Method for preparing organic composite WO3 electrochomeric films

Abstract

The invention provides a method for preparing organic composite WO3 electrochomeric films. The method comprises the following steps: firstly, adding ammonium para-tungstate and polyethylene glycol to deionized water to obtain precursor sol; soaking ITO (indium tin oxide) glass substrates to the precursor sol, taking the ITO glass substrates out, drying and calcining to obtain mesoporous WO3 films on the ITO glass substrates; adding aniline and o-phenylenediamine to a hydrochloric acid solution, and stirring until the aniline and o-phenylenediamine dissolve, so as to obtain a mixed solution; putting the ITO glass into the mixed solution, then adding ammonium persulfate to the mixed solution, and pulling the ITO glass out after the polymerization reaction is completely conducted; and subjecting the ITO glass to deionized water washing and alcohol washing and holding at a room temperature to obtain the organic composite WO3 electrochomeric films. The organic composite WO3 electrochomeric films prepared by the invention are characterized by using porous WO3 films as substrates and poly(aniline / o-phenylenediamine) as an organic layer, for the WO3 film is the inorganic electrochomeric material with the best performance in the prior art and has the advantages of stable performance and long service life, while the poly(aniline / o-phenylenediamine) film has the advantages of short response time and good cyclic reversibility.

Description

technical field [0001] The invention relates to a preparation method of an electrochromic film, in particular to an organic composite WO 3 Preparation method of electrochromic thin film. Background technique [0002] According to the different conditions that lead to discoloration, the color-changing materials can be divided into electrochromic materials, thermochromic materials, photochromic materials, aerochromic materials, and the like. The so-called electrochromism refers to the stable and reversible change of the color or transparency of the material under the action of an applied voltage or electric field. Electrochromic film has the advantages of low working voltage, low energy consumption, no visual restriction, memory function, wide working range, energy saving and environmental protection, and easy large-scale production. It has a wide range of applications in the fields of display devices, dimming glass, and information storage. Application prospects. Electroch...

AI Technical Summary

Problems solved by technology

The light absorption change of organic electrochromic materials comes from oxidation-reduction reactions. Its response time is short (up to femtosecond level), rich in color, high in contrast, easy to carry out molecular design, and it can maintain the color changing effect after power off, and has a memory effect. However, its stability is poor and its life is short

The light absorption change of inorganic electrochromic materials is caused by the double injection / extraction of ions and electrons, and its performance is superior and stable. Among them, WO 3 Electrochromic thin films are widely used due to their superior performance, but they still have disadvantages such as single color and long response time.