XRD, TEM and PL indicated that the complexation between AgNPs and PVK in the composite system is possible. Only the reflection peak at 2θ = 38° of AgNPs appeared in the composite nanoparticles while the other reflection peaks were destroyed. The nanoparticles shape and size distribution were evaluated from TEM images. TEM evaluated a lower average particle size at long duration time 40 min and short laser wavelength 532 nm together with high laser energy 570 mW. From UV-Visible spectra the values of absorption coefficient, absorption edge and energy tail were calculated. The reduction of band tail value with increasing the ablation parameters confirms the decrease of the disorder in such composite system. The PL and UV – vis. spectra confirm that nanocomposite samples show quantum confinement effect.

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