Photocatalytic degradation properties of amorphous TiO_2-Ag thin film

The argentum-doped titanium oxide thin films were deposited on slides by magnetron sputtering,The crystalline phase,surface component and film thickness were determined by XRD,XPS,AFM,STS and Ellipsometric examination.The experiment results showed that TiO2-Ag films are amorphous,and simple substance argentum exists on the surface of film,and the proportion of Ag and Ti is 1.8∶1.The STS spectra showed that the prepared film possesses a band gap of 1.8eV.The result of photodegrading methylene blue which concentration is 10mg/L showed that with the thickness of the film increasing the rate of photodegradation rises.When the thickness of the film is 360nm,the rate of photodegradation is 90% in 2h,and when the thickness of the film is over 360nm,the rate of photodegradation doesn't increase.The result of photodegrading rhodamine B which concentration is 2mg/L showed that with the thickness of the film increasing the rate of photodegradation raises a little,the rate of photodegradation is 88.7% in 3h.