How to Prepare Yellow Tungsten Oxide?

How to prepare yellow tungsten oxide? More specifically, how to prepare yellow tungsten oxide powder with excellent photochromic property? Yellow tungsten oxide, also called tungsten trioxide or WO3, is commonly used in the fields of light regulation, optical switch, optical information storage, optical device materials, optical information genetic materials, etc. Therefore, it is essential to prepare tungsten trioxide with excellent photochromic properties.

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Preparation of Tungsten Trioxide by Chemical Precipitation

Weigh 3.00g of sodium tungstate and 0.005g of PVP, dissolved in 30ml of distilled water, stir evenly, take 3ml of the above solution dropwise into 5ml of HCl with a concentration of 3 mol/L, and stir for 2h to complete the reaction. Then, the reaction-completed solution was filled in a centrifuge tube and centrifuged in a tabletop centrifuge, and then washed repeatedly with distilled water and acetone 3-4 times. After drying in a blast drying oven at 80 °C for 6-7 h, it is placed in a muffle furnace and burned at 300 °C for 3 h to obtain monoclinic WO3 powder, with excellent photochromic properties.

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