Tungsten Oxide Ultrathin Nanosheets Electrochromic

Electrochromic refers to the phenomenon that the optical properties (such as reflectivity, transmittance, absorption rate, etc.) of tungsten oxide nanosheets undergo a stable and reversible color change under the action of an applied electric field. In appearance, it shows the reversible change of color and transparency of tungsten oxide nanosheet. Materials with electrochromic properties are called electrochromic materials and devices made with electrochromic materials are called electrochromic devices.

The principle of electrochromic is the insertion and extraction of ions in the material. The use of lithium chloride solution as the electrolyte can test the electrochromic properties of tungsten oxide nanosheets. As a low-dimensional layered nanomaterial, tungsten oxide nanosheets have larger specific surface area and smaller size, which is conducive to the diffusion of ions in them and should exhibit more excellent electrochromic properties. It can be seen from the figure that at the voltage of + 3V, the color of the tungsten oxide nanosheet assembly has not changed. Its color is bright yellow with a light transmission of 47.3% at 780 nm. Under the voltage of -3V, the color of the module changed to dark blue, which reflected the electrochromic properties.

Currently, the light transmittance of tungsten oxide nanoplatelets was 5.7% at 780 nm. The difference of transmittance of tungsten oxide nanosheets between + 3V and -3V reached 41.6%. Although the body of tungstic acid can also show electrochromic properties, but the same conditions, the transmittance difference of only 10.4%, much lower than the difference between the transmittance of tungsten oxide nanosheet. In summary, the tungsten oxide nanosheets exhibit excellent electrochromic properties, which also illustrates the successful stripping of tungsten oxide nanoplates from the side.

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