Abstract
This work reports effective activated multiple layers Ag-TiO2 films and Ag-TiO2/Ag films via a solgel and direct coating approach. Scanning electron microscopy and transmission electronic microscope are performed to characterize the morphology. The roles of metallic Ag on TiO2 films for photodegradation stearic acid are explained by UV–vis spectroscopy and photoluminescence spectroscopy. The photocatalytic activity of Ag-TiO2 films for stearic acid decomposition is 5 times higher than that of pure TiO2 films. Different Ag-TiO2/Ag films have almost the same activity of photodegradation stearic acid. The strong surface plasmon resonance effect of Ag makes TiO2 absorb more visible light. The separation effect of photogenerated electron–hole pairs could be increased by doping a small amount of Ag. For more Ag amount in Ag film, there will likely be an equilibrium between the separation of electron–hole pairs and the recombination of them.
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