Structure and Morphology Effects on the Optical Properties of Bimetallic Nanoparticle Films Laser Deposited on a Glass Substrate

Abstract

Moving nanosecond laser system is used for laser-assisted thermodiffusion deposition of metallic nanoparticles from water-based colloidal solutions. The results obtained for both gold and silver nanoparticles show that film morphology strongly depends on laser scanning speed and the number of passages. We show, furthermore, the possibility of producing bimetallic Au:Ag thin films by laser irradiation of the mixed solutions. As a result of several laser scans, granular nanometric films are found to grow with a well-controlled composition, thickness, and morphology. By changing laser scanning parameters, film morphology can be varied from island structures to quasi-periodic arrays. The optical properties of the deposited structures are found to depend on the film composition, thickness, and mean separation between the particles. The transparency spectra of the deposited films are shown to be defined by their morphology.

Nanocomposite Metamaterials Based on Self-assembled Titanium Dioxide Rolls with Embedded Gold Nanoparticles

“…It varied during the fabrication process due to the variation of a mass ratio between the solvent and the dispersed phase. We have taken advantage of the drop-off technique developed for the deposition of metallic NPs 21 . NPs penetrate into a porous crystal matrix of titanium oxide.…”

Measuring the randomness of micro‐ and nanostructure spatial distributions: Effects of scanning electron microscope image processing and analysis

“…[4][5][6] However, much less work has been devoted to the quantitative characterisation of the spatial arrangement of nanostructure positions on surfaces, despite the critical effects it may have on surface and film functionality such as mechanical stability, catalysis, antibacterial effects and optical transparency and reflectance to name just a few. [7][8][9] The quantitative characterisation of spatial patterns has also attracted a lot of interest in other areas of science such as ecology, medical imaging and materials science. [10][11][12] The mathematical methodology enabling the spatial pattern characterisation is usually called point pattern analysis (PPA) and is considered a part of the stochastic geometry.…”

“…In most cases, the focus is on the feature size distribution where several techniques and analysis methods have been employed 4–6 . However, much less work has been devoted to the quantitative characterisation of the spatial arrangement of nanostructure positions on surfaces, despite the critical effects it may have on surface and film functionality such as mechanical stability, catalysis, antibacterial effects and optical transparency and reflectance to name just a few 7–9 …”

Measuring the Randomness of Micro and Nanostructure Spatial Distributions: Effects of Scanning Electron Microscope Image Processing and Analysis

“…In most cases, the focus is on the feature size distribution where several techniques and analysis methods have been employed [4][5][6]. However, much less work has been devoted to the quantitative characterization of the spatial arrangement of nanostructure positions on surfaces, despite the critical effects it may have on surface and film functionality such as mechanical stability, catalysis, antibacterial effects and optical transparency and reflectance to name just a few [7][8][9].…”