Optical and Structural Properties of Silver Nanoparticles Embedded in Indium Oxide Films

Abstract

Nanoparticles of silver-embedded indium oxide thin¯lms have been prepared on glass and silicon substrates. Silver concentration were 3 wt.% and 5 wt.% as measured by X-ray°uo-rescence. X-ray di®raction reveals that indium oxide of these samples remains amorphous even after pre-annealing at 400 C. The optical absorption of the samples manifests the surface plasmon resonance (SPR) phenomena, which varies with Ag content. The Ag nanoparticles radius was estimated with Mie classical theory by using the SPR data analysis. The nonlinear optical properties of¯lms on glass substrate were investigated using z-scan technique. Under cw excitation the¯lms exhibit large reverse saturation absorption and negative nonlinearities. The real and imaginary parts of third order susceptibility of the samples were measured and the imaginary part which arise from the change in absorption is found to be dominant.

In vitro silver ion release kinetics from nanosilver/poly(vinyl alcohol) hydrogels synthesized by gamma irradiation

“…When the sizes of the metal nanoparticles were smaller than the λ of incident light, their average radius ( r ) values could be estimated from the surface plasmon resonance band with the following expression: where v f is the Fermi velocity for Ag (1.39 × 10 8 m/s) and Δω 1/2 is the full width at half‐maximum in units of angular frequency for the surface plasmon resonance band of the nanoparticles. This relation assumes that the particles are spherical, without any interparticle interaction …”