Optical absorption behaviour of platinum core-silica shell nanoparticle layer and its influence on the reflection spectra of a multi-layer coating system in the visible spectrum range

Abstract

Platinum core-silica shell nanoparticles (Pt@SiO2) have been applied to the outermost layer of a three-layer film structure to yield a Pt@SiO2/SiO2/ITO (indium tin oxide) coating on a glass substrate. Optical properties of the three-layer film have been investigated in the visible spectrum regime. The absorption of visible light by the Pt core-SiO2 shell layer was higher in low- and high-wavelength regimes while it was minimal at a mid-visible light range, about 550 nm. This characteristic absorption of the core-shell layer resulted in a broad-band anti-reflectance behaviour of the multi-layer coating system in the entire visible light regime. Transmittance of the three-layer coating-glass system was in the range between 80% and 85% and thus the application of the platinum core-silica shell nanoparticle layer with such absorption characteristics is shown to provide flexibility of ways to achieve a broad-band anti-reflectance and transmittance of a multi-layer coating system.