Abstract
The good biocompatibility of Titanium-based medical device is related to the thin oxide layer (titanium dioxide, TiO2) formed on the surface. In this study, Plasma Immersion Ion Implantation (PIII) method and Optical Emission Spectrometer (OES) were used to produce oxidized surface in order to study the influence of plasma composition on surface composition. The result of OES showed that higher electron temperature, more metastable argon atom and oxygen ion content facilitate the formation of TiO2 top surface. The treated implant surfaces possessed higher content Ti2O3, lower contact angle. When the atomic percentage of Ti2O3 is similar to the TiO2, the contact angle is close to zero, which could attribute to the photocatalytic activity of self-doped TiO2−x. It generates more hydroxyl groups under visible light, causing a decrease in contact angle. But release of titanium ions was found in some solutions. It is believed that the TiO2−x produced by low energy oxygen ion implant has super hydrophilic properties, which indicates the potential for improved implant osseointegration in vivo.
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