A kind of preparation method of vanadium dioxide nanopowder

A vanadium dioxide nanometer and powder technology, applied in vanadium oxide, nanotechnology and other directions, can solve the problems of high energy consumption of hydrothermal reaction, unfavorable large-scale production, difficulty in continuous production, etc., and achieves low production cost and easy large-scale production. The effect of producing and avoiding adverse effects

Active Publication Date: 2022-06-21
广东清大创新研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high energy consumption of hydrothermal reaction, high requirements on equipment, complex preparation process, continuous production is difficult, while solvothermal reaction needs to consume a large amount of organic solvents, causing large pollution and high cost, which is not conducive to large-scale production

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  • A kind of preparation method of vanadium dioxide nanopowder
  • A kind of preparation method of vanadium dioxide nanopowder
  • A kind of preparation method of vanadium dioxide nanopowder

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preparation example Construction

[0035] The preparation method of a kind of vanadium dioxide nano-powder provided by this embodiment, it comprises the following steps:

[0036] Step 1, adding a certain amount of tetravalent vanadium salt to deionized water, and stirring until completely dissolved to obtain solution a;

[0037] Step 2, adding a certain amount of precipitant to the solution a, adjusting the pH to 8-12, and stirring for a period of time to obtain a suspension b;

[0038] Step 3, separating the suspension b to obtain the precipitate c, dispersing the precipitate c in deionized water, adding a certain amount of hydrogen peroxide, adjusting the pH to 3-6, and aging at room temperature for 1-6 hours to obtain the suspension d;

[0039] Step 4, separating the suspension d to obtain the precipitate e, drying the precipitate e for a period of time, calcining at 450-700° C. for 1-5 hours under the protection of an inert gas, and cooling to room temperature to obtain the vanadium dioxide nano-powder.

...

Embodiment 1

[0047] Embodiment 1: a kind of preparation method of vanadium dioxide nano powder comprises the following steps:

[0048] Step 1, dissolve 3 g of vanadyl oxalate in deionized water, stir with an electromagnetic stirrer until it is completely dissolved, and prepare 100 mL of solution a with a concentration of 0.12 mol / L;

[0049] Step 2, slowly add ammonia water with a mass percentage concentration of 20% to solution a, until the pH of solution a=9, and continue to stir for 0.5 hours to obtain suspension b;

[0050] Step 3, the suspension b is filtered and separated to obtain a precipitate c, the precipitate c is dispersed in 100 mL of deionized water, and the hydrogen peroxide whose mass percentage concentration is 10% is slowly added dropwise while stirring, wherein, the molar ratio of vanadyl oxalate: ammonia water: hydrogen peroxide The ratio is 1:2:0.2, the pH is adjusted to 4, and it is aged for 2 hours at room temperature to obtain suspension d;

[0051] In step 4, the ...

Embodiment 2

[0053] Embodiment 2: a kind of preparation method of vanadium dioxide nano powder comprises the following steps:

[0054] Step 1, dissolve 1.6 g of vanadyl sulfate in deionized water, stir with an electromagnetic stirrer until it is completely dissolved, and prepare 100 mL of solution a with a concentration of 0.10 mol / L;

[0055] Step 2, slowly add 10% ammonium bicarbonate solution dropwise to solution a until the pH of solution a=10, and continue stirring for 1 hour to obtain suspension b;

[0056] Step 3, the suspension b was filtered and separated to obtain the precipitate c, the precipitate c was dispersed in 100 mL of deionized water, and the hydrogen peroxide with a mass percentage concentration of 8% was slowly added dropwise while stirring, wherein, vanadyl sulfate: ammonium bicarbonate: hydrogen peroxide The molar ratio is 1.3:2.8:0.4, the pH is adjusted to 5, and it is aged at room temperature for 4 hours to obtain suspension d;

[0057] In step 4, the suspension d...

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Abstract

The invention discloses a preparation method of vanadium dioxide nanopowder, which comprises: 1) adding tetravalent vanadium salt into deionized water, stirring until completely dissolved to obtain solution a; 2) adding a precipitating agent into solution a, Adjust the pH to 8-12, stir for a period of time to obtain a suspension b; 3) separate the suspension b to obtain a precipitate c, disperse the precipitate c in deionized water, add hydrogen peroxide, adjust the pH to 3-6, and age at room temperature 1 to 6 hours to obtain the suspension d; 4) separate the suspension d to obtain the precipitate e, dry the precipitate e for a period of time, calcinate at 450-700°C for 1-5 hours under the protection of an inert gas, and cool to room temperature Afterwards, vanadium dioxide nanopowder is obtained. The invention has reasonable and ingenious design, simple preparation process, readily available raw materials, low reaction energy consumption, less environmental pollution, short production cycle, no need for expensive production equipment, low production cost, and easy large-scale production.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a preparation method of vanadium dioxide nano-powder. Background technique [0002] Vanadium dioxide (VO 2 ) has a variety of crystalline phases, such as A phase, B phase, M phase and R are equal, of which the R phase is the most stable. At a temperature of 68 °C, vanadium dioxide will transform from monoclinic phase to rutile phase, and a reversible semiconductor-metal phase transition occurs. At the same time of phase transition, the physical properties of vanadium dioxide such as optical transmittance and resistivity also mutation will occur. When the temperature is lower than the phase transition temperature of 68℃, vanadium dioxide has high transmittance in both the visible and infrared bands; when the temperature is higher than the phase transition temperature of 68℃, the absorption and reflection of vanadium dioxide on light waves are enhanced, and the transmission T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y40/00
CPCC01G31/02B82Y40/00C01P2004/32C01P2004/64C01P2004/62
Inventor 蒋永东陈三名陈沛杭
Owner 广东清大创新研究院有限公司
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