Tungsten Oxide Thin Nanosheets

Tungsten oxide ultrathin nanosheets were successfully stripped by liquid phase stripping method and used for the study of electrochromic properties. The nanosheet thickness of only 1.4 nm, size of 500 nm. Access to different voltages, tungsten oxide thin nanosheets in the colorless and dark blue reversible conversion between the color. The research focuses on the electrochromic properties of tungsten oxide ultrathin nanosheets and bulk tungsten oxide.

At an absorption wavelength of 798 nm, the difference in light transmittance of the ultrathin tungsten oxide sheet under coloring and fading conditions was 48%, while that of the bulk tungsten oxide material was only 16.2%. The nanorods also performed well when the coloring / fading response time was compared, with a coloring response time of 5.1 s and a fading response time of 9.7 s, much better than the 13.4 s and 12.5 s for the bulk tungsten oxide material and superior to the oxidation Response Time of Tungsten-Based Electrochromic Devices. These results show that tungsten oxide ultrathin nanosheets exhibit good flexibility and higher lithium ion diffusion coefficient than bulk tungsten oxide materials.

Combining thermal evaporation with high temperature calcination, tungsten oxide nanowires with a diameter of 30-70 nm and a few microns in length were successfully prepared on a conductive glass substrate. Experiments show that the electrochromic thin film composed of the ultra-long tungsten oxide nanowires exhibits almost no change in the cyclic voltammetry curve after 1000 cycles, showing good stability. When the absorption wavelength was 700 nm, the light transmittance of the film was 34.5% under the conditions of coloring and fading, which showed better coloring / fading efficiency. This one-dimensional long nanowire structure increases the specific surface area of the material, accelerating the increase of the charge amount and rapid electron transfer, thereby achieving a fast-optical response.

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