Preparation method of Mx' phase VO2 nanometer material with metallic characters under normal pressure

A technology of metal properties and nanomaterials, applied in vanadium oxide and other directions, to achieve the effects of good stability, simple experimental method and broad application prospects

Inactive Publication Date: 2017-07-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, domestic and foreign have not seen the relevant VO 2 (Mx') research report on W doping

Method used

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  • Preparation method of Mx' phase VO2 nanometer material with metallic characters under normal pressure
  • Preparation method of Mx' phase VO2 nanometer material with metallic characters under normal pressure
  • Preparation method of Mx' phase VO2 nanometer material with metallic characters under normal pressure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] VO 2 (R) The preparation process of nanoparticles is as follows: 0.2275g V 2 o 5 , 0.3938g oxalic acid, 0.0825gNa 2 WO 4 2H 2 O was added to a beaker containing 100ml of deionized water, so that the molar ratio of W and V in the reactant was 10:100, and the resulting reactant solution was stirred until transparent with a magnetic stirrer, then transferred to a 50ml reaction kettle, filled with The ratio was 0.6, and it was incubated at 190°C for 24 hours. After the reaction was finished, it was naturally cooled to room temperature, and the product was taken out, washed several times with alcohol and deionized water, and then placed in a freeze dryer for low-temperature vacuum drying for 24 hours. Finally, the dried product was taken out and calcined at 600° C. for 3 hours under the protection of argon. The tungsten-doped VO prepared in this embodiment 2 (R) Electron micrographs of nanoparticle raw materials are shown in figure 1 , the x-ray diffraction pattern i...

Embodiment 2

[0023] The rhenium sheet was pre-pressed with a diamond counter-anvil press with an anvil surface of 200 μm, and a hole with a diameter of 100 μm was drilled in the center of the indentation, which was used as a sample cavity for loading raw materials. The tungsten-doped R phase VO that the appropriate amount of embodiment 1 makes 2 Fill the nanoparticle raw materials into the sample chamber, add ruby ​​microspheres as pressure marks (to detect the pressure in the pressure chamber), drop a mixed solution of formazan / ethanol with a volume ratio of 4:1 as the pressure transmission medium, and then seal the pressure chamber. machine for pressurization. When the pressure rises to ~64GPa, and the pressure is released to normal pressure, the Mx' phase VO with metallic characteristics can be obtained 2 nanoparticles. The prepared Mx' phase VO with metallic properties 2 Electron micrographs, X-ray diffraction spectra and infrared spectra of nanoparticles are shown in image 3 , ...

Embodiment 3

[0025] The press, sample chamber and pressure transmission medium are the same as those in Embodiment 2. The tungsten-doped R phase VO that embodiment 1 makes 2 The nanoparticle raw material fills the sample cavity, and then adds ruby ​​microspheres as a pressure mark (to detect the pressure in the pressure cavity), and then seals the press for pressurization. When the pressure rises to ~65.5GPa, and the pressure is released to normal pressure, the Mx' phase VO with metallic characteristics can be obtained 2 Nanoparticles, fabricated Mx' phase VO with metallic properties 2 Infrared spectra of nanoparticles see Image 6 .

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Abstract

The invention relates to a preparation method of an Mx' phase VO2 nanometer material with metallic characters under normal pressure, and belongs to the technical field of preparation of nanometer materials. The preparation method comprises the following steps: preparing tungsten doped vanadium dioxide nanoparticles by taking vanadium pentoxide, oxalic acid and sodium tungstate as starting materials through hydrothermal treatment and calcination; and performing treatment under pressure up to 64 GPa and relieving pressure to obtain the Mx' phase VO2 nanometer material capable of existing stably under the conditions of normal temperature and normal pressure and with metallic characters. The preparation method provided by the invention is simple and easy to operate; the prepared samples are uniformly in shape and high in crystallinity; and compared with VO2 with other structures, the tungsten doped VO2 (Mx') phase can maintain the structure of the sample to be unchanged after being converted into metal, so high stability is achieved in the insulator-metal transformation process, and a certain application prospect is achieved.

Description

technical field [0001] The invention belongs to the preparation of VO 2 The technical field of nanomaterials, specifically related to the use of tungsten-doped VO 2 (R) Nanoparticles prepare VO with metallic properties by high-pressure method 2 New approaches to nanomaterials. Background technique [0002] VO 2 It is an important functional material with unique electrical, optical and magnetic properties, and has important application prospects in the fields of smart glass, electrical switches, gas-sensitive resistors, and lithium battery data storage. In nature, VO with semiconducting properties 2 There are many types of crystals, including: VO 2 (M1), VO 2 (A), VO 2 (B), VO 2 (C) and VO 2 (D), however, VO with metallic properties 2 Crystal only VO 2 (R). In recent years, with the continuous development of material preparation technology, more new VO 2 Structures such as M2, M3 and T phases obtained by doping, however these are semiconductor phases. So far, wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
CPCC01G31/02C01P2002/72C01P2002/82C01P2004/04C01P2004/80
Inventor 李全军张华芳关洲申鹏飞董青刘冰冰
Owner JILIN UNIV
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