Nano Structured Crystalline Tungsten Oxides

Tungsten oxides, as one of the important oxide semiconductors, are the most widely investigated materials for EC devicesbecause they can be used as intercalation host for H⁺, Li⁺, Na⁺,and Zn²⁺ to form tungsten bronze with blue color due to their special tunnel structure. 

With the development of tungsten oxide films, nowday it has been widely used in many area such as energy-saving smart windows,high contrast displays, sunroofs, and antiglare mirrors.but after many studies found amorphous tungsten oxide films have poor electrochemical stability, so research work has been mainly focused on nano structured crystalline tungsten oxides. For instance, some researcher reported that WO₃ nano particles showed greater charge density for proton intercalation and comparable coloration efficiency compared with conventional amorphous WO₃ films. Researcher fabricated WO₃ nanowires and investigated their electrochromic property. They found that the nanowires showed fast optical response time and high coloration efficiency. Researcher also reported that WO₃ nanorods exhibited high electrochromic stability and comparable color display, contrast and coloration/bleaching response.

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