Morphology and absorption properties of Ag-SiO2 composite films

Abstract

Ag/SiO2multilayers were prepared by RF magnetron sputtering. Via rapid thermal treatment, most of Ag nanoparticles move up to the surface. By changing the layer thickness of Ag and SiO2, Ag particles of different size, density and shape were obtained. The effect of factors such as size, density and shape of the Ag particle, on resonance absorption is also investigated. We change the annealing time according to the diffusion length. Ag particles with a facet parallel to substrate are obtained under adequate annealing time (17.5min). Since the atoms easily transport between particles within the facets, the radius of Ag particle decreases, and tends to a critical size. Correspondingly, the resonance absorption band becomes narrower and blueshift occurrs.

The edges and terrace effect of Ag particles on optical resonance absorption property

“…The annealing temperature and the annealing time were determined by the experiment in our previous work. [12] 3. Results and discussion…”

“…We have shown the process of the rapid thermal treatment in a previous paper. [12] In the present paper, Ag nanoparticles of dissimilar shapes are obtained by changing the thickness of each Ag and SiO 2 layer and the annealing time. By investigating the response absorption, we set up a bridge between the surface state and the optical properties of the Ag nanoparticles.…”

Localized Surface Plasmons Enhanced Ultraviolet Emission of ZnO Films

“…The upper ZnO grains had hexagonal Wurtzitetype crystal and were 𝑐-axis oriented perpendicular to the substrate. The boundaries between the close-by ZnO grains must give a pathway for aggregated Ag nanoparticles to diffuse into the ZnO film, [20,21] and then the interspaces were formed. For nominal 10 nm thickness or less, the Ag film was composed of nanosize islands, [14] the interspaces makes ZnO grow directly on the Si substrate.…”