Sunlight-driven thermochromic material and preparation method thereof

Abstract

The invention discloses a preparation of a sunlight-driven thermochromic material. The preparation comprises the following steps: synthesizing different resonance wavelengths of gold nanoparticles by utilizing a seed-growth solution method, preparing a gold nanoparticle water solution after mixing, and enabling an absorption spectrum of the gold nanoparticle water solution to be consistent with a sun emission spectrum; synthesizing diacetylene vesicles by utilizing a heating-ultrasound-self assembly method, inducing a topology reaction under ultraviolet light of which the wavelength is 254 nm, and forming a polydiacetylene vesicle colloidal solution; mixing the gold nanoparticle water solution and the polydiacetylene vesicle colloidal solution with a polyvinyl alcohol solution obtained through heating dissolution, preparing a thin film, and airing in a shade and ventilated place under room temperature, thus obtaining the sunlight-driven thermochromic material. According to the preparation disclosed by the invention, the defect of an existing thermochromic material that a heat source is required to be additionally added is abandoned, the sunlight is directly utilized as a driving force, and a thermochromic material is changed into sunlight-controlled photochromic material; the temperature of a photothermal conversion effect is controllable, discoloration is sensitive, the contrast is large, application of the sunlight-driven thermochromic material is more convenient and relaxed, and the application field of the sunlight-driven thermochromic material is broadened.

Description

technical field [0001] The invention relates to a color-changing material, in particular to a photothermal conversion effect of noble metal nanoparticles to drive the color-changing behavior of the material under sunlight irradiation, and belongs to the field of nanometer materials. Background technique [0002] Noble metal nanoparticles (such as gold and silver) have specific surface plasmon optical properties, and have been widely used in the fields of surface-enhanced Raman scattering and surface-enhanced fluorescence spectroscopy in recent years. Another property with great application potential of localized surface plasmons of noble metals is their extremely high light-to-heat conversion efficiency. Noble metal nanoparticles convert the absorbed light energy into the kinetic energy of electronic resonance, and then convert this energy into the vibration energy of the lattice through the scattering of electrons by the lattice. The vibration energy of the crystal lattice...

AI Technical Summary

Problems solved by technology

For traditional thermochromic materials, it requires an external heat source to drive the color change behavior of the material, which will undoubtedly increase the volume or complexity of the device during application

In order to solve this problem, people focus on how to match the discoloration temperature of the color-changing material with the temperature of the application environment, and in the process of modifying the material, the original excellent optical properties of the material will be reduced.

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