Cesium Tungsten Bronze (CsxWO3) is a non-stoichiometric functional compound with a special oxygen octahedral structure. It has low resistivity and low temperature superconductivity. In recent years, it has been discovered that CsxWO3 film has good near-infrared shielding performance, which is expected to replace the existing ITO conductive glass. As a window material, it can be used as a good near-infrared heat insulation material. It is very attractive in the automotive and construction fields.

How to Make the Cs0.33WO3?

Citric acid induced hydrothermal synthesis
According to the chemical formula of CsxWO3 (0 1. Preparation of CsxWO3 powder
A Using analytical pure sodium tungstate Na2WO4·2H2O as raw material, prepare a sodium tungstate solution with a concentration of 0.5 mol/L.
B Obtain tungstic acid sol by cation resin exchange, add 1 mol/L or 2 mol/L citric acid (analytical pure) solution and 0.3 mol/L cesium carbonate Cs2CO3 (analytical pure) solution, stir well, The precursor of the hydrothermal reaction is obtained.
C Put the precursor liquid into the autoclave, react at 190 ℃ for 3 d, and then go through ultrasonic washing, alcohol washing, centrifugation and drying to finally obtain CsxWO3 powder.
2. Preparation of CsxWO3 film
After the CsxWO3 powder is fully ground, it is ultrasonically dispersed in a citric acid solution for 1 h, and then added to a 0.1g/mL polyvinyl alcohol (PVA) solution, stirred in a water bath at 80 ℃ for 30 min, and aged for 1 d to obtain Coating latex, using dipping and pulling method to prepare CsxWO3 film on glass slide.

What is its application?

Near infrared shielding performance and heat insulation performance
Infrared light, also called infrared light, is an electromagnetic wave with a wavelength between microwave and visible light. The wavelength is between 760 nanometers (nm) and 1 millimeter (mm), which is longer than red light v non-visible light. According to the wavelength, it can be divided into near infrared , Mid-infrared and Far-infrared. Infrared light, especially near-infrared light, has a significant thermal effect, which can easily cause the temperature to rise, thereby causing the temperature in the room or car to rise. Therefore, in order to respond to the disadvantages of infrared, film is applied to buildings, especially architectural glass and automobiles. And with the popularity of car beauty, film is an essential part. The use of the film can not only heat insulation, but also prevent solar radiation, prevent skin diseases, greatly extend the use time of interior decorations, and make the indoor temperature relatively constant. The currently disclosed near-infrared shielding materials generally refer to a type of functional film material that has strong absorption or reflection of near-infrared light without affecting the transmission of visible light. As a transparent heat insulation material, it is used in the fields of green building energy saving and automobile glass heat insulation. It has a very broad application prospect. [1]
Near-infrared shielding materials generally refer to a type of functional film material that has strong absorption or reflection of near-infrared light without affecting the transmission of visible light. As a transparent heat insulation material, it has a wide range of energy-saving green buildings and automobile glass heat insulation. Application prospects. The inorganic materials that have been reported to have strong near-infrared absorption or reflection performance are mainly concentrated in conductive oxides, such as antimony tin oxide (ATO), indium tin oxide (ITO) and aluminum zinc oxide (AZO). The material film can generally shield near-infrared light with a wavelength greater than 1500 nm.
Cesium Tungsten Bronze (CsxWO3) has a near-infrared shielding performance that has only been discovered in recent years. CsxWO3 film can shield near-infrared light with a wavelength greater than 1 100 nm. After the glass surface is coated with CsxWO3 film, its near-infrared shielding performance and heat insulation The performance is enhanced with the increase of cesium content in CsxWO3. Among them, glass coated with CsxWO3 film has the best thermal insulation performance. Compared with blank glass, the thermal insulation temperature difference can reach 13.5℃. Therefore, it has more excellent near-infrared shielding performance, and is expected to be widely used as a smart window in the field of building and automotive glass insulation.

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