Optical Properties of Al2O3-Ni-Al Nano-Composite Films

Abstract

Extended Abstract In the nature, there are a variety of organisms and minerals that produce colors as a result of nanostructures that interacting with light. This phenomenon is called structural colors. Structural colors are based on several basic optical effects, including thin layer interference, diffraction, and light scattering. [1] Compared to pigmented colors, structural colors have many useful properties, including iridescence, high reflectance, and polarization. These optical properties have been applied in many fields such as color displays, decorations, anti-counterfeiting and fluid sensors. [2] Among the many structural color studies, we have examined the optical properties of the porous alumina film formed using Aluminium Anodic Oxidation(AAO). Specifically, their studies were reported that porous thin films formed by AAO processes produces bright colors in the visible range. [3] In addition, fabricated alumina – nickel film by AAO process and electroplating has been reported to exhibit structural color.[2] In this study, to improve the nanostructure color using the metal light scattering effect. Aluminum was deposited by sputtering on the nanocomposite film fabricated by the AAO process and the electroplating process. The AAO process was performed by applying a voltage of 20 V in 0.1 M sulfuric acid electrolyte. The pore diameter of the formed porous alumina was 25 nm, the depth was formed to 600 nm. After the AAO process, nickel thickness of 50