Gas Phase Synthesis of Cesium Tungsten Bronze Nanoparticles and Their Evaluation as Near-infrared (NIR) Absorbing Materials

Abstract

Cesium tungsten oxide (Cs_0.32WO₃) nanoparticles are widely applied to solar control films on windows of automobiles and buildings due to their remarkable near-infrared (NIR) light absorption property. In this review, the presence of tungsten deficiency in Cs_0.32WO₃ nanoparticles through the rapid quenching process of the spray pyrolysis method is demonstrated for the first time. Notably, the relation between tungsten deficiency in tungsten bronze crystals and NIR-absorption properties was clarified in detail. In addition, Cs_0.32WO₃ nanoparticles produced through the spray pyrolysis method exhibited the improvement of photochromic stability.

Graphical Abstract