Unlock instant, AI-driven research and patent intelligence for your innovation.

Tungsten-niobium co-doped vanadium dioxide powder and preparation method

A vanadium dioxide, vanadium dioxide nanotechnology, applied in the field of materials, can solve the problems of high powder phase transition temperature, low thermochromic performance and other needs

Active Publication Date: 2021-06-08
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the existing doped VO 2 The powder phase transition temperature is high, and the thermochromic performance is low, which does not meet the needs of use. A tungsten-niobium co-doped vanadium dioxide powder and its preparation method are provided.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tungsten-niobium co-doped vanadium dioxide powder and preparation method
  • Tungsten-niobium co-doped vanadium dioxide powder and preparation method
  • Tungsten-niobium co-doped vanadium dioxide powder and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A vanadium dioxide nanopowder doped with tungsten and niobium has a particle size of 20nm to 30nm and is a spherical single crystal particle. The phase transition point can be adjusted at -30°C to 68°C. The film prepared by the vanadium dioxide powder has good thermochromic performance, wherein the visible light integral transmittance is close to 60%, and the solar energy modulation rate is close to 15%.

[0069] A method for preparing vanadium dioxide powder co-doped with tungsten and niobium, comprising the steps of:

[0070] (1) 23.26g VOSO 4 Disperse the powder into 400mL of deionized water, heat the suspension to ~65°C, stir at constant temperature for 10min, then add 6mL of hydrazine hydrate (N 2 h 4 ·H 2 O, 80%wt%) and 42mL of water mixture was slowly added dropwise to VOSO 4 In suspension, the suspension changes from dark blue to light blue. After the suspension is stable, continue to stir for 15 minutes, then slowly drop 9.28g NaOH and 232mL water into the...

Embodiment 2

[0076] A vanadium dioxide nanopowder doped with tungsten and niobium has a particle size of 20nm to 30nm and is a spherical single crystal particle. The phase transition point can be adjusted at -30°C to 68°C. The film prepared by the vanadium dioxide powder has good thermochromic performance, wherein the visible light integral transmittance is close to 60%, and the solar energy modulation rate is close to 15%.

[0077] A method for preparing vanadium dioxide powder co-doped with tungsten and niobium, comprising the steps of:

[0078] (1) 23.26g VOSO 4 Powder, 0.4344g of ammonium tungstate and 0.193g of niobium pentachloride were dispersed in 400mL of deionized water, the suspension was heated to ~65°C, stirred at constant temperature for 10min, and 6mL of hydrazine hydrate (N 2 h 4 ·H 2 O, 80%wt%) and 42mL of water mixture was slowly added dropwise to VOSO 4 In suspension, the suspension changes from dark blue to light blue. After the suspension is stable, continue to st...

Embodiment 3

[0084] A vanadium dioxide nanopowder doped with tungsten and niobium has a particle size of 20nm to 30nm and is a spherical single crystal particle. The phase transition point can be adjusted at -30°C to 68°C. The film prepared by the vanadium dioxide powder has good thermochromic performance, wherein the visible light integral transmittance is close to 60%, and the solar energy modulation rate is close to 15%.

[0085] A method for preparing vanadium dioxide powder co-doped with tungsten and niobium, comprising the steps of:

[0086] (1) 23.26g VOSO 4 Disperse the powder into 400mL of deionized water, heat the suspension to ~65°C, stir at constant temperature for 10min, then add 6mL of hydrazine hydrate (N 2 h 4 ·H 2 O, 80%wt%) and 42mL of water mixture was slowly added dropwise to VOSO 4In suspension, the suspension changes from dark blue to light blue. After the suspension is stable, continue to stir for 15 minutes, then slowly drop 9.28g NaOH and 232mL water into the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Phase transition pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a tungsten-niobium co-doped vanadium dioxide powder and a preparation method. A powder prepared by a one-step hydrothermal method is subjected to liquid-phase annealing treatment, the stoichiometry and crystallinity of the doped powder are controlled, and the high-quality tungsten-niobium co-doped vanadium dioxide powder can be controllably prepared by a two-step hydrothermal method. By adjusting the concentration and doping amount of a precursor solution, the shape, the phase transition temperature and the optical performance of the doped vanadium dioxide powder are regulated and controlled. The VO2-doped nano powder prepared by the preparation method is low in phase change temperature (can be reduced to 0 DEG C or below), and meanwhile, excellent thermochromic performance is kept. According to the preparation technology, the preparation cost is greatly saved, batch controllable preparation of the tungsten-niobium co-doped vanadium dioxide powder can be achieved, and application of vanadium dioxide in the field of temperature control is promoted.

Description

technical field [0001] The invention relates to a tungsten-niobium co-doped vanadium dioxide powder and a preparation method thereof, belonging to the technical field of materials. Background technique [0002] Vanadium dioxide (VO 2 ) can undergo a reversible metal-insulator phase transition (MIT) at about 68°C. Before and after the phase transition, there will be a sudden change in conductivity and infrared transmittance. The change in conductivity can reach 4-5 orders of magnitude, and the infrared transmittance The change can reach more than 50%. The sudden change of electrical and optical properties of vanadium dioxide in the reversible phase transition process makes it have good application prospects in many fields. The current research directions mainly include temperature-controlled smart window materials, optical storage devices, laser protection and optoelectronics. switches, etc., where the VO 2 As a temperature-controlled smart window material, it is a researc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01G31/02B82Y40/00
CPCC01G31/02B82Y40/00C01P2004/32C01P2002/72C01P2004/03C01P2004/04C01P2002/88
Inventor 金海波常晴峰李静波王丹李东来
Owner BEIJING INSTITUTE OF TECHNOLOGYGY