تأثير جسيمات الفضة النانوية على الخصائص التركيبية والبصرية لغشاء PVA) ) المطعم بصبغة المثيلين بلو

Effect of Ag nanoparticles on the structural and optical properties of the PVA film doped by Methylene blue dye

Abstract

In this work, the effect of silver nanoparticles (AgNPs) which were synthesized by pulsed laser ablation in liquid (PLAL) using Ndmium Yag-1064 nm laser was investigated after adding to a mixture of organic methylene blue dye solution with polyvinyl alcohol polymer (MB/PVA) solutions. Methylene blue (MB) and polyvinyl alcohol (PVA) dye were prepared using distilled water as a solvent with different concentrations (1×10-4, 3×10-4, 5×10-4, 7×10-4) M. The absorption and fluorescence spectra of the prepared solutions were studied before and after adding particles Silver nanoparticles (AgNPs) in the UV-visible regions. It was observed that the maximum absorbance is achieved at a concentration of methylene dye at (7×10-4) M and a wavelength of 660 nm. On the other hand, at a constant concentration of AgNPs, and using a range of MB concentrations, the absorption intensity of the MB/PVA/AgNps mixture was obtained due to the surface plasmon resonance beam-width. Some of the linear optical properties were studied by means of absorption spectra measurements of the prepared samples before and after adding the nanomaterial, and the properties include spectra of transmittance (T), reflectivity (R), linear absorption coefficients (α◦), linear refractive index ( no), and the extinction coefficient (K). It was observed that the values of the optical constants increase in the presence of silver particles indicating the effect of the nanomaterial. Moreover, the structural properties of the composite film (MB/PVA/AgNps) prepared by the casting method were studied by AFM and XRD measurements at angles 37, 041, 64 and 526. It was also observed through the structural study increase in the crystallite size, and a decrease in the average roughness by changing the concentration of the nanomaterial in the films. This is a promising indication of the effect of silver nanoparticles due to their high surface area.