Preparation and photochromism performance of P₂W₁₆Mo₂/PVA/TiO₂ composite films

Abstract

P₂W₁₆Mo₂/PVA/TiO₂ composite films were prepared by doping TiO₂ nanoparticles (P25) into P₂W₁₆Mo₂/PVA. Irradiated with UV light, composite films changed from light yellow to blue. P₂W₁₆Mo₂/PVA and P₂W₁₆Mo₂/PVA/TiO₂ composite films (before and after UV irradiation) were characterized by IR spectroscopy, which verified that the basic structure of H₆P₂W₁₆Mo₂O₆₂ and PVA were not destroyed in the composite films. The photochromism performance of P₂W₁₆Mo₂/PVA and P₂W₁₆Mo₂/PVA/TiO₂ composite films were explored by UV–vis absorption spectra. Compared with P₂W₁₆Mo₂/PVA composite films, photochromism response time of composite films doped in TiO₂ was more sensitive and the UV–vis adsorption spectra absorbance increased significantly. With time, P₂W₁₆Mo₂/PVA/TiO₂ composite films had a circulation ability of rising-fading color. The composition of the composite film with the best photochromism performance was obtained.

Graphical Abstract

Keywords:

• Polyoxometalate
• composite film
• photochromism

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was financially supported by the National Key Research and Development Program of China (2016YFB0901600), the Zhejiang Provincial Natural Science Foundation of China (LY18B010001), the PhD Research Startup Foundation of Liaoning Institute of Science and Technology (1910B05) and the Foundation of Liaoning Educational Committee (L2019lkyjc-04).