Investigation on composite Au /TiO2 nanoparticles (I)

Nanometer sized Au/TiO₂, particles were synthesized by irradiation of a HAuCl₄ solution containing colloidal TiO₂ with light of wavelength (λ) > 330 nm. The absorption maximum attributed to the surface plasmon band of gold was observed at 540 nm, a red shift of about 20 nm from the position in aqueous solution. The Au clusters are situated on the surface of TiO₂ in terms of microcrystallite, which was confirmed by HRTEM, EDS and XRD. The electronic interfaction between the metal and the suport was discussed.