Nanocrystalline Yellow Tungsten Oxide Film

Compared with the pure yellow tungsten oxide film (WO3 film), the nanocrystalline yellow tungsten oxide film (nanocrystalline WO3 composite film) has a significantly enhanced electrochromic optical modulation amplitude and a faster response time. And its reversibility and coloring efficiency are also improved at the same time.

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But, why do nanocrystalline yellow tungsten oxide film has better performance than WO3 film? According to the experts, this is because nanocrystallines form a composite interface in WO3 thin films, which improves the film's micromorphology, provides more paths for ion diffusion and migration, and provides an active reaction interface for electrochromic reactions. Besides, the experts also introduced something about electrochromism - the reversible change in optical properties that can occur when the nanocrystalline WO3 film is electrochemically oxidized. Such a film can display distinct visible color changes, with the color change commonly being between a transparent (‘bleached’) state and a colored state, or between two colored states.

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