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Preparation method of doped vanadium dioxide micro-tube array, vanadium dioxide micro-tube array and vanadium dioxide micro-tube

A technology of vanadium dioxide and micron tubes, applied in chemical instruments and methods, diffusion/doping, secondary batteries, etc., can solve the problems of vanadium dioxide phase transition performance degradation, difficult industrial production, complex process, etc., and achieve improvement Cycle stability, beneficial to industrial production, and simple process

Active Publication Date: 2020-08-11
赵春旺
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a certain gap between this temperature and room temperature, so how to further reduce the phase transition temperature and maintain good phase transition performance is a current research hotspot.
Doping vanadium dioxide is an effective means to reduce the phase transition temperature, but there are two major deficiencies in view of the current research status: one is that the current preparation of doped vanadium dioxide is complicated, takes a long time, The cost is high, and it is difficult to implement industrial production; the second is that although there are reports in the literature that the phase transition temperature of doped vanadium dioxide has been reduced to 28°C, the phase transition performance of vanadium dioxide is degraded, which is not conducive to application

Method used

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  • Preparation method of doped vanadium dioxide micro-tube array, vanadium dioxide micro-tube array and vanadium dioxide micro-tube
  • Preparation method of doped vanadium dioxide micro-tube array, vanadium dioxide micro-tube array and vanadium dioxide micro-tube
  • Preparation method of doped vanadium dioxide micro-tube array, vanadium dioxide micro-tube array and vanadium dioxide micro-tube

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Step 1: Weigh 9.314 grams of small metal vanadium particles and 0.686 grams of small metal tungsten particles. The atomic ratio of the two metals is 98:2; the purity of small metal vanadium particles and small metal tungsten particles are both 99.95%. Material (Beijing) Technology Co., Ltd.

[0040] Step 2: Smelting small particles of metal vanadium and metal tungsten with a good ratio in a vacuum electric arc furnace to make a tungsten-doped vanadium block; the block obtained by melting is approximately ellipsoidal, with a thickness of about 7mm.

[0041] Step 3: Cut the tungsten-doped vanadium block into tungsten-doped vanadium sheets with a length of 20 mm, a width of 3 mm, and a thickness of 0.2 mm; the tungsten-doped vanadium sheets can be obtained by cutting with professional equipment.

[0042] Step 4: In the air at room temperature, heat the tungsten-doped vanadium sheet with 5-50 amps of direct current or alternating current, so that the tungsten-doped vanadium...

Embodiment 2

[0052] Step 1: Weigh 9.641 grams of small metal vanadium particles and 0.359 grams of small metal niobium particles, and the atomic ratio of the two metals is 98:2;

[0053] Step 2: smelting small particles of metal vanadium and metal niobium with a good ratio in a vacuum electric arc furnace to make a niobium-doped vanadium block;

[0054] Step 3: cutting the niobium-doped vanadium block into niobium-doped vanadium sheets with a width of 20 mm, a width of 3 mm, and a thickness of 0.2 mm;

[0055] Step 4: In the air at room temperature, heat the niobium-doped vanadium sheet with 5-50 amps of direct current or alternating current. When the temperature reaches 1100-1900 degrees Celsius, keep it for 10-20 seconds;

[0056] Step 5: cut off the power supply, let the niobium-doped vanadium sheet cool down to room temperature naturally, and obtain a solid synthesis product with an overall diameter of about 3 mm in the central region of the niobium-doped vanadium sheet.

[0057] The ...

Embodiment 3

[0061] Step 1: Weigh 9.769 grams of small metal vanadium particles and 0.231 grams of small metal cobalt particles, and the atomic ratio of the two metals is 98:2;

[0062] Step 2: Smelting small particles of metal vanadium and metal cobalt with a good ratio in a vacuum electric arc furnace to make a cobalt-doped vanadium block;

[0063] Step 3: Cut the cobalt-doped vanadium block into cobalt-doped vanadium sheets with a width of 20 mm, a width of 3 mm, and a thickness of 0.2 mm;

[0064] Step 4: In the air at room temperature, heat the cobalt-doped vanadium sheet with 40 amps of direct current or alternating current. When the temperature reaches 1700 degrees Celsius, keep it for 10 to 20 seconds;

[0065] Step 5: cut off the power supply, let the cobalt-doped vanadium flakes cool naturally to room temperature, and obtain a solid synthetic product with an overall diameter of about 3 mm in the central region of the cobalt-doped vanadium flakes.

[0066] The morphology of the s...

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Abstract

The invention discloses a preparation method of a doped vanadium dioxide micro-tube array, the vanadium dioxide micro-tube array and a vanadium dioxide micro-tube. The method comprises the following steps: 1, respectively weighing a metal vanadium raw material and a doping material used for being doped into metal vanadium according to a preset doping proportion; 2, smelting the metal vanadium rawmaterial and the doping material to form a uniformly mixed block; 3, cutting the block into a sheet so as to obtain a doped vanadium sheet; 4, heating the vanadium sheet to 1100-1900 DEG C through a current heating method, and keeping the vanadium sheet at the temperature for 10-20 s; and 5, naturally cooling the vanadium sheet to a room temperature so as to obtain the vanadium dioxide micro-tubearray, composed of doped vanadium dioxide micro-tubes, on the surface of the vanadium sheet, wherein the vanadium dioxide micro-tubes are vertically arranged on the surface of the vanadium sheet in anarray mode and are of hollow structures, and the cross sections of the vanadium dioxide micro-tubes are approximately rectangular. The doping method is simple and easy to implement, low in cost, lowin equipment requirement, short in period and beneficial for industrial implementation.

Description

technical field [0001] The invention relates to the technical field of vanadium dioxide functional materials, in particular to a method for preparing a doped vanadium dioxide microtube array, the vanadium dioxide microtube array and the vanadium dioxide microtube. Background technique [0002] Vanadium dioxide (VO 2 ) is a functional material with thermally induced phase change characteristics. Its phase transition temperature is about 68°C, and a reversible phase transition between a high-temperature metal phase (R phase) and a low-temperature insulator phase (M1 phase) occurs at this temperature. The phase transition temperature of vanadium dioxide is closer to room temperature than that of other vanadium oxides, so it has become the mainstream research object in recent years. However, there is still a certain gap between this temperature and room temperature, so how to further reduce the phase transition temperature and maintain good phase transition performance is a cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B35/00C30B29/66C30B29/16C30B31/00H01M4/485H01M10/0525H01M10/054
CPCC30B29/16C30B29/66C30B31/00C30B35/00H01M4/485H01M10/0525H01M10/054Y02E60/10
Inventor 赵春旺李子剑
Owner 赵春旺
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