Vanadium dioxide thin film having regular truss network structure and preparation method thereof

A technology of vanadium dioxide and network structure, which is applied in the field of vanadium dioxide film preparation, can solve the problems of easy oxidation of organic additives, complex preparation process, and difficulty in forming large-area films, and achieve excellent thermal resistance modulation ability, strong The effect of thermal radiation modulation performance and excellent thermally induced phase transition performance

Inactive Publication Date: 2016-06-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation methods often have disadvantages such as complex preparation process, high cost, difficulty in forming a large-area film, unstable performance, etc., and cannot really meet the needs of marketization.
Among them, the hydrothermal method is considered to be the lowest cost and the easiest method to be popularized successfully by preparing the powder and then compounding the thin film formed by the organic additive. However, the powder arrangement is disorderly and random accumulation, and the nanostructure cannot be realized. control
The visible light transmittance of this type of film is usually lower than 60%, which cannot meet daily needs
In addition, organic additives are easily oxidized and affect VO 2 Performance and so on all limit VO 2 market application of

Method used

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  • Vanadium dioxide thin film having regular truss network structure and preparation method thereof
  • Vanadium dioxide thin film having regular truss network structure and preparation method thereof
  • Vanadium dioxide thin film having regular truss network structure and preparation method thereof

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[0039]The invention provides a method for preparing a vanadium dioxide film with a regular truss network structure. refer to figure 1 , which shows a flow chart of a method for preparing a vanadium dioxide film with a regular truss network structure according to Example 1 of the present invention, the method comprising the following steps:

[0040] Step 101, preparation of the primary vanadium dioxide thin film.

[0041] Preparation of Solution 1: Heat and stir the vanadium-containing solid compound, oxalic acid and distilled water to mix until completely dissolved to obtain Solution 1.

[0042] Preparation of solution 2: add distilled water to the solution 1, and then add at least one of monohydric alcohol and dihydric alcohol to obtain solution 2; wherein, add at least one of the monohydric alcohol and dihydric alcohol in the solution 1 The volume ratio of the volume to the distilled water is 0:1 to 3:1, so that the concentration of vanadium ions in the solution 2 is 0.002...

Embodiment 1

[0070] A specific method for preparing a vanadium dioxide film with a regular truss network structure may include:

[0071] (1) Preparation of primary vanadium dioxide thin film.

[0072] Place 3.56g of V 2 o 5 powder and 2 times the V 2 o 5 The oxalic acid of mole number is mixed in 100ml distilled water, uses the water-bath magnetic stirrer to heat and stir the described vanadium-containing solid compound, the described oxalic acid and the described distilled water mixture to dissolve completely, place in the water-bath magnetic stirrer and heat and stir to dissolve, and the heating temperature is 50°C, stirred and reacted for 48 hours to obtain a dark blue solution of vanadyl oxalate, that is, solution 1.

[0073] Take 1ml of solution 1, add 99ml of deionized water (volume ratio of alcohol to water is 0:1), and make 100ml of solution 2, the vanadium ion concentration is 0.004mol / L, and the pH value of solution 2 is 1 at this time.

[0074] Take 40ml of solution 2 and p...

Embodiment 2

[0089] A specific method for preparing a vanadium dioxide film with a regular truss network structure may include:

[0090] (1) Take 1ml of the solution 1 prepared in Example 1, add 199ml of deionized water (the volume ratio of alcohol to water is 0:1), and make 200ml of solution 2, the concentration of vanadium ions is 0.002mol / L, and use ammonia water to dissolve the solution 2 The pH was adjusted to 2.4.

[0091] Take 40ml of the pH-adjusted solution 2 and place it in a reaction kettle equipped with 50ml of p-polyphenylene for hydrothermal reaction, put the C-axis oriented alumina substrate in the reaction kettle, and seal the reaction kettle well Finally, place it in a drying oven, keep it warm at 230°C for 4 hours, the upper liquid in the reaction kettle is clarified, and the hydrothermal reaction is completed;

[0092] (2) After the hydrothermal reaction is completed, the supernatant liquid in the reaction kettle is poured out, and a uniform blue-black film is obtained ...

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Abstract

The invention provides a vanadium dioxide thin film having a regular truss network structure and a preparation method thereof. The vanadium oxide thin film is an M phase and has the regular truss network structure formed by uniformly connecting nanorods, wherein the nanorods are each of a monocrystal structure, the length of crystal grains is 200-500 nm and the width of the crystal grains is 30-60 nm. The method includes the steps: step (1), preparation of an initial product of the vanadium dioxide thin film; step (2), preparation of a semi-finished product of the vanadium dioxide thin film, and step (3), preparation of the vanadium oxide thin film. The vanadium dioxide thin film prepared by the method provided by the embodiment of the invention has excellent thermal induced phase transition performance and excellent heat induced resistance modulation capability, and also has relatively high visible light transmittance rate and relatively strong thermal radiation modulation performance. At the same time, the thin film morphology, size and density are effectively controlled through controlling reaction conditions, and the preparation method has the advantages of simple process, large-area production, easily obtained raw materials, low cost and the like and is suitable for use in industrialization.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and in particular relates to a vanadium dioxide film with a regular truss network structure and a preparation method for the vanadium dioxide film with a regular truss network structure. Background technique [0002] Vanadium dioxide (VO 2 ) is a typical strongly electron-correlated compound. There is a metal-insulator transition (MIT) at 68°C, and a reversible phase transition from M phase (monoclinic phase) to R phase (tetragonal rutile structure) occurs, and its phase transition response speed is extremely high. Fast, up to the order of tens of fs, the resistivity, light transmittance and reflectance before and after the phase transition change suddenly. The change range of resistivity can be as high as 4 to 5 orders of magnitude, and the light transmittance in the infrared region also changes greatly. low temperature semiconducting VO 2 The film is in a state of high transmiss...

Claims

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Application Information

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IPC IPC(8): C04B41/50
CPCC04B41/5072C04B41/4535C04B41/455
Inventor 李静波张家嵩金海波王林张瑞博郭德宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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