Preparation method of tungsten-lanthanum co-doped vanadium dioxide powder

A vanadium dioxide and co-doping technology, applied in vanadium oxide and other directions, can solve the problem of less research on multi-element co-doping, and achieve the effect of reducing the phase transition temperature

Pending Publication Date: 2022-02-01
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through domestic and foreign scientists to VO 2 The study found that ion doping can effectively regulate VO 2 The phase transition temperature, such as doping tungsten, molybdenum, fluorine, niobium, lanthanum and other elements can reduce VO 2 Phase transition temperature, but currently there are more studies on single element doping, but less research on multi-element co-doping

Method used

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preparation example Construction

[0013] The preparation method of vanadium dioxide powder co-doped with tungsten and lanthanum comprises the following steps: a. Prepare a tetravalent vanadium salt solution with a concentration of 0.1-1.5 mol / L, and weigh it according to the molar ratio of vanadium salt and precipitant as 1:5-30 Take the precipitant, and then dope tungsten and lanthanum elements, wherein: the dopant is weighed according to the atomic percentage range of tungsten element is 1-10at%, and the atomic percentage range of lanthanum element is 1-10at%, and then mixed and stirred Fully dissolve to obtain a mixed liquid; b. Measure the mixed liquid and add it to a microwave digestion tank, set the microwave temperature to 100-200 °C and the time to 1-3 hours; c. After the reaction is completed, use alcohol and pure Washing with water alternately, and drying in vacuum to obtain tungsten-lanthanum co-doped vanadium dioxide powder.

[0014] The present invention adopts the method of co-doping two rare met...

Embodiment 1

[0018] Preparation of tungsten-lanthanum co-doped vanadium dioxide nanopowder. Prepare a vanadyl oxalate solution with a concentration of 0.5M, use sodium hydroxide as a precipitant, and add sodium hydroxide to the vanadyl sulfate solution at a molar ratio of 1:5, and then add them at 3at% and 1at% respectively Sodium tungstate and lanthanum chloride to obtain a mixed solution. Take a certain amount of mixed solution and add it to the microwave digestion tank. The volume should not exceed two-thirds of the volume of the digestion tank. Set the microwave heating temperature to 100°C, and the reaction time is 1h. After the reaction is completed, cool to room temperature and filter to obtain a black precipitate. , washed alternately with ethanol and deionized water for 3 times, and dried in vacuum at 60 °C for 3 h, the doped VO 2 Powder. The phase transition temperature is 59°C.

Embodiment 2

[0020] Preparation of tungsten-lanthanum co-doped vanadium dioxide nanopowder. Prepare a vanadyl sulfate solution with a concentration of 0.5M, use sodium carbonate as a precipitant, add sodium carbonate to the vanadyl sulfate solution at a molar ratio of 1:5, and then add tungstic acid at 5at% and 3at% respectively sodium and lanthanum chloride to obtain a mixed solution. Take a certain amount of mixed solution and add it to the microwave digestion tank. The volume should not exceed two-thirds of the volume of the digestion tank. Set the microwave heating temperature to 100°C, and the reaction time is 1h. After the reaction is completed, cool to room temperature and filter to obtain a black precipitate. , washed alternately with ethanol and deionized water for 3 times, and dried in vacuum at 60 °C for 3 h, the doped VO 2 Powder. The phase transition temperature is 45°C.

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Abstract

The invention relates to the field of preparation methods of vanadium dioxide powder, in particular to a preparation method of tungsten-lanthanum co-doped vanadium dioxide powder with obviously reduced phase change temperature and uniform particle size, the method comprises the following steps: a, preparing a tetravalent vanadium salt solution with the concentration of 0.1-1.5 mol / L, weighing a precipitant according to the molar ratio of vanadium salt to the precipitant of 1: (5-30), then doping tungsten element and lanthanum element, wherein the doping agent is weighed according to the atomic percent range of tungsten element being 1-10 at% and the atomic percent range of lanthanum element being 1-10 at%, and then mixing and stirring are performed for sufficient dissolution to obtain a mixed solution; b, measuring the mixed liquid, adding the mixed liquid into a microwave digestion tank, and setting the microwave temperature to be 100-200 DEG C and the time to be 1-3 hours; c, after the reaction is finished, alternately washing generated precipitates with alcohol and pure water, and after vacuum drying, obtaining tungsten-lanthanum co-doped vanadium dioxide powder. The method is particularly suitable for preparing the vanadium dioxide powder.

Description

technical field [0001] The invention relates to the field of preparation methods of vanadium dioxide powder, in particular to a preparation method of vanadium dioxide powder co-doped with tungsten and lanthanum. Background technique [0002] According to statistics, my country's building energy consumption accounts for about 30% of the total energy consumption of the society, and reducing building energy consumption is of great significance for realizing energy conservation and emission reduction. With today's society's requirements for architectural beauty and lighting, glass doors and windows account for a large proportion of building structures. Glass doors and windows are the main channels for heat exchange between buildings and the outside world. Therefore, research on energy-saving technology for door and window glass is the key to reducing building energy consumption. For this reason, scientists have proposed the concept of thermochromic smart windows, which can sens...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02
Inventor 文俊维刘波杨亚东姚洁
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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