Process and method for preparing thermochromic radiation refrigeration type intelligent window

Abstract

The invention relates to a preparation process and method for preparing core-shell nanoparticles and a polymer (PVP) film on a substrate of a common glass slide, wherein the core-shell nanoparticles are coated with tungsten-doped vanadium dioxide nanoparticles on the surface of silicon dioxide, and the process sequentially comprises the following steps of: pretreating a silicon dioxide and tungsten-doped vanadium dioxide core-shell structure and preparing a PVP mixed solution; the method comprises the basic operation procedures of ethanol dispersion of the core-shell structure, PVP dispersion, setting of stirring parameters, spin-coating parameters, drying parameters and the like. The invention also relates to an application of the core-shell nanoparticles and a polymer (PVP) film which are prepared on a substrate of a common glass slide and are coated with tungsten-doped vanadium dioxide nanoparticles on the surface of silicon dioxide in the fields of intelligent windows, infrared stealth, energy-saving glass and radiation refrigeration in the aspects of adjustable transmittance and adjustable radiation capability. The problems that a traditional vanadium dioxide nanoparticle film is low in visible light transmittance, poor in near-infrared modulation capacity, reverse in infrared radiance and the like are solved.

Description

Technical Field

[0001] The present invention relates to the field of microelectronic device preparation, and in particular to a radiation cooling type smart window that realizes thermochromic change by utilizing the principle of multiple scattering; specifically, a process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on an ordinary glass slide substrate is creatively proposed. Technical Background

[0002] Building energy consumption accounts for more than one-third of the total energy consumption of society, and the energy consumption caused by windows accounts for about 65% of the energy consumption of buildings. Therefore, reducing the energy consumption of windows can significantly reduce the total energy consumption of buildings. One countermeasure is to use thermochromic smart window technology, which can automatically adjust the solar energy transmittance according to temperature changes, thereby effectively reducing the energy consumption of windows. In addition, there is a thermal management technology called radiative cooling, the principle of which is to radiate the heat energy released by the building to the cold outer space to achieve heat cooling. Combining these two technologies can flexibly manage the input of solar energy and the output of heat, providing a practical solution for reducing energy consumption. In addition, the traditional single tungsten-doped vanadium dioxide nanoparticles mixed with polymers cannot achieve positive regulation of the radiation band before and after the phase change and the modulation efficiency is low.

[0003] Tungsten-doped vanadium dioxide (VO2) nanoparticles will undergo a metal-semiconductor phase transition at a phase transition temperature of about 40°C, accompanied by a sudden change in electrical, mechanical, magnetic and optical properties; silicon dioxide nanoparticles have good visible light transmittance and a large specific surface area. Therefore, the core-shell structure can ensure the amount of vanadium dioxide and the ideal light path. PVP can be used not only as a dispersant but also as a transparent material to support the uniform distribution of core-shell nanoparticles in the coating, providing a reliable performance guarantee for thermochromic radiation cooling smart windows. With the development of microelectronic devices towards miniaturization and industrial simplification, spin coating has become a research hotspot in the field of improving the performance of microelectronic devices.

[0004] Traditional thin film coating preparation methods mainly include one-time preparation methods such as pressing, smearing and rolling. The high requirements for process conditions during the preparation process hinder its development towards industrialization, low cost and miniaturization. Therefore, optimizing the traditional preparation process and developing a high-visibility, multi-band adjustable, high-quality, low-cost and high-performance adjustable device preparation process has become an urgent problem to be solved. Summary of the invention 1. Technical issues to be resolved In view of the many deficiencies of the devices currently prepared based on vanadium dioxide materials used in microelectronic fields such as smart windows and radiation cooling, the present invention provides a preparation process and method for preparing silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticles core-shell nanoparticles and a polymer (PVP) film on an ordinary glass slide substrate, including the dispersion preparation of a core-shell structure solution formed by the silicon dioxide surface and tungsten-doped vanadium dioxide nanoparticles, utilizing the Mie scattering of the core-shell structure in the far-infrared band after phase change to improve the radiation modulation ability of the core-shell structure in the atmospheric window, and utilizing the localized plasma resonance between the core-shell structure nanoparticles to improve the modulation ability in the solar energy band, thereby promoting the development of microelectronic devices. (II) Technical solution In order to achieve the above object, the present invention provides a preparation process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide, characterized in that it comprises the following steps: Step 1: First, use acetone solution, anhydrous ethanol and deionized water to clean the beaker, medicine spoon, glass substrate, mortar and magnet, etc., ultrasonically clean for 15 minutes each, and finally put them in an oven to dry for 10 minutes; Step 2: 100 mg of the core-shell structure of silicon dioxide and tungsten-doped vanadium dioxide particles were weighed using a high-precision electronic scale, and then added into a beaker containing 1 ml of ethanol solution and stirred at a low speed for 3 h; Step 3, weigh 40 mg of PVP powder with a high-precision electronic scale, add it to the mixed solution in step 2, continue stirring for 12 hours, and place it in water at a temperature of 50°C; Step 4, cut the glass slide into 2.5*2.5 cm substrates, place them on the sample tray of the gel-spinning machine, and drop 20 μL of the solution prepared in step 3 on the substrates; Step 5. Before starting spin coating, set the parameters of the glue machine to low speed 500r / min, running time 10s, high speed 2500r / min, running time 20s; Step 6: After the spin coating is completed, the sample is quickly placed in an oven for drying, and the drying parameters are set to 70°C for 20 minutes; Step 7: After drying, characterize the optical properties and morphological characteristics. The advantage of the present invention is that a thermochromic layer structure of a glass substrate is successfully prepared, and its transmittance in the visible light band and its adaptive modulation capability from near infrared to far infrared are enhanced. The radiation cooling type smart window structure of the present invention not only maintains its visible light transmittance, but also enhances its adaptive temperature modulation capability of the thermal radiation of the solar energy and atmospheric window, further promoting the development of thermochromic in the field of smart windows and radiation cooling. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 The present invention is a flowchart of a process and method for preparing tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticles and a polymer (PVP) film coated with a silicon dioxide surface on a common glass slide substrate according to an embodiment of the present invention. Figure 2 This is a visible infrared spectrum diagram of the radiation cooling type smart window structure prepared in the present invention. Figure 3 This is a scanning electron microscope image of the radiation cooling smart window structure prepared by the present invention. Figure 4 This is a conceptual diagram of the radiation cooling smart window structure prepared by the present invention. Figure 5 This is a physical picture prepared by the present invention.

Explanation of symbols

Claims

1. A process and method for preparing a silicon dioxide surface coated with tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticles and a polymer (PVP) film on an ordinary glass slide substrate, wherein the radiation cooling type smart window structure comprises a substrate (ordinary glass slide, silicon, etc.), silicon dioxide and tungsten-doped vanadium dioxide forming a core-shell structure nanoparticles and a PVP film, characterized in that A film composed of PVP and core-shell nanoparticles was prepared and creatively applied to smart windows and radiation cooling technology. The specific operation is as follows: Step 1: First, use acetone solution, anhydrous ethanol and deionized water to clean the beaker, medicine spoon, glass substrate, mortar and magnet, etc., ultrasonically clean for 15 minutes each, and finally put them in an oven to dry for 10 minutes; Step 2: 100 mg of the core-shell structure of silicon dioxide and tungsten-doped vanadium dioxide particles were weighed using a high-precision electronic scale, and then added into a beaker containing 1 ml of ethanol solution and stirred at a low speed for 3 h; Step 3, weigh 40 mg of PVP powder with a high-precision electronic scale, add it to the mixed solution in step 2, continue stirring for 12 hours, and place it in water at a temperature of 50°C; Step 4, cut the glass slide into 2.5*2.5 cm substrates, place them on the sample tray of the gel-spinning machine, and drop 20 μL of the solution prepared in step 3 on the substrates; Step 5. Before starting spin coating, set the parameters of the glue machine to low speed 500r / min, running time 10s, high speed 2500r / min, running time 20s; Step 6: After the spin coating is completed, the sample is quickly placed in an oven for drying, and the drying parameters are set to 70°C for 20 minutes; Step 7: After drying, characterize the optical properties and morphological characteristics.

2. A process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide according to claim 1, characterized in that: A core-shell structure is used to prepare a radiative cooling smart window structure.

3. A process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide according to claim 1, characterized in that: The core-shell structure used is composed of tungsten-doped vanadium dioxide and silicon dioxide nanoparticles. The size of the tungsten-doped vanadium dioxide nanoparticles is 50nm, and the size of the silicon dioxide nanoparticles is 3.5μm.

4. A process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide according to any one of claims 2 to 4, characterized in that: It is used in thermovariable dimming devices with a wavelength of 0.38μm-25μm, and is also used in but not limited to smart windows, radiation cooling, laser protection, infrared stealth and other applications.

5. A process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide according to claim 1, characterized in that: The mass ratio of the core-shell particles of the radiation cooling smart window, PVP and ethanol solution is 100mg:40mg:1ml.

6. A process and method for preparing a silicon dioxide surface-coated tungsten-doped vanadium dioxide nanoparticle core-shell nanoparticle and a polymer (PVP) film on a substrate of an ordinary glass slide according to claim 1, characterized in that: The transmittance of solar energy is ≥50%, the modulation efficiency is ≥8%, and the radiation rate modulation is ≥0.4.

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