Effect of Non-Alloyed Au/Cr Bilayer Thin Films Deposited on Glass Substrate by Slow-Rate of Electron-Beam Evaporation Method

Abstract

Gold nanoparticles were fabricated by slow rate of e-beam evaporation method. 1 and 5 nm thicknesses of Au-thin films were deposited on Cr-thin film to glass substrate at the rate of 0.1 Å/s. Structurally, 1 nm thickness of Au thin film results broader Au-peaks observed by X-ray diffraction measurement when compared with 5 nm thickness of Au thin-film deposited on Cr/glass substrate. Cr-elements were observed for all as-deposited (virgin) samples by energy dispersive X-ray analysis. Gold nanoparticles were also identified by using atomic force microscopy measurements. UV-visible spectroscopy results less percentage of transmittance with higher reflectance observed on 5 nm thick of Au thin-film samples. Owing to the surface plasmon resonance effect, 5 nm of Au thin films have stronger UV-absorption in the visible region.