Structure, Characteristics and Corrosion Behaviour of Gold Nanocoating Thin Film for Biomedical Applications

Abstract

Nanocoatings thin films are layers deposited to improve required properties and corrosion resistance as a major objective for materials that are used for various biomedical applications such as biosensors. In this study, Gold (Au) thin films with 50 nm and 100 nm have been synthesized on Ni-Cr-Mo alloys by magnetron sputtering deposition technique. X-Ray diffraction (XRD), Atomic Force Microscopy (AFM), and Energy-dispersive X-Ray spectroscopy /Scanning Electron Microscopy (EDS/SEM ) have been used to distinguish the surfaces morphology. The results showed that there is no defects or micro-cracks with a uniform and homogenous film. It has spherical nanoparticles diameter morphology with 200-400 nm shaped to fine aggregation. The roughness average (Ra) decreased from 3.91 nm for 50 nm films to 3.70 nm for 100nm films with FCC crystal structure (111) for gold thin films. In vivo, after 50 nm and 100 nm nanocoated thin film by gold, a significant improvement in the localized corrosion resistance has been obtained in artificial saliva corrosive media at 37 °C compared with the uncoated surface.

Evaluation of the biocompability and corrosion activity of resorbable CaMgZnYbBAu alloys

“…They stated that the Ti-20Au alloy exhibited the lowest E corr value, equal to − 278.33 mV, but the lowest corrosion current density was observed for the Ti-5Au alloy. Thin gold films (with a thickness of about 50 and 100 nm) which have been applied to Ni–Cr–Mo alloys using magnetron sputtering technique were tested by Wadullah et al 44 . The corrosion behavior of the samples was studied in an artificial saliva solution at 37 °C.…”

“…Similar electrochemical corrosion results were achieved during immersion in Ringer's solution [22][23][24] . The good anticorrosive properties of such alloys were also resulted from the addition of gold as an alloying element 42 or as nanoparticles located in an applied coating 43,44 . Lee et al 42 studied the corrosion resistance of Ti-xAu alloys (x = 5, 10, 15, 20 and 40 wt.%) in 0.9% NaCl solution at 37 °C.…”

Surface characteristics of additively manufactured CoCr and Ti6Al4V dental alloys: The effects of carbon and gold thin film coatings, and alkali‐heat treatment

“…Furthermore, C-coatings were shown to reduce bacterial adhesion on various alloys, suggesting their potential advantages for oral applications (Kula et al, 2021). Similarly, gold (Au) thin film coatings have demonstrated a considerable enhancement in the localized corrosion resistance of NiCrMo alloys when exposed to corrosive media (Wadullah et al, 2022). The application of a nanometric gold-palladium (Au-Pd) coating on metallic surfaces, such as polished stainless steel substrates or acid-etched pure titanium substrates, was shown to improve the long-term adhesion of human osteoblasts, indicating the potential benefits on biocompatibility in dental and orthopedic applications (Anselme & Bigerelle, 2006).…”