Composite mixed vanadium dioxide nano powder material and its preparation process

A technology of vanadium dioxide nanometer and powder materials, which is applied in the direction of vanadium oxide, etc., can solve the problems of adverse effects on the environment and the health of operators, complex process steps, and high power of the heating furnace, etc., and is beneficial to environmental protection and operators. health, less equipment investment, and small power requirements

Inactive Publication Date: 2005-11-09
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

The problem that said technical scheme exists is: 1, contain ammonium in the raw material, therefore must control the content of ammonium to guarantee to obtain accurate VO 2 structure, which brings difficulties to process control; 2. The temperature rise rate of the precursor pyrolysis is at least 100°C / min, so the power of the heating furnace is relatively large, which increases the cost of the equipment; 3. The particle size of the prepared vanadium dioxide particles is Micron-scale (size less than 5 microns), doped vanadium dioxide particles are only doped with one kind of metal ion, so the application is limited
The doped vanadium dioxide nanopowder material provided by the above-mentioned technical scheme only contains one kind of metal ion, and the process steps are relatively complicated. Because the raw material uses hydrochloric acid and ammonia-containing substances, it will have adverse effects on the environment and the health of the operator.

Method used

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  • Composite mixed vanadium dioxide nano powder material and its preparation process

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Embodiment 1

[0039] Example 1: Preparation of Mo-F composite doped vanadium dioxide nanopowder material

[0040] The first group: choose industrial grade V 2 o 5 , V 2 o 5 with MoO 3 , NH 4 The formula of F is calculated by weight percentage: V 2 o 5 98%, MoO 3 1%, NH 4 F 1%; V 2 o 5 The weight ratio with oxalic acid is 1:1.

[0041] (1) Preparation of precursor

[0042] First the ratio of V 2 o 5 with MoO 3 After mixing evenly, put it into a container, heat it to 800°C under normal pressure to become a molten state, then pour the melt into a reaction container filled with water and stir (the amount of water added is not strictly required to disperse V 2 o 5 with MoO 3 melt), and then add the ratio of oxalic acid and NH 4 F and continue to stir until the reduction reaction is completed to obtain a blue liquid without precipitation (the whole process is about 3 hours), after the reduction reaction is completed, the obtained solution is evaporated to dryness at 90 ° C to o...

Embodiment 2

[0066] Embodiment 2: Preparation of W-F composite doped vanadium dioxide nanopowder material

[0067] The first group: choose industrial grade V 2 o 5 , V 2 o 5 with N 5 h 37 W 6 o 24 , NH 4 The formula of F is calculated by weight percentage: V 2 o 5 97%, N 5 h 37 W 6 o 24 1%, NH 4 F 2%; V 2 o 5 The weight ratio with oxalic acid is 1:1

[0068] (1) Preparation of precursor

[0069] First the ratio of V 2 o 5 , N 5 h 37 W 6 o 24 , NH 4 F, oxalic acid and V 2 o 5 Put polyethylene glycol and oxalic acid gross weight 2% into reaction container and add water and stir at normal pressure, 40 ℃ (the adding amount of water is not strictly required, it is advisable to be flooded with the raw material in the reaction container), until reduction reaction Until a blue liquid without precipitation is obtained (the whole process is about 3 hours), after the reduction reaction is completed, the obtained solution is evaporated to dryness at 90° C. to obtain a soli...

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Abstract

A process for preparing the doped composite VO2 nanoparticles with low phase-change temp (25-30 deg.C) and improved physical propoerties includes such steps as preparing the metal element and non-metal element doped solid vanadium oxalate as precursor from V2O5 and oxalic acid, and vacuum thermodecomposing. Its molecular formula is V1-xMxO2-yZy, where x=0-0.08, y=0-0.1, M is metal element and Z is non-metal element.

Description

technical field [0001] The invention belongs to a vanadium dioxide nanometer powder material and a preparation method thereof, in particular to a composite doped vanadium dioxide nanometer powder material and a preparation method thereof. Background technique [0002] VO 2 It is a typical phase-change compound, which undergoes a first-order phase transition at around 68°C. Along with the phase transition, the resistivity, magnetic susceptibility, optical refractive index, transmittance, and reflectance undergo a sudden change, and the phase transition process is reversible. Experiments have shown that doping can change VO 2 The phase transition temperature, expanding VO 2 field of application, therefore, for doped VO 2 The research on its preparation method has very important value. [0003] The Chinese patent application with the application number 95196132.2 discloses a vanadium dioxide particle and its preparation method. The vanadium di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 黄维刚林华范樵乔涂铭旌
Owner SICHUAN UNIV
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