Preparation method and application of thermochromic film based on hollow VO2 nanoparticles

Abstract

The invention relates to a method for preparing a thermochromic film based on hollow VO2 nanoparticles with the particle size of 100 nm or below on a glass substrate and a flexible substrate, application and a preparation method of the hollow VO2 nanoparticles with the particle size of 100 nm or below, and the hollow VO2 nanoparticles with the particle size of 100 nm or below can be stacked and then applied to the glass substrate. The hollow VO2 nanoparticles below 100nm can also be dispersed into resin and applied to the flexible substrate, so that the application range of the thermochromic film is wider; the prepared thermochromic film can well realize high heat permeability at a low temperature in infrared invisible light, and can ensure high heat blocking capacity at a high temperature.

Description

technical field [0001] The invention relates to the preparation of a hollow VO below 100nm on a glass substrate and a flexible substrate. 2 Methods and applications of thermochromic thin films of nanoparticles, and hollow VO below 100nm 2 Methods for the preparation of nanoparticles. Background technique [0002] According to statistics, in today's increasingly tense energy environment, building energy consumption accounts for one-third of the total human energy consumption, and nearly half of building energy consumption is indirectly generated through windows; with the continuous development of technology, smart energy saving The emergence of windows has improved this phenomenon. Smart energy-saving windows can automatically adjust the light transmittance to sunlight, making the room warm in winter and cool in summer, reducing the use of temperature control equipment and saving energy. [0003] Intelligent energy-saving windows use materials with variable optical properti...

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Problems solved by technology

[0004] Currently VO 2 The preparation methods of thin films mainly include magnetron sputtering method, pulsed laser deposition method, chemical vapor deposition (CVD) method, sol-gel method, hydrothermal method, etc., but the dense VO prepared by the above methods 2 The high refractive index of the film and the low transmittance of visible light lead to insufficient visual transparency, which is also one of the main reasons for limiting its application; in order to solve this problem, the main method at present is in VO 2 A layer of low refractive index film is coated on the outside of the film to construct a multi-layer film, or for VO 2 The microstructure is adjusted to reduce its refractive index, and the synthesis of hollow VO 2 Nanoparticles are one of the important methods to reduce the refractive index of inorganic oxides

[0005] Hollow VO 2 The particle size of nanoparticles determines the application in the field of smart energy-saving windows. If the particle size is too large, it cannot be used in it. At present, the hollow VO 2 The particle size of the particle size is several microns, which cannot meet the requirements of the particle size of the smart energy-saving window less than 100nm. 2 nanoparticle approach

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