The preparation of a high performance near-infrared shielding CsxWO3/SiO2 composite resin coating and research on its optical stability under ultraviolet illumination

Abstract

Cesium-doped tungsten bronze Cs_xWO₃ is an ideal near infrared (NIR) shielding material for solar filters. However, the Cs_xWO₃ nanoparticle dispersed resin film exhibits obvious photochromic behavior under ultraviolet (UV) illumination, which severely hinders the commercial application of Cs_xWO₃. In this paper, Cs_xWO₃/SiO₂ composite resin coatings were successfully prepared with excellent NIR shielding ability and outstanding optical stability under strong UV illumination by combining an ultraviolet-absorbing agent (UVA) with SiO₂. The roles of UVA and SiO₂ in preventing the photochromic behavior of the Cs_xWO₃/SiO₂ composite resin coating were vital, reducing the photochromic reaction rate by UVA and limiting the photochromic reaction areas by SiO₂. In sum, our research provides a new solution for eliminating the photochromism of a Cs_xWO₃-based resin film and it may have practical application in architecture and automobiles.