Effect of Ag nanoparticles on R6G laser dye hosted by PMMA polymerized by plasma jet

Abstract EN

This work aim to prepare Ag/R6G/PMMA nanocomposite thin films by In-situ plasma polymerization and study the changes in the optical properties of fluorophore due to the presence of Ag nanoparticles structures in the vicinity of the R6G laser dye.

The concentrations of R6G dye/MMA used are: 10-4M solutions were prepared by dissolving the required quantity of the R6G dye in MMAMonomer.

Then Silver nanoparticles with 50 average particles size were mixed with MMAmonomer with concentration of 0.3, 0.5, 0.7wt% to get R6G silver/MMA in liquid phase.

The films were deposited on glass substrates by dielectric barrier discharge plasma jet.

The Ag/R6G/PMMA nanocomposite thin films were characterization by UV-Visible absorption spectra by using a double beam UV-Vis-NIR Spectrophotometer and fluorescence Spectrophotometer.

The thin films surface morphological analysis is carried out by employing an AFM and SEM.

the structure analysis are achieved by X-ray diffraction.

The thickness of the films was measured by optical interferometric method.

AFM analysis shows that the surface roughness of plasma polymerized pure PMMA thin films was 2.7 nm and for (10-4 R6G + 0.7wt% Ag)Ag/R6G/PMMA thin films was 4.16 nm.

The SEM images were indicates that Ag nanoparticles (NPs) disperse in the PMMA matrix with uniform distribution and formed mostly spherical NPs and slightly agglomerate.

Also the silver nanoparticles with 0.7wt% concentration enhances the absorption process by 2.3 times and the fluorescence by 1.7 times.

it can be conclude, that the addition of low concentrations of silver nanoparticles to the PMMA/ R6G matrix was changing the optical properties of the prepared nanocomposite thin films.