WO3 may be applied for producing a new type of transparent thermal insulation paper, that is, a transparent tungsten trioxide electrochromic film. The obtained heat insulating film is a WO3 nano-array electrochromic film with the morphology of nano-clusters, nano-trees or nanowire arrays. And such new thermal insulation film has the advantages of large spectral adjustment range, high coloring efficiency, fast response speed, and long cycle life. In field of electrochromism, that is, in the field of smart window, tungsten trioxide has broad application prospects.
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Experts said that the optical properties of the inorganic electrochromic film of nano grain size tungsten trioxide can be characterized by a Lambda 950 UV-Vis spectrophotometer with a wavelength of 300-800nm. Generally, the platinum sheet/wire is the counter electrode, the Ag/AgCl is the reference electrode, the WO3 film is the working electrode, and the 1mol/L lithium perchlorate/propylene carbonate solution is used as the electrolyte, to conduct the electrochemical performance test of the film sample.
