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Polystyrene pellets used as soft templates to prepare porous structures vo 2 thin film method

A technology of polystyrene spheres and porous structure is applied in the field of preparing porous structure VO2 thin films, which can solve the problems of single method and reduce the phase transition temperature of the thin film, and achieve the effects of low preparation process cost, reduced reflection and reduced phase transition temperature.

Active Publication Date: 2020-04-28
CHINA TRIUMPH INT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Visible VO 2 The phase transition temperature of glass is 68°C, which is quite different from the temperature of our living environment. Such thin film glass is not very meaningful for our application, so one of the problems that people have been studying is how to reduce VO 2 The phase transition temperature of the thin film can basically be solved today, but the method used by the researchers is relatively simple, that is, through the VO 2 How to reduce the phase transition temperature of the film in other ways without doping has been rarely studied

Method used

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  • Polystyrene pellets used as soft templates to prepare porous structures vo <sub>2</sub> thin film method
  • Polystyrene pellets used as soft templates to prepare porous structures vo <sub>2</sub> thin film method
  • Polystyrene pellets used as soft templates to prepare porous structures vo <sub>2</sub> thin film method

Examples

Experimental program
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Embodiment 1

[0027] Weigh 6.0g chemically pure coarse crystal vanadium pentoxide (V 2 o 5 ), ground and mixed with 8.9g of analytically pure oxalic acid (C 2 h 2 o 4 ) into 200ml of absolute ethanol, stir in a beaker until all the raw materials are dissolved, add 1.5g of polyvinylpyrrolidone (PVP), stir for 20min, transfer the solution into a four-neck flask, heat and stir in an oil bath at 120°C for 12h, then add dispersing 15ml of absolute ethanol emulsion with polystyrene beads was added dropwise to 5.0ml of absolute ethanol solution of surfactant P123, and the stirring was continued at room temperature until a uniform emulsion sol was formed. Coating by spin coating method, spin coating at 2500r / min for 20s to obtain a wet film, drying in an oven at 100°C for 10min, and then drying in N 2 Under the protection of gas atmosphere, the porous structure of VO was obtained by holding it at 550°C for 30 minutes. 2 film.

[0028] figure 1 VO prepared for this example 2 Thin film XRD pa...

Embodiment 2

[0030]This embodiment is a comparative experiment of embodiment 1.

[0031] Weigh 6.0g chemically pure coarse crystal vanadium pentoxide (V 2 o 5 ), ground and mixed with 8.9g of analytically pure oxalic acid (C 2 h 2 o 4 ) into 200ml of absolute ethanol, stir in a beaker until all the raw materials are dissolved, add 1.5g of polyvinylpyrrolidone (PVP), stir for 20min, transfer the solution into a four-necked flask, heat and stir in an oil bath at 120°C for 12h to obtain a coating precursor Sol. Coating by spin coating method, spin coating at 2500r / min for 20s to obtain a wet film, drying in an oven at 100°C for 10min, and then drying in N 2 VO 2 film.

[0032] figure 2 VO prepared for this example 2 Thin film SEM pictures. Figure 4 VO prepared for this example 2 Hysteresis curves of thin film phase transition properties.

[0033] Comparing the phase transition characteristic curves of Example 1 and Example 2, it can be found that the phase transition temperature...

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Abstract

The invention provides a method for preparing a porous-structure VO2 film with a polystyrene bead as a soft template. The method comprises the following steps: dissolving vanadium pentoxide (V2O5) and analytically pure oxalic acid (C2H2O4) in absolute ethyl alcohol and carrying out stirring in a beaker until the raw materials are totally dissolved; adding a small amount of polyvinylpyrrolidone (PVP) and carrying out stirring for 20 to 40 min; then transferring the obtained solution into a four-mouth flask and carrying out heating and stirring in an oil-bath pot with a temperature of 120 to 150 DEG C for 12 to 16 h; adding absolute ethyl alcohol emulsion in which the polystyrene bead is dispersed, adding a certain amount of an absolute ethyl alcohol solution of a surfactant P123 drop by drop and continuing stirring at room temperature until a uniform emulsion sol is formed; and after preparation of a wet film, drying the wet film in a baking oven at 100 to 150 DEG C for 10 to 30 min and maintaining the film at a temperature of 450 to 650 DEG C for 20 to 30 min under the protection of an Ar or N2 atmosphere so as to obtain the porous-structure VO2 film; wherein a mol ratio of the raw material V2O5 to the raw material C2H2O4 is 1: 3 to 1: 6, and the emulsion in which the soft template polystyrene bead is added accounts for 6 to 18% of the total volume of the sol.

Description

technical field [0001] The invention relates to a thin film material with a thermally induced phase change function and a preparation method thereof, specifically a polystyrene pellet used as a soft template to prepare a porous structure VO 2 thin film method. Background technique [0002] Vanadium dioxide is a material with phase change function, which has great application prospects in the field of intelligent temperature control of glass doors and windows. When VO 2 When the temperature of thin film glass rises to 68°C, a transition from monoclinic rutile phase to tetragonal rutile phase will occur, which can be understood as VO 2 The distortion of the lattice is the displacement of the atoms. This phase change brings a series of changes in the photoelectric properties of the thin film material, that is, at low temperature, the material can allow the heating infrared light to transmit with a high transmittance. When the indoor temperature reaches a certain temperature,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/23
Inventor 汤永康金良茂王萍萍操芳芳甘治平
Owner CHINA TRIUMPH INT ENG
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