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Preparation method of vanadium dioxide powder

A technology of vanadium dioxide and powder, which is applied in the field of vanadium dioxide powder preparation by hydrothermal method, can solve the problems of slow research progress, difficulty in preparation, and does not cause scientific research workers, and achieves good crystallinity of the product, easy operation, easily controlled effects

Inactive Publication Date: 2011-07-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the difficulty in synthesis and the lack of people's understanding, VO 2 The research progress of (A) has been very slow but due to the difficulty of preparation, the VO of phase A 2 has not attracted enough attention from the majority of scientific researchers.

Method used

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  • Preparation method of vanadium dioxide powder
  • Preparation method of vanadium dioxide powder
  • Preparation method of vanadium dioxide powder

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preparation example Construction

[0030] The preparation of the vanadium dioxide powder of the present invention can use a tetravalent vanadium ion aqueous solution as a reaction precursor, and treat the reaction precursor with an alkaline reagent.

[0031] The configuration of the tetravalent vanadium ion aqueous solution can be prepared by a method commonly used in this field: dissolve the tetravalent soluble vanadium raw material in an appropriate amount of water, preferably deionized water, and the suitable concentration can be 0.005-0.5mol / L, usually 0.01 mol / L L. Quaternary soluble vanadium salts can be commonly used cheap vanadium salts, such as vanadyl sulfate (VOSO 4 ) and vanadium oxychloride (VOCl 2 ). Of course, hydrates of vanadium salts, such as vanadyl oxalate anhydrate (VOC 2 o 4 .5H 2 o). The preparation of the tetravalent vanadium ion solution is usually carried out at normal temperature, but it is also understandable that a little heating or ultrasonication can be used to assist the di...

Embodiment 1

[0044] 1g VOSO 4 Dissolve the powder in 50ml deionized water, titrate with 1 mol / L NaOH solution, and keep stirring. After the titration is complete, put the suspension into a 50ml hydrothermal kettle filled with 45ml deionized water, and heat it at 250℃. Reaction for 12 hours, centrifugal drying to obtain vanadium dioxide powder, its chemical formula is VO 2 , the yield is 90%. like figure 1 Its crystal phase is A phase shown in the XRD spectrum, as figure 2 As shown in the TEM photo, the obtained vanadium dioxide powder is in the shape of a long rod, and each long rod of vanadium dioxide is a single crystal, with a length of hundreds of nm to tens of μm and a width of several hundreds of nm.

Embodiment 2

[0046] 1g VOSO 4 Dissolve the powder in 50ml deionized water, titrate with 1 mol / L NaOH solution, and keep stirring, and mix the suspension with 25mg Bi 2 o 3 Put them together into a 50ml hydrothermal kettle filled with 45ml deionized water, conduct a hydrothermal reaction at 250°C for 12 hours, and centrifuge and dry to obtain vanadium dioxide powder. After elemental analysis, its chemical formula is V 0.983 Bi 0.017 o 2 , the yield is 90%. like image 3 Its crystal phase is M phase as shown in the XRD spectrum, as Figure 4 As shown in the TEM photo, the prepared vanadium dioxide powder is granular, and each vanadium dioxide particle is a single crystal particle, and its grain size is mainly concentrated between 40-70nm, and the aspect ratio is less than 2:1.

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Abstract

The invention relates to a preparation method of vanadium dioxide powder, comprising a precursor treatment procedure of treating a tetravalent vanadium ion water solution with an alkali reagent to obtain suspension. The preparation method provided by the invention has the advantages of simplicity and convenience for operation, low cost, high yield and suitability to scale production, and the vanadium dioxide powder prepared with the preparation method provided by the invention has uniform particle size and good dispersibility.

Description

technical field [0001] The invention relates to the preparation of vanadium dioxide powder in the fields of chemical industry and materials, in particular to the preparation of vanadium dioxide powder by a hydrothermal method. Background technique [0002] Vanadium oxide is a complex system of multivalent states and polycrystalline phases. Among them, there are more than 10 kinds of crystal structures of vanadium dioxide, mainly including A phase, B phase, C phase, M phase, R phase and hydrate etc. 10 other crystalline phases. [0003] At present, the M / R phase vanadium dioxide with thermochromic properties is the most researched, because it can be widely used in smart window coatings, photoelectric switches, thermistors and optical information storage and other fields: in the context of global energy supply tightening and Under the situation of deteriorating environment, energy conservation and emission reduction has become the common goal of all countries in the world. A...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y40/00
Inventor 高彦峰曹传祥戴雷罗宏杰金平实
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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