Cs0.33WO3 for preparing sunshade glass is also known as cesium tungsten bronze that has the property of shielding most of the near infrared rays and transmitting more than 70% visible light to shield heat radiation and ensure daylighting.
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According to the experts, the Cs0.33WO3 nanoparticles also have the near-infrared photothermal conversion property. And they investigated the NIR photothermal conversion property in deionized water at different concentrations. The aqueous dispersion of Cs0.33WO3 nanoparticles was added to a 2-mL polystyrene cell, and then the dispersion was exposed to an 808-nm diode laser with an irradiation area of 0.3 cm2 and an intensity of 820 mW. The temperature of aqueous dispersion was detected with a thermocouple. Photothermal conversion efficiency was calculated. For the study on the photothermal stability of Cs0.33WO3 nanoparticles under NIR irradiation, the 0.08 wt.% aqueous dispersion of Cs0.33WO3 nanoparticles obtained after grinding for 3 h was continuously re-exposed to an 808-nm diode laser for 5 cycles. For each cycle, the aqueous dispersion was irradiated for 10 min and then cooled to the initial temperature. Using a thermocouple, the variation of temperature with time was monitored.
