Tungsten trioxide can be applied to ITO conductive glass. Specifically, some experts have adopted a solvothermal method to prepare a tungsten trioxide nano array electrochromic film with the morphology of nano-clusters, nano-trees or nanowire arrays on ITO conductive glass, thereby avoiding the disordered growth of tungsten oxide nanowires in the existing preparation method. Moreover, the preparation process is simple. And the structure and morphology of tungsten trioxide nano-array composed of thin film can be conveniently controlled. The manufacturing cost is low. Also, it is easy to realize large-area production.
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In addition, experts used electrochemical workstations and spectrophotometers to test the spectral changes and electrochromic response speeds of the prepared WO3 nano array electrochromic film. A square wave voltage of -0.7V to 1.0V was applied to a 0.5mol/L aqueous solution of sulfuric acid, and the transmittance change value of the film in the wavelength range of 400-2500nm and the reflectance change value in the wavelength range of 2.5-25μm were measured. The transmittance response time at 633nm is the electrochromic response speed. Experts found that after applying a square wave voltage of -0.7V and 1.0V, the transmittance changes at 633nm and 2000nm were 66.5% and 73.8%, respectively; the reflectance at 8μm was 57.7%; fading and coloring response speed are 4.6s and 3.6s respectively. After 4,500 cycles, 77.5% of the initial optical simulation was maintained.
