Microstructure characteristics of copper single layer and copper/titanium multilayer coatings: Nanomechanical properties and bactericidal activities
The bacterial infections associated with metallic surfaces in the clinical environments obviously lead to vulnerable diseases. A protective layer on these surfaces is imperative, so as to reduce the risk of infections due to microbes. From this perspective, the Cu based single layer and multilayer coatings were grown on 316L stainless steel (SS) and titanium substrates by the DC magnetron sputtering technique. These coatings were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), field emission scanning electron microscope (FE-SEM), atomic force microscope (AFM) and energy dispersive X-ray analysis (EDX). The evaluation of nanomechanical properties, surface wettability and antimicrobial efficacy of the coatings was also carried out in detail. The antimicrobial properties of the coatings were studied against Gram-positive bacteria (S. aureus) by two methods: disc diffusion method and fluorescence staining. The single layer Cu coating at 200 ?C and [Cu/Ti]25 multilayer coatings on both substrates exhibited enhanced antimicrobial activity. However, the nanomechanical properties were found to be four times higher for the multilayers than for the single layer coatings.
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Document Type: Research Article
Publication date: December 1, 2014
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