Investigation of optical and anti-corrosive properties of reactively sputtered vanadium oxynitride thin films
By Hirpara, Jignesh; Chandra, Ramesh
Published in Materials Today: Proceedings
2021
Abstract
In the present study, synthesis of Vanadium oxynitride thin films on various substrates are done using reactive magnetron sputtering technique. Physical and chemical properties were studied through XRD, FE-SEM and AFM methods. Optical and anti-corrosive properties were investigated by UV–Vis spectroscopy and potentiodynamic polarization (Tafel). Electrochemical impedance spectroscopy (EIS) methods were used to study the interaction of coating and 3.5 wt% NaCl solution. Reactively sputtered vanadium oxynitride films have good uniformity, low roughness i.e. below 50 nm and thickness of 250 nm in 30 min deposition. The study reveals that the vanadium oxynitride coating has an average transmittance of 42% in the wavelength range from 550 nm to 800 nm. The compound exhibited an energy band gap of 2.13 eV. The coatings show good anticorrosive nature by reducing the corrosion current by 6 times due to its passivating behavior.