Violet tungsten oxide, or WO2.72, has received considerable attention for its use in the preparation of infrared-shielding material, which can be used for smart windows in automobiles and buildings.
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Some experts developed WO2.72 nanorods coated on a quartz glass. Excellent heat-insulating performance was realized even after the WO2.72 nanorods on a quartz glass were irradiated for 1 h, when the inner temperature was increased to only 26.2 °C, which was much lower than the temperatures reached using the quartz glass and indium–tin oxide glass. Also, WO3?x and MxWO3 (M = Na+, K+, Rb+, Cs+, and NH+4) are candidates for such applications. Among the many tungsten materials with a capability of shielding NIR light through absorption mechanism, cesium tungsten oxide (particularly Cs0.33WO3) nanoparticles are considered highly promising materials for transparent heat insulation applications. The hybrids of WO3 and MxWO3 for NIR shielding applications have been widely studied. However, to the best of our knowledge, WO2.72 and its hybrid have yet to be fully explored in this field.
