The Surface Chemistry of Hybrid Nanometer-Sized Particles
Nanometer sized Au/TiO2 particles were synthesized by irradiation of a HAuCl4 solution containing colloidal TiO2 with light of wavelength (lambda) >330 nm. The absorption maximum attributed to the surface plasmon band of gold was observed at 530 nm, a red shift of about 10 nm from the position in aqueous solution. The particle size of Au/TiO2 determined by TEM was about 25 nm. The Au clusters are situated on the surface of TiO2 in terms of microcrystallite, which was confirmed by HRTEM, EDS, and XRD. A negative shift of binding energy in the Au 4f7/2 for gold cluster on the surface of TiO2 was found, and the electronic interaction between the metal and the support was discussed.
Wang
Cy
Institute of Photographic Chemistry, Academia Sinica, Beijing, 100101, P. R. China
Liu
Cy
Chen
J
Shen
T