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ZONG-LAI LIU1, GUO-PENG ZHU1, ZHENG-YI WANG1, LI-CHEN ZHAO1, BO DONG1, YONG-HE DONG1, WEI FENG1,*
Novel visible light photochromic silica sol gel hybrid film was successfully synthesized by blending the composite of bismuth vanadate (BiVO 4 ) and phosphotungst ic acid (PWA). The crystal phase, microstructure, photochromic properties and mechanism were investigated via X raydiffraction ( XRD ), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT IR), ultraviolet visible (UV Vis) spec tra and X ray photoelectron spectroscopy (XPS). XRD pattern confirmed the existence of BiVO 4 and PWA in SiO 2 sol gel composite films. FT IR results indicated that the basic structure of BiVO 4 nanopartical and the Keggin geometry of PWA were not damaged in the process of compositing and there was a strong interaction between BiVO 4 and PWA. TEM images showed that PWA with the homogeneous spherical morphology well dispersed in the surface of BiVO 4 and a part of PWA embedded into BiVO 4 hybrid film. Irradiated w ith visible light, the composite film turned to blue from colorless. The hybrid film showed reversible photochromism in the presence of oxygen. According to XPS results, PWA accepted electrons from BiVO 4 and the photo reduction process was concerned with p hotogenerated electron transfer mechanism..
Silica sol gel B ismuth vanadate Polyoxometalates Hybrid film Visible light photochromism.
ZONG-LAI LIU, GUO-PENG ZHU, ZHENG-YI WANG, LI-CHEN ZHAO, BO DONG, YONG-HE DONG, WEI FENG, Novel hybrid silica thin film based on bismuth vanadate and polyoxometalates system: visible-light photochromic behavior and mechanism, Optoelectronics and Advanced Materials - Rapid Communications, 13, 5-6, May-June 2019, pp.320-325 (2019).
Submitted at: Oct. 12, 2018
Accepted at: June 14, 2019
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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