Yellow Tungsten Oxide Cellulose Nanocrystal Composite Film Applied for Electrochromic Device

Yellow tungsten oxide cellulose nanocrystal composite film is a film of tungsten trioxide with a certain amount of cellulose nanocrystal that has the characteristics of good electrochromic performance, high transmission modulation and very good cycling stability for applications in electrochromic device. In a report, some researchers prepared the composite films of yellow tungsten oxide and cellulose nanocrystals via a sol-gel method and investigated their electrochromic properties.

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In the report, it said that after mixing cellulose nanocrystal gel into a tungsten oxide precursor solution, the researchers dipped the indium-tin-oxide-coated glass substrates into the composite solution. And subsequently the obtained glass was annealed at 170°C. And there is a composite film consisted of cellulose nanocrystals dispersing in the tungsten oxide matrix. The resulting nanocomposite was found to be amorphous, exhibiting a high transmission modulation and very good cycling stability. After having tested a range of compositions, a film of yellow tungsten oxide with 10% cellulose nanocrystal was found to be the most uniform and showed good electrochromic performance.

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