Optimization of different types of nano-structures to be used for catalysis, optical, and biological applications

The silver nanoparticles (Ag NPs) were prepared by different chemical methods. Moreover, due to the limitation of these chemical methods to control the particle size, we used the laser to photofragment the large size nanoparticles into smaller ones. FurthSilver nanoparticles (Ag NPs) were prepared by the normal chemical method and doped with polyvinyl alcohol (PVA). The electrical and optical properties were studied. The band intensities of the FT-Raman spectra were found to increase by increasing the amoSurface-enhanced Raman scattering (SERS) spectra of sodium benzoate (SB) adsorbed on Ag NPs were recorded as a function of particle size of Ag NPs. The carboxylic group bands were enhanced as the particle size decreases due to the chemisorption. The SB baRaipo nucleic acid (RNA) bases have a great importance in the biological and genetics applications. The surface-enhanced Raman scattering was used to study the orientation and adsorption structure of RNA bases adsorbed on the surface of silver nanowires (Metal Selenides nanocrystallites (ZnSe, CdSe, and PbSe) of different sizes were also prepared in polyvinyl alcohol (PVA) photopolymer films. Particle sizes were optimized by variation the metal to Se ions ratio up to 16:1 as well as doping in PVA. X-ray dThe SiO2 NPs, SiO2 NPs coated with Au NPs and Ag NPs, SiO2 NPs coated with Ag NPs, SiO2 NPs coated with Au NPs, Ag+ doped SiO2 NPs, and Au3+ doped SiO2 NPs photocatalyst were used for the photodegradation of methyl red. The kinetic and mechanism of the ph