Structure and Properties of - Nanocomposite Films for Biomedical Applications

Abstract

The hemocompatibility of La2O3-doped TiO2films with different concentration prepared by radio frequency (RF) sputtering was studied. The microstructures and blood compatibility of TiO2films were investigated by scan electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and UV-visible optical absorption spectroscopy, respectively. With the increasing of the La2O3concentrations, the TiO2films become smooth, and the grain size becomes smaller. Meanwhile, the band gap of the samples increases from 2.85 to 3.3 eV with increasing of the La2O3content in TiO2films from 0 to 3.64%. La2O3-doped TiO2films exhibit n-type semiconductor properties due to the existence of Ti2+and Ti3+. The mechanism of hemocompatibility of TiO2film doped with La2O3was analyzed and discussed.