Method for adjusting band gap of vanadium dioxide film

A technology of vanadium dioxide and thin film, applied in vanadium oxide, coating and other directions, can solve the problems of unsuitability for large-scale production, high cost, complicated control process, etc., and achieve the effect of improving visible light transmittance and solar energy regulation ability

Inactive Publication Date: 2015-01-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0008] Vanadium dioxide thin films are usually prepared by sputtering, chemical vapor deposition, ion implantation, sol-gel methods, etc. However, these methods have disadvantages such as high cost, c

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  • Method for adjusting band gap of vanadium dioxide film
  • Method for adjusting band gap of vanadium dioxide film

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Example Embodiment

[0025] Preparation of Vanadium Dioxide Film with Adjustable Band Gap

[0026] The present invention uses alkaline reagents to treat tetravalent vanadium ions and doped ion aqueous solution to obtain a precursor treatment process of suspension. In the precursor treatment step, an alkaline reagent can be used to titrate the tetravalent vanadium ion and the doped ion aqueous solution until a suspension is formed. The pH of the end point of the titration can be 2-12, preferably 5-10, and more preferably 6-8.

[0027] In the present invention, the tetravalent vanadium ion aqueous solution can be prepared by dissolving soluble vanadium raw materials in water. Commonly used soluble vanadium raw materials can be trivalent, tetravalent or pentavalent vanadium salts and / or their hydrates, preferably tetravalent soluble vanadium salts and their hydrates, such as vanadium oxysulfate (VOSO 4 ), vanadium oxychloride (VOCl 2 ) And vanadyl oxalate anhydrate (VOC 2 O 4 ·5H 2 O). It should be under...

Example Embodiment

[0046] Example 1

[0047] 10g VOSO 4 Dissolve in 50ml deionized water, titrate with 1mol / L NaOH solution, and keep stirring. After the titration is complete, put the suspension into a 50ml hydrothermal kettle containing 45ml deionized water, and react hydrothermally at 240℃ for 96 hours , Centrifugal drying to obtain vanadium dioxide powder. The XRD spectrum shows that the crystal phase is pure M phase. The DSC curve shows that vanadium dioxide powder has phase transition properties, and the phase transition temperature is 67°C. The ultraviolet-visible absorption spectrum shows that its optical band gap is 1.53 eV and the intrinsic band gap is 0.7 eV.

[0048] Grind 1g of the above-prepared VO2 powder and put it into a small beaker containing 20ml of water with constant stirring, add 0.5g of polyvinylpyrrolidone K-30, stir for 30 minutes and then ultrasonic for 60 minutes to prepare a dispersion. The obtained dispersion is coated on a glass substrate by a spin coating method, an...

Example Embodiment

[0049] Example 2

[0050] 5g VOCl 2 And 0.005g MgCl 2 Dissolve in 50ml deionized water, use 0.5mol / L NH 3 ·H 2 The O solution is titrated with constant stirring. After the titration is completed, the suspension is put into a 50ml hydrothermal kettle containing 45ml of deionized water, reacted hydrothermally at 290°C for 18 hours, centrifuged and dried to obtain magnesium-doped vanadium dioxide powder , Its chemical formula is Mg 0.007 V 0.993 O 2 . The phase of magnesium doped vanadium dioxide powder is M phase, and the phase transition temperature is 64°C. The optical band gap of 0.7% magnesium doped vanadium dioxide powder is 1.60 eV, and the intrinsic band gap is 0.72 eV.

[0051] 1g Mg 0.007 V 0.993 O 2 The powder repeats the experiment in Example 1 to prepare a magnesium-doped vanadium dioxide film. Calculating with spectral data, it is found that the integrated visible light transmittance before and after the phase change of the film is 52.4% and 49.7%, and the solar contro...

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Abstract

The invention relates to a method for adjusting a band gap of a vanadium dioxide film. The method realizes vanadium dioxide film band gap adjustment by adjustment of a band gap of vanadium dioxide for preparation of a vanadium dioxide film. The method comprises the following steps of preparation of vanadium dioxide powder having adjustable band gap: adding a specified amount of an adopted element in a vanadium dioxide powder hydrothermal method preparation so that the obtained vanadium dioxide powder having a chemical composition of V1-xMxO2 has an optical band gap continuously adjustable in a range of 0.6-4.0eV, wherein x is greater than 0 and is less than or equal to 0.5 and the adopted element M represents magnesium, aluminum, lanthanum, zirconium, gallium, niobium, tin, tantalum, manganese, nickel, chromium, zinc, titanium, tungsten, antimony, bismuth, indium or iron, and preparation of a vanadium dioxide film of which band gap is adjustable: coating a substrate with the band gap-adjustable vanadium dioxide powder dispersion liquid to obtain the band gap-adjustable vanadium dioxide film having an optical band gap continuously adjustable in a range of 0-4.0eV.

Description

Technical field [0001] The invention relates to the preparation of vanadium dioxide films in the chemical industry and materials fields, and particularly relates to a method for adjusting the band gap of the vanadium dioxide film by doping. Background technique [0002] According to statistics, my country's building energy consumption has reached 30% of the total social energy consumption. As my country's economy continues to develop, building energy conservation has become the focus of attention of all sectors of society. In building energy consumption, the energy consumption generated by glass accounts for about 50% of building energy consumption. How to reduce the energy consumption of windows is of great significance to energy saving and emission reduction. [0003] At present, measures such as Low-E glass, gas-chromic windows and electrochromic windows are mainly used to reduce the energy consumption of windows. However, these energy-saving windows have disadvantages such as h...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C03C17/23C03C2217/218C03C2217/74
Inventor 高彦峰陈石曹传祥罗宏杰戴雷金平实
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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