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Preparation method of rutile phase vanadium dioxide nanowire and application

A technology of vanadium dioxide nanometer and rutile phase, which is applied in the direction of vanadium oxide, nanostructure manufacturing, nanotechnology, etc., can solve the problems such as rutile phase vanadium dioxide nanowires that have not yet been seen, and achieve low production cost, simple preparation process, easy to control effects

Inactive Publication Date: 2012-10-31
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

Most of the prepared rutile phase powders are in the form of powder and rods, and there is no report on the one-step hydrothermal synthesis of rutile phase vanadium dioxide nanowires.

Method used

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  • Preparation method of rutile phase vanadium dioxide nanowire and application
  • Preparation method of rutile phase vanadium dioxide nanowire and application
  • Preparation method of rutile phase vanadium dioxide nanowire and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Disperse 3.64g of vanadium pentoxide powder in 200g of 0.1M aqueous oxalic acid solution, stir vigorously for 10 minutes, weigh a certain amount of ammonium molybdate and add it to the above solution, the molar ratio of ammonium molybdate to vanadium ions is 4:100 , to obtain an aqueous solution of vanadium ions with a molar concentration of 0.2mol / L, add the above solution into a 250ml hydrothermal kettle with a filling ratio of 80%, raise the temperature to 200°C, keep it warm for 96 hours, synthesize it through hydrothermal reaction, and then put the hydrothermal kettle Take it out, put it into a water bath cooling tank, and cool it quickly so that the cooling rate is 1min. It drops to 60°C within 1min. Then it is naturally cooled to room temperature, centrifuged, washed with deionized water, and dried in an oven at 70°C for 24h. The rutile phase vanadium dioxide nanowires were obtained.

[0039] After testing, get figure 1 with figure 2 , figure 1 The surface ob...

Embodiment 2

[0043] Add 4.5g of oxalic acid (2M) into 180ml of vanadyl dichloride aqueous solution with a concentration of 0.005mol / L, stir vigorously for 10 minutes, weigh a certain amount of sodium tungstate and add it to the above solution, the molar ratio of sodium tungstate to vanadium ions is 2 : 100, to obtain molar concentration is the vanadium ion aqueous solution of 0.005mol / L, above-mentioned solution is added in the 250ml hydrothermal kettle, and filling ratio is 72%, is warming up to 280 ℃, is incubated 0 hour, synthesizes through hydrothermal reaction, then water Take out the hot kettle, put it into a water bath cooling tank, and cool it quickly so that the cooling rate drops to 60°C within 1min. Then cool it down to room temperature naturally, then centrifuge it, wash it with deionized water, and dry it in an oven at 70°C After 24 hours, the rutile phase vanadium dioxide nanowires were obtained.

[0044] detected image 3 , image 3 It is the XRD spectrum of the rutile pha...

Embodiment 3

[0050] Prepare 150ml of vanadyl oxalate aqueous solution with a molar concentration of 0.1mol / L, stir vigorously for 10 minutes, add the above solution into a 250ml hydrothermal kettle with a filling ratio of 60%, raise the temperature to 350°C, keep it warm for 1 hour, and undergo hydrothermal reaction Synthesize, then take out the hydrothermal kettle, put it into a water bath cooling tank, first cool it rapidly, so that the cooling rate drops to 80°C within 1min., then naturally cool to room temperature, centrifuge, wash with deionized water, and drying in an oven at 70° C. for 24 hours to obtain rutile phase vanadium dioxide nanowires.

[0051] After detection, the obtained rutile phase vanadium dioxide nanowire has a diameter of 30 nm, a length of 10-20 μm, and a phase transition temperature of 70° C.

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Abstract

The invention belongs to the field of inorganic functional material, relating to a preparation method of rutile phase vanadium dioxide nanowire. In the preparation method, vanadium ion aqueous solution or suspension of which the molar concentration is 0.005-0.2 mol / L is prepared firstly; then, doping agent is added to carry out ultrasonic dispersion; the obtained liquid is added into a hydrothermal kettle and is synthetized by a hydrothermal reaction; the hydrothermal kettle is taken out and is naturally cooled to room temperature after being quickly chilled; the obtained product is decentralized, washed and dried to obtain the rutile phase vanadium dioxide nanowire. The rutile phase vanadium dioxide nanowire with favourable crystallinity can be obtained by changing vanadium ion compound and density thereof and controlling conditions, such as reaction temperature and time, packing ratio, doping agent addition, cooling speed and the like. The length-diameter ratio of the prepared rutile phase vanadium dioxide nanowire can be controllably adjusted between dozens and thousands. The obtained nanowire can be applied in the fields of intelligent window coatings, temperature control devices, optoelectronic switches, thermistors, optical information storage and the like.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and relates to a preparation method of rutile-phase vanadium dioxide hollow spheres. Background technique [0002] Rutile phase (R phase) vanadium dioxide is a metal oxide with phase transition properties. A reversible phase transition from low temperature monoclinic phase (M phase) to high temperature rutile phase (R phase) occurs at 68°C. Accompanied by this structural change, its electrical conductivity, magnetic susceptibility, light transmittance and other physical properties have undergone drastic changes, making it have a good application prospect in intelligent temperature control films, thermistor materials, and infrared detection materials. Rutile phase vanadium dioxide can not only undergo phase change due to thermal induction, but also can cause changes in optical transmittance and resistivity by laser light, so it can also be used in photoelectric switches (Chinese pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82B3/00
Inventor 高彦峰曹传祥罗宏杰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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