Enhanced visible-active photochromism of a polyoxometalates/TiO2 composite film by combining Bi2O3 nanoparticles
Abstract
A novel photochromic hybrid film was successfully synthesized by introducing Bi2O3 into a phosphomolybdic acid (PMoA)/TiO2 system as a visible light sensitizer. The influence of Bi2O3 addition on microstructure and photochromic properties was studied via transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectra (UV-vis) and X-ray photoelectron spectroscopy (XPS). The results revealed that the Keggin geometry of PMoA and basic structure of Bi2O3 were preserved in the obtained film, and the interaction between PMoA and TiO2 was strengthened after combining Bi2O3. Upon visible light irradiation, the composite films changed from colorless to blue and showed reversible photochromism in the presence of oxygen. Moreover, the photochromic performance of the Bi2O3/PMoA/TiO2 film was better than that of PMoA/TiO2 film. The amount of PMoA participating in the photo-reductive reaction increased after adding Bi2O3 into the PMoA/TiO2 composite, which resulted in photochromic efficiencies enhancing.
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