Abstract
Improving photocatalytic activity of traditional photocatalysts is one of the actual topics. We fabricated the single phase multiferroic BiFeO3 thin films on SiO2/Si substrates using sol_gel method and analyzed the effect of thermal annealing on photocatalytic properties of the film. Experimental results show that all the samples had a single perovskite rhombohedral structure and are randomly oriented. The estimated band gap values of the films are 2.63, 2.88, and 2.92 eV, respectively. BiFeO3 thin films show good photocatalytic properties in the degradation of methylene blue solution under visible-light irradiation. These results indicate that the microstructure, optical, and photocatalytic properties of BiFeO3 thin films have a strong dependence on annealing temperature. We hope that this work could provide a new route for preparation of highly efficient photocatalysts.
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