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Microstructural characterisation of biocompatible sol-gel derived vanadium-aluminium doped TiO2 on Ti substrates

ABSTRACT: Sol-gel derived pure titania is compared with vanadium and / or aluminium modified titania deposited by spin coating on pure titanium substrates annealed at 300°C and 650°C. Reflection high-energy electron diffraction indicated the presence of anatase from the surface layers of samples annealed at 300°C with a transition to rutile with increasing annealing temperature and addition of vanadium. Cross-sectional transmission electron microscopy indicated a gradation of Ti-0 phases through the layer with the dominant presence of rutile. Aluminium was found to inhibit grain growth while vanadium promoted crystallisation.