Tungsten oxide nano-belt structure electrochromic film preparation method

An electrochromic and nanobelt technology, applied in the direction of tungsten oxide/tungsten hydroxide, coatings, etc., can solve the problems of unsatisfactory electrochromic performance, hindering electrochromic electron transport, and complicated preparation process of seed layer, etc. Achieve the effect of improving electron transmission efficiency, improving electrochromic response speed, and shortening dispersion path

Inactive Publication Date: 2017-09-22
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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Problems solved by technology

The electrochromic properties of the above-mentioned nanostructured tungsten oxide films have been greatly improved, but there are still many problems in practical applications, such as: (1) The preparation process is complicated, and these tungsten oxide nanostructures are all made of seed crystals layer-assisted hydrothermal preparation, so a layer of tungsten oxide seed layer should be prepared on the conductive substrate first before hydrothermal treatment, and the preparation process of the seed layer is relatively complicated, and a heat treatment process is also required; (2) the seed layer Existence will hinder the electron transport in the electrochromic process, because the seed layer is generally composed of fine nanocrystals, the structure is relatively dense, so the electron transport resistance is relatively large; (3) The electrochromic performance can not meet the needs of practical applications , yet to be improved

Method used

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  • Tungsten oxide nano-belt structure electrochromic film preparation method
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  • Tungsten oxide nano-belt structure electrochromic film preparation method

Examples

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Effect test

Embodiment 1

[0029] Immerse the FTO conductive glass in deionized water and ultrasonically wash it for 15 minutes, dry it with nitrogen gas, and irradiate it under a UV lamp for 5 minutes before use. Weigh 0.3042g of paratungsine and 6.3g of oxalic acid dihydrate and dissolve them in 25mL of absolute ethanol, and obtain a reaction solution after ultrasonic oscillation; then transfer the reaction solution to a hydrothermal reaction kettle, and place the cleaned FTO conductive glass Invade into the hydrothermal kettle containing the reaction solution, in which the FTO conductive glass is placed obliquely with the conductive side facing down, and kept at 200 °C for 8 hours, and finally cooled to room temperature naturally, and the FTO conductive glass is taken out, washed with water and ethanol in sequence, and then dried. Then the obtained film was calcined at 400°C for 1.5 hours to obtain the electrochromic film with tungsten oxide nanoribbon structure. figure 1 For the X-ray diffraction pa...

Embodiment 2

[0032]Immerse the FTO conductive glass in deionized water and ultrasonically wash it for 20 minutes, blow it dry with nitrogen gas, and irradiate it under a UV lamp for 3 minutes before use. Weigh 0.3042g of paratungsine and 6.3g of oxalic acid dihydrate and dissolve them in 25mL of absolute ethanol, and obtain a reaction solution after ultrasonic oscillation; then transfer the reaction solution to a hydrothermal reaction kettle, and place the cleaned FTO conductive glass Invade into the hydrothermal kettle containing the reaction solution, in which the FTO conductive glass is placed obliquely with the conductive side facing down, and kept at 200°C for 4 hours, and finally cooled to room temperature naturally, and the FTO conductive glass is taken out, washed with water and ethanol in sequence, and then dried. Then the obtained film was calcined at 350° C. for 3 hours to obtain an electrochromic film with a tungsten oxide nanoribbon structure. Figure 6 It is a scanning electr...

Embodiment 3

[0034] Immerse the FTO conductive glass in deionized water and ultrasonically wash it for 30 minutes, dry it with nitrogen gas, and irradiate it under a UV lamp for 1 minute before use. Weigh 0.1521g of paratungsine and 6.3g of oxalic acid dihydrate, dissolve them in 25mL of absolute ethanol, and obtain a reaction solution after ultrasonic oscillation; then transfer the reaction solution to a hydrothermal reaction kettle, and place the cleaned FTO conductive glass Invade into the hydrothermal kettle containing the reaction solution, in which the FTO conductive glass is placed obliquely with the conductive side facing down, and kept at 180 °C for 12 hours, and finally cooled to room temperature naturally, the FTO conductive glass is taken out, washed with water and ethanol in sequence, and then dried. Then the obtained film was calcined at 500° C. for 1 hour to obtain an electrochromic film with a tungsten oxide nanoribbon structure. Figure 7 For the scanning electron microgra...

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Abstract

The invention discloses a tungsten oxide nano-belt structure electrochromic film preparation method, which specifically comprises: (1) dissolving a certain amount of secondary tungsten amino acid and oxalic acid dihydrate in anhydrous ethanol, and carrying out ultrasonic oscillation to obtain a reaction solution; and (2) immersing a FTO electric conduction glass in a hydrothermal kettle filled with the reaction solution, carrying out thermal insulation, naturally cooling to a room temperature, washing sequentially with water and ethanol, drying, and calcining to obtain the tungsten oxide nano-belt structure electrochromic film. According to the present invention, the one-step hydrothermal without the assistance of the crystal seed layer is used, such that the preparation process is simple, and the cost is low; and the obtained tungsten oxide nanometer structure directly contacts the surface of the FTO electric conduction glass, such that the resistance of the crystal seed layer on the electron transmission can be eliminated, the electron transmission efficiency can be improved, and the electrochromic property of the film can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electrochromic thin film preparation, and in particular relates to a preparation method of an electrochromic thin film with a tungsten oxide nanobelt structure. Background technique [0002] Electrochromism refers to the phenomenon that materials produce stable and reversible changes under the action of electric field. When the material undergoes electrochemical injection and extraction of electrons and ions, its valence and chemical composition change, thereby changing the reflection and transmission properties of the material, and the appearance performance is manifested as a reversible change in color and transparency. . Since S. K. Deb first reported the electrochromic effect of amorphous tungsten oxide film in 1969, electrochromic thin film materials have become one of the hot spots in material research because of their special properties. Among them, inorganic metal oxides are the most well-studie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02C03C17/25
CPCC01G41/02C01P2002/72C01P2004/03C01P2004/17C01P2004/20C01P2004/30C01P2006/40C01P2006/60C03C17/25C03C2217/219C03C2218/111
Inventor 王金敏马董云李太良刘爽李菲
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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