al with mosaic structure 2 o 3 /wo 3 Nanocomposite electrochromic film and preparation method thereof

Abstract

The invention discloses a preparation method of an Al2O3 / WO3 nano composite electrochromic film having a mosaic structure. The preparation method comprises the following steps: 1) dissolving Al2O3 nanoparticle powder in water through ultrasonic dispersion to form an Al2O3 nanoparticle water solution; 2) adding ammonium metatungstate into the Al2O3 nanoparticle water solution, performing ultrasonic treatment to form a precursor composite solution; 3) adding ethanol and polyethyleneglycol into the precursor composite solution, and performing ultrasonic treatment to regulate the viscosity and surface tension of the solution; 4) preparing a wet film on a conductive substrate through a spin coating method or a pulling method or a spray coating method; and 5) performing heat treatment on the wet film in air to obtain the Al2O3 / WO3 nano composite electrochromic film. The invention also discloses the Al2O3 / WO3 nano composite electrochromic film prepared through the above method. The preparation method disclosed by the invention is simple, can easily realize film forming on various substrates of different shapes, is low in material consumption and is low in cost, thereby being suitable for industrial production.

Description

technical field [0001] The invention relates to the field of electrochromic energy-saving composite thin films, in particular to an Al with a mosaic structure 2 o 3 / WO 3 Nanocomposite 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 can be traced back to 1966 when Deb studied the non-granular 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 m...

AI Technical Summary

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 of the film, 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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