Cs doped tungsten oxide nanoparticles for energy-saving building are also known as cesium tungsten bronze (CsxWO3) nanoparticles of near-infrared (NIR) shielding performance, which can be synthesized by hydrothermal reaction at 190 °C using sodium tungstate and cesium carbonate as raw materials. Some scholars have prepared hexagonal Cs0.32WO3 nanoparticles by using the abovementioned conditions and investigated the effects of N2 annealing on the microstructure and NIR shielding as well as heat insulation properties of Cs doped tungsten oxide nanoparticles for energy-saving building.
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The results indicated that subsequent N2 annealing could further improve the crystallinity of CsxWO3 particles. Moreover, the NIR shielding and heat insulation properties of CsxWO3 could be further improved after N2 annealing at appropriate temperature for a period of time. Particularly, the 500 °C-annealed CsxWO3 products in the N2 atmosphere showed the best NIR shielding and heat insulation properties. When the N2 annealing temperature was higher than 700 °C, the NIR shielding properties decreased again. The 800 °C-annealed samples in the N2 atmosphere showed higher visible light transmittance, however, the NIR shielding properties were lower than that of the non-annealed samples.
