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Method for preparing doped vanadium dioxide nano-powder by ultrasonic spraying

A vanadium dioxide nanometer, ultrasonic spray technology, applied in vanadium oxide, nanotechnology, chemical industry and other directions, can solve the problems of reducing phase transition temperature, insufficient research on doping process, etc., and achieve uniform shape and powder particle size. Narrow distribution of effects

Pending Publication Date: 2022-02-01
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
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AI Technical Summary

Problems solved by technology

Through domestic and foreign research, it has been 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, current, for different element doping VO 2 There are many studies, but the research on its doping process is not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Configure 1000ml of 0.3mol / L ethylene glycol vanadyl solution, add sodium tungstate according to the atomic percentage of 3at%, and ultrasonically disperse for 1 hour to obtain a precursor solution; place the precursor solution in an ultrasonic nebulizer with an ultrasonic frequency of 3MHz and atomize it. Droplets, the carrier gas argon is introduced, the small droplets are passed through a tube furnace with a heating temperature of 600°C, and the end of the tube furnace is collected by a high-voltage electrostatic collector, reacted for 2 hours, and the collected powder is filtered After washing and vacuum drying at 60°C, a blue-black M-phase vanadium dioxide nanopowder is obtained, with a phase transition temperature of 54°C.

Embodiment 2

[0017] Configure 1000ml of 0.3mol / L vanadyl oxalate solution, add molybdenum oxide according to the atomic percentage of 5at%, and ultrasonically disperse for 1 hour to obtain a precursor solution; place the precursor solution in an ultrasonic nebulizer with an ultrasonic frequency of 3MHz to atomize to generate mist droplets, Pass the carrier gas argon, pass the small droplets through a tube furnace with a heating temperature of 550°C, collect them with a high-voltage electrostatic collector at the end of the tube furnace, react for 3 hours, and filter and wash the collected powder for 60 After vacuum drying at ℃, the blue-black M-phase vanadium dioxide nanopowder is obtained, and the phase transition temperature is 56℃.

Embodiment 3

[0019] Configure 1000ml of 0.3mol / L vanadyl acetylacetonate solution, add sodium paratungstate according to the atomic percentage of 6at%, and ultrasonically disperse for 1 hour to obtain a precursor solution; place the precursor solution in an ultrasonic nebulizer with an ultrasonic frequency of 3MHz and atomize it to produce Droplets, the carrier gas argon is introduced, the small droplets are passed through a tube furnace with a heating temperature of 600°C, and the end of the tube furnace is collected by a high-voltage electrostatic collector, reacted for 2 hours, and the collected powder is filtered After washing and vacuum drying at 60°C, a blue-black M-phase vanadium dioxide nanopowder is obtained, with a phase transition temperature of 40°C.

[0020] It can be concluded from the above examples that the process of the present application is easy to operate, highly efficient in reaction, and can effectively control the phase transition temperature.

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Abstract

The invention relates to the field of vanadium dioxide nano powder preparation methods, in particular to a method for preparing doped vanadium dioxide nano-powder by ultrasonic spraying, which is simple and convenient in technological operation, efficient in reaction and capable of preventing powder agglomeration, the method comprises the following steps: a, preparing a mixed solution of a vanadium source and a dopant, wherein the concentration of the vanadium salt solution is 0.1-2 mol / L, the doping agent is prepared according to the atomic percent of a doping element of 1-15 at%, and the doping element is one or two of tungsten, molybdenum, niobium, lanthanum, bismuth, fluorine or manganese; b, preparing a mixed solution of the vanadium source and the dopant: mixing the vanadium salt solution and the dopant to form the mixed solution, then carrying out ultrasonic spraying to form fog drops, carrying the fog drops into the tubular furnace by carrier gas, and setting the temperature to be 500-800 DEG C and the reaction time to be 1-6 hours; and c, collecting a reaction product, filtering, washing and drying to obtain the VO2-doped powder. The method is especially suitable for the field of intelligent temperature control film energy-saving materials.

Description

technical field [0001] The invention relates to the field of preparation methods of vanadium dioxide nanometer powder, in particular to a method for preparing doped vanadium dioxide nanometer powder by ultrasonic spraying. Background technique [0002] 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 sense the temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y40/00
CPCC01G31/02B82Y40/00Y02P20/10
Inventor 文俊维彭穗刘波辛亚男
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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