TiO2/WO3 composite electrochromic film with nano embedded structure and preparation method of TiO2/WO3 composite electrochromic film

Abstract

The invention discloses a TiO2 / WO3 composite electrochromic film with a nano embedded structure and a preparation method of the TiO2 / WO3 composite electrochromic film. The preparation method comprises the following steps: 1) dissolving TiO2 nanocrystalline powder in water, and forming a TiO2 nanocrystalline aqueous solution; 2) adding ammonium metatungstate into the TiO2 nanocrystalline aqueous solution, and performing ultrasonic treatment to form a precursor composite solution; adding ethanol and polyethylene glycol into the precursor composite solution, and performing ultrasonic treatment so as to regulate the viscosity and surface tension of the solution; 4) preparing a wet film on a conductive substrate by adopting a spin-coating method or a pulling method or a spray method; and 5) performing heat treatment on the wet film in air, thereby obtaining the TiO2 / WO3 composite electrochromic film. The invention further discloses a TiO2 / WO3 composite electrochromic film prepared by utilizing the preparation method. The preparation method disclosed by the invention is simple, capable of easily forming films on various substrates of different shapes, less in used materials, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of electrochromic energy-saving composite thin films, in particular to a TiO with a nano-mosaic structure 2 / WO 3 Composite electrochromic thin film and preparation method thereof. Background technique [0002] The so-called electrochromism refers to a stable and reversible change in the color or transmittance of a material under the action of an applied voltage or electric field. The research on the electrochromic effect dates back to 1966 when Deb studied amorphous WO 3 Since then, scholars at home and abroad have conducted in-depth and extensive research on electrochromic thin films and their applications. At present, electrochromic materials are considered to be one of the most promising smart materials, and have great potential application value in smart windows, automotive anti-glare rearview mirrors, and electrochromic displays. [0003] Among many electrochromic materials, WO 3 As the most common inorgani...

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Problems solved by technology

General WO 3 The preparation methods of thin films include chemical vapor deposition, radio frequency sputtering, and some wet chemical methods, such as sol-gel, spray pyrolysis, and WO prepared by these methods 3 Due to the relatively dense structure and low chemical activity of thin films, the migration of ions or electrons is affected, and the spectral modulation amplitude is often not high, the response time is long, and the color changing efficiency is not high.

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