Synthesis of Au/TiO₂ core-shell structure nanoparticles and the crystallinity of TiO₂ shell

The synthesis of Au/TiO₂ core-shell structure nanoparticles was carried out by the hydrolysis of TOAA (titanium oxide acethylacetonate) in gold sol ethanol solution with water. It was possible to achieve 1 nm thick TiO ₂ shell on the surface of gold particles. The morphology and the crystallinity of TiO₂ shell were investigated by TEM and UV-vis absorption spectrometer. The crystral structure of TiO₂ shell was amorphous because the surface plasmon band of gold nanoparticles appeared only when the radioactive ray was irradiated on the TiO₂-coated gold sol ethanol solution.