Abstract
<abstract> A composite film composed of Ag nanoparticles, Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> was prepared by cosputtering. Ag NPs were immersed in the Al<sub>2</sub>O<sub>3</sub> host, TiO<sub>2</sub> was deposited onto the Ag/Al<sub>2</sub>O<sub>3</sub> layer. The degradation of aqueous methylene blue under incident irradiation indicated that the Ag/Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> composite film with the Ag-TiO<sub>2</sub> distance of 2nm or 5nm exhibited high degradation rate. Spectral absorptivity and radiant absorption distribution were analyzed through FDTD simulation to analyze the relationship between radiant absorption and photocatalytic activity. Results indicated that the spectrum and distribution of the radiant absorption in the composite film could be rationally regulated to improve photocatalytic activity. </abstract>
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