Nano Cs0.33WO3, or nano cesium tungsten bronze, is a type of near infrared shielding material.
The photochromic property of CS0.33WO3 is derived from the fact that the small radius metal ions (Cs+) in the cesium tungsten bronze can enter and exit freely in the tunnel structure. Cesium tungsten bronze is also called Cs-doped tungsten bronze or Cs-doped tungsten oxide. And its doping method is reversible doping. When the doping amount of the metal ions (Cs+) is changed, cesium tungsten bronze will have a correspondingly changed color. Tungsten oxide is colorless. And thin film of tungsten oxide can absorb ultraviolet light waves with shorter wavelengths and undergo electron transition. When doped with metal ions (Cs+), defects of tungsten oxide in the energy level at the low energy band can be excited by visible light to generate electronic transition phenomenon. Studies have shown that cesium tungsten bronze has excellent photochromic properties both in the ultraviolet and visible bands.
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