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A preparation method of vanadium dioxide film with heat-reflectivity response

A vanadium dioxide and reflectivity technology, applied in the field of vanadium dioxide thin film and its preparation, can solve the problems of inability to adjust negative temperature feedback and high phase transition temperature, and achieve stable time-consuming, strong chemical stability, and good thermo-optical response. performance effect

Active Publication Date: 2020-02-21
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the phase transition temperature of vanadium dioxide is too high to be used for temperature negative feedback regulation in greenhouses, and to provide a vanadium dioxide with a phase transition temperature of 38°C, which uses glass fiber as a carrier and has a heat-reflectivity response. The preparation method of vanadium oxide thin film; the present invention utilizes glass fiber cloth as carrier, utilizes sol-gel method, loads multi-layer colloid thin film on its surface, then sinters

Method used

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  • A preparation method of vanadium dioxide film with heat-reflectivity response
  • A preparation method of vanadium dioxide film with heat-reflectivity response
  • A preparation method of vanadium dioxide film with heat-reflectivity response

Examples

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Effect test

Embodiment 1

[0042] Choose 100m 2 / g Alkali-free E-type glass fiber cloth as the carrier, first place the carrier in a muffle furnace for heat treatment at 500°C for 2 hours to remove the sizing agent on the surface of the glass fiber, and then ultrasonicate the treated glass fiber cloth for 1 hour to further remove Sizing remaining on glass fiber surface. Will 5g V 2 o 5 The powder was placed in a muffle furnace and heated at 800 °C for 30 min to obtain molten V 2 o 5 , quickly poured into 300ml cold distilled water for quenching, stirred for 10min, and filtered to remove the residue to obtain a brown sol solution. The main component of the sol solution solute is H x V 2 o 5. Soak the pre-treated glass fiber cloth in the prepared sol solution for 10 seconds, then place the glass fiber in an oven for drying. The temperature of the oven is set at 60°C. Repeat the above operation 10 times to obtain a dark brown glass fiber cloth. Clamp the dark brown fiberglass cloth quartz piece int...

Embodiment 2

[0044] Choose 120m 2 / g Alkali-free E-type glass fiber cloth is used as the carrier. First, the carrier is placed in a muffle furnace for heat treatment at 450°C for 3 hours to remove the sizing agent on the surface of the glass fiber, and then the treated glass fiber cloth is ultrasonicated for 2 hours to further remove Sizing remaining on glass fiber surface. Will 5g V 2 o 5 The powder was placed in a muffle furnace and heated at 750 °C for 40 min to obtain molten V 2 o 5 , quickly poured into 100ml cold distilled water to quench, stirred for 10min, and filtered to remove the residue to obtain a brown sol solution. The main component of the sol solution solute is H x V 2 o 5 . Soak the pretreated glass fiber cloth in the prepared sol solution for 8 seconds, then place the glass fiber in an oven for drying, the oven temperature is set at 55°C, and repeat the above operation 8 times to obtain a dark brown glass fiber cloth. Clamp the dark brown fiberglass cloth quartz ...

Embodiment 3

[0046] Choose 80m 2 / g non-alkali E-type glass fiber cloth as the carrier, first place the carrier in a muffle furnace for heat treatment at 550°C for 1 h to remove the sizing agent on the surface of the glass fiber, and then ultrasonicate the treated glass fiber cloth for 1.5 h, further Remove the sizing remaining on the surface of the fiberglass. Will 5g V 2 o 5 The powder was placed in a muffle furnace and heated at 850 °C for 20 min to obtain molten V 2 o 5 , quickly poured into 500ml cold distilled water for quenching, stirred for 10min, and filtered to remove the residue to obtain a brown sol solution. The main component of the sol solution solute is H x V 2 o 5 . Soak the pretreated glass fiber cloth in the prepared sol solution for 12 seconds, then arrange the glass fiber in an oven for drying, the oven temperature is set at 65°C, and repeat the above operation 12 times to obtain a dark brown glass fiber cloth. Clamp the dark brown fiberglass cloth quartz piece...

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Abstract

The invention discloses a method for preparing a vanadium dioxide film with thermal-reflectivity response. The method comprises the steps of pretreating glass fibers, dipping a precursor solution and sintering dipped glass fiber cloth. According to the method, the prepared vanadium dioxide film has good thermal-optical response performance and has sudden change of reflectivity at the temperature about 38 DEG C. The reflectivity is at a high level when the temperature is below 38 DEG C, the reflectivity is at a low level when the temperature is above 38 DEG C, and this property is reversible. The vanadium dioxide film can be applied to negative feedback adjustment on temperature in a greenhouse by using the thermal-reflectivity response of the vanadium dioxide film, so that the indoor temperature can be maintained to about 38 DEG C, and the development of plants in the greenhouse is facilitated. The method, which takes the glass fiber cloth as a carrier, for preparing the vanadium dioxide film with the thermal-reflectivity response, disclosed by the invention, has the advantages of energy saving, cheapness, safety, simplicity, stability, short consumed time and the like.

Description

technical field [0001] The invention relates to a vanadium dioxide film and a preparation method thereof, in particular to a preparation method of a vanadium dioxide film with a heat-reflectance response using glass fiber as a carrier. Background technique [0002] Vanadium dioxide thin films have attracted extensive attention because of their relatively low phase transition temperature (about 68°C). Its phase change rate is extremely fast near the phase change temperature. After the phase change occurs, its optical properties, electrical properties, thermal conductivity, and magnetic permeability will undergo sudden changes. It has very high application value. However, its phase transition temperature is much higher than room temperature, so it cannot be used for temperature negative feedback regulation in greenhouses. [0003] The methods for preparing vanadium dioxide thin films mainly include chemical vapor deposition (CVD), ion sputtering, and sol-gel method. The sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/82C04B35/495C04B35/622
CPCC04B35/495C04B35/62218C04B35/82C04B2235/9646
Inventor 张旺蔡年进吴丽萍孙鹏顾佳俊刘庆雷张荻
Owner SHANGHAI JIAOTONG UNIV
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