Preparation method of color-variable and cyclically stable PANI electrochromic film

Abstract

The invention discloses a preparation method of a color-variable and cyclically stable PANI electrochromic film and belongs to the field of technical application of functional materials. The preparation method comprises the following steps: preparing an ethanol solution of sulfuric acid, and adding an aniline monomer to obtain an electro-deposition PANI precursor solution; performing electro-deposition by use of the electro-deposition PANI precursor solution; performing cyclic voltammetry measurement by taking the ethanol solution of sulfuric acid as an electrolyte. At different voltages, the color of a polyaniline film varies and turns into green from pale yellow and to blue. The PANI film prepared by the invention has high cyclic stability and high uniformity.

Description

technical field [0001] The invention relates to a preparation method for preparing a PANI thin film in a large area, and belongs to the technical application field of functional materials. Background technique [0002] At present, environmental and energy issues are two major issues faced by countries all over the world. It is imperative to save energy and reduce energy consumption. As a new type of green, energy-saving and low-carbon functional material, electrochromic materials can be widely used in display devices, smart windows, energy-saving buildings, national defense and military camouflage, etc., and have attracted great attention. Electrochromism refers to the co-injection and co-extraction of ions and electrons under the action of an electric field, which causes reversible changes in the valence state and chemical composition of the material, thereby changing the transmission and reflection characteristics of the material. The materials used in the electrochromic ...

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Problems solved by technology

However, there are technical limitations in the preparation of polyaniline electrochromic film at present, such as extremely poor solubility, almost insoluble in common organic solvents, and even more difficult to dissolve in water; organic matter is unstable and poor in cycle stability; it does not melt at the decomposition temperature , difficult to melt processing, etc., which greatly limit its practical application

The most commonly used method of preparing polyaniline film is the sol-gel method at present, but there are a large number of micropores in the gel, there are often gases and organic matter in the drying process, and shrinkage; and the time required for the sol-gel method process is relatively long. Long, often days or weeks

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