الفهرس 
Chapter 1 Introduction and Literature SurveyOnly 14 pages are availabe for public view
 |  | from | 176 |  |  |
| | | from | 176 | | |
Abstract
The influence of Localized surface plasmon resonance (LSPR) of metallic silver nanoparticles Ag NPs on the optical and photo-physical properties of Pyrromethene PM567, Pyrromethene PM597 and Rhodamine R6G laser dyes in liquid and solid milieu was investigated. 2-hydroxyethyl methacrylate (HEMA) was used as homomonomer and homopolymer, while 2-hydroxyethyl methacrylate/methyl methacrylate ( HEMA/MMA) were used as comonomer and copolymer hosts. The silver nanoparticles were synthesized by chemical reduction method. Its size and concentration were determined by high resolution transmission electron microscope (HRTEM), UV/VIS absorption spectroscopy and also, theoretically by using Mie theory. The molar concentration of prepared NPs was C = 3.39 × 10−9 mol/L. The experimental results showed that the optical properties of dyes were remarkably enhanced with optimum concentrations of NPs and dyes. The effect of different nanoparticle concentrations on the optical properties of complex based not only on NPs and dyes concentrations, but also on nature of milieu. where as, [1×10−4mol/L laser dyes: 40%C Ag NPs] and [1 × 10−3 mol/L laser dyes:40%C Ag NPs] were the optimum complexes in case of monomer and polymer hosts respectively. Also, at optimum concentration of laser dyes in polymeric samples (1×10−3 mol/L), the gain values of dyes in HEMA or HEMA/MMA in presence of Ag NPs were better than in case of their absence. Finally, ASE Slope efficiencies and photostabilities of complex samples had higher values in comonomer and copolymer hosts compared with respect to their stabilities in homomonomer and homopolymer hosts respectively.