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Preparation method for self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film

A seed crystal growth, nanostructure technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc. and other problems, to achieve the effect of improving the discoloration speed and coloring efficiency, which is beneficial to electron transmission and improving the coloring efficiency.

Inactive Publication Date: 2014-10-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electrochromic properties of these nanostructured tungsten oxide films have been improved, there are still many problems in practical applications, such as: (1) the preparation process is complicated, and it is difficult to meet the requirements of practical applications; (2) the coloring efficiency is low , poor energy efficiency
The reason is mainly in the following two aspects: First, the preparation of these nano-films needs to coat a layer of tungsten oxide seed crystal layer on the surface of FTO, and the seed crystal layer often requires a relatively complicated preparation process and annealing during the preparation process. Treatment will increase energy consumption, which does not meet the needs of the era of energy conservation and environmental protection; secondly, precisely because of the existence of the seed layer, the grain boundaries in the seed layer's fine nanocrystals will hinder electron transmission and reduce transmission efficiency, thereby affecting its coloring Efficiency, energy utilization is also relatively poor

Method used

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  • Preparation method for self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film
  • Preparation method for self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film
  • Preparation method for self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Soak the FTO conductive glass in detergent, deionized water, acetone and ethanol for 15 minutes and then dry it for later use. Weigh 5g of tungstic acid and dissolve it in 60mL of hydrogen peroxide, heat to 95°C, cool down after the tungstic acid is completely dissolved to obtain a transparent sol; dilute the transparent sol to 200mL with deionized water, take 10.5mL of the transparent sol, 3.5mL of hydrochloric acid (3mol / L), 10.5mL deionized water, and 31.5mL ethylene glycol were poured into the hydrothermal kettle, and the FTO conductive glass was immersed in the hydrothermal kettle, kept at 120°C for 2 hours, and finally cooled to room temperature naturally, and the FTO conductive glass was taken out. Wash with water and ethanol in sequence and dry. figure 1 It is the X-ray diffraction pattern of the prepared film, and it can be seen from the standard X-ray diffraction pattern that the film is an orthorhombic phase of WO 3 0.33H 2 O, corresponds to the standard c...

Embodiment 2

[0038] Soak the FTO conductive glass in detergent, deionized water, acetone and ethanol for 15 minutes and then dry it for later use. Weigh 5g of tungstic acid and dissolve it in 100mL of hydrogen peroxide, heat to 95°C, cool down after the tungstic acid is completely dissolved to obtain a transparent sol; dilute the transparent sol to 200mL with deionized water, take 10.5mL of the transparent sol, 3.5mL of hydrochloric acid (3mol / L), 10.5mL deionized water, and 31.5mL ethylene glycol were poured into the hydrothermal kettle, and the FTO conductive glass coated with the seed layer was immersed in the hydrothermal kettle, kept at 120°C for 1 hour, and finally cooled naturally to At room temperature, take out the FTO conductive glass, wash it with water and ethanol in sequence, and then dry it. Image 6It is the X-ray diffraction pattern of the prepared film, and it can be seen from the standard X-ray diffraction pattern that the film is an orthorhombic phase of WO 3 0.33H 2 O...

Embodiment 3

[0041] Soak the FTO conductive glass in detergent, deionized water, acetone and ethanol for 15 minutes and then dry it for later use. Weigh 5g of tungstic acid and dissolve it in 80mL of hydrogen peroxide, heat to 95°C, cool down after the tungstic acid is completely dissolved to obtain a transparent sol; dilute the transparent sol to 200mL with deionized water, take 10.5mL of the transparent sol, 3.5mL of hydrochloric acid (3mol / L), 14mL deionized water, and 28mL ethylene glycol were poured into the hydrothermal kettle, and the FTO conductive glass was immersed in the hydrothermal kettle, kept at 120°C for 2 hours, and finally cooled to room temperature naturally, the FTO conductive glass was taken out, and water and Wash with ethanol and then dry. Figure 11 It is the X-ray diffraction pattern of the prepared film, and it can be seen from the standard X-ray diffraction pattern that the film is an orthorhombic phase of WO 3 0.33H 2 O, corresponds to the standard card JCPDS5...

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Abstract

The invention relates to a preparation method for a self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film. The method comprises the following steps: (1) dissolving tungstic acid in hydrogen peroxide, carrying out heating until tungstic acid is completely dissolved and then carrying out cooling so as to obtain a transparent sol; and (2) diluting the transparent sol, preparing a reaction solution from the diluted transparent sol, hydrochloric acid, deionized water and glycol, then soaking FTO conductive glass cleaned with ultrasonic waves into a hydro-thermal kettle filled with the reaction solution, maintaining a temperature, then carrying out natural cooling to room temperature, carrying out cleaning with water and ethanol and then carrying out drying. The preparation method has the advantages of easiness, conservation of time and low cost. The self-seed-growing nest-like tungsten oxide hydrate nanostructured electrochromic film can eliminate crystal boundary obstructions, accelerate electron transport, improve electron transport efficiency and effectively enhance electrochromic performance like the electrochromic speed, coloring efficiency and cycling stability of the film, and has industrial application prospects in film formation on the surface of glass.

Description

technical field [0001] The invention belongs to the field of electrochromic thin films, in particular to a method for preparing a bird's nest-shaped hydrated tungsten oxide nanostructure electrochromic thin film grown from crystal seeds. Background technique [0002] Electrochromism is the reversible change in color of a material when a voltage is applied to it. Materials capable of reversible changes in optical properties (eg, color) based on electrochemical redox reactions are referred to as electrochromic materials. Tungsten oxide has become a research hotspot of electrochromism due to its excellent electrochromic properties. [0003] In recent years, with the development of nanomaterials prepared by hydrothermal technology, researchers hope to prepare electrochromic films with nanostructures by hydrothermal method to improve their electrochromic properties. J.P.Tu et al. reported a tungsten oxide nanowire array film in Journal of Materials Chemistry Vol.21(2011) pp.549...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/22C01G41/00B82Y30/00
Inventor 王宏志李海增李耀刚张青红
Owner DONGHUA UNIV
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