Cs0.32WO3, or cesium tungsten bronze, exhibits strong absorption of near-infrared (NIR) in the range of 1000-2500 nm so that it is often applied for preparing transparent heat-insulation coating. Some experts have synthesized Cs0.32WO3 powder via the hydrothermal reaction by using citric acid and D-malic acid (weight ratio of 1.41:1) as the mixed reducing agent at 175 °C for 24, 48 and 72 h.
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According to the experts, the UV-Vis-NIR absorption spectra of Cs0.32WO3 powders show that cesium tungsten bronze powders exhibit strong absorption of NIR in the range of 1000- 2500 nm. And the NIR absorption of Cs0.32WO3 improves with the increase of reaction time. The CS0.32WO3 powders obtained by reaction time of 72 h has the highest absorption at 1314 nm, and the absorbance is up to 1.92. Based on above results, great crystallinity and rod-like morphology are main factors for achieving higher NIR absorption property of Cs032WO3 powders.
