Nanostructured TiO2/TiN Multilayer Coatings on AISI 316L Stainless Steel for Biomedical Applications
TiO2/TiN multilayer coatings have been prepared by radio frequency (RF) reactive magnetron sputtering at 400 °C. The as-prepared multilayer coatings were characterized using X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The X-ray diffraction spectrum indicated the presence of both TiN and TiO2 phases. FE-SEM image showed smooth surface with uniform morphology. Raman spectrum exhibited characteristic peaks at 156, 210, 272, 339, 410, and 614 cm–1. The chemical composition of the multilayer coatings was confirmed from the XPS analysis. Electrochemical studies were performed on the coated and uncoated samples using potentiodynamic polarization, and electrochemical impedance spectroscopic measurement. Compared with individual TiN, TiO2 coatings and bare substrates, TiO2 /TiN multilayer coating showed better corrosion resistance behavior in phosphate buffered saline solution. The results showed that the multilayer coatings are corrosion-resistant, which can be used for the modification of implanting materials in biomedical applications. The biocompatibility of the specimens was evaluated by platelet adhesion test which showed that TiO2/TiN multilayer coatings exhibited improved blood compatibility.
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Document Type: Research Article
Publication date: September 1, 2013
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