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A-phase vanadium dioxide nanowire preparation method

A technology of vanadium dioxide nanometer and vanadium pentoxide, which is applied in the field of materials, can solve the problems of A-phase vanadium dioxide preparation operation difficulties, difficult control, and difficulty in obtaining nanowires, etc., and the synthesis method is simple, easy to operate, and easy to control , The effect of good crystallinity of the product

Active Publication Date: 2014-03-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the preparation of A-phase vanadium dioxide reported now is difficult and difficult to control, and it is difficult to obtain ultra-pure A-phase vanadium dioxide nanowires.

Method used

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  • A-phase vanadium dioxide nanowire preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Accurately weigh 0.3g of vanadium pentoxide, 0.2g of oxalic acid and 0.1mL of polyethylene glycol 400 and disperse in 20mL of ultrapure aqueous solution, and vigorously stir at 60°C for 15 minutes at a stirring speed of 300rpm. Add the above solution into a 25mL polytetrafluoroethylene hydrothermal kettle with a filling ratio of 80%, raise the temperature to 240°C with a heating rate of 2.5°C / min, keep it warm for 60h, and finally cool down to room temperature naturally, pass through 1L of ultrapure water Wash with 200ml of alcohol, centrifuge and dry in an oven at 80°C for 8 hours to obtain the vanadium dioxide nanowires of phase A. Such as figure 1 For the measured XRD pattern, figure 2 It is a SEM topography picture. It can be seen that its length is 1-6 μm, its diameter is 20-300 nm, and its aspect ratio is 20:1-50:1.

Embodiment 2

[0034] Accurately weigh 0.3g of vanadium pentoxide, 0.2g of oxalic acid and 0.1mL of polyethylene glycol 600 and disperse in 20mL of ultrapure aqueous solution, and vigorously stir at 60°C for 15 minutes at a stirring speed of 300rpm. Add the above solution into a 25mL polytetrafluoroethylene hydrothermal kettle with a filling ratio of 80%, raise the temperature to 230°C with a heating rate of 2.5°C / min, keep it warm for 50h, and finally cool down to room temperature naturally, pass through 1L of ultrapure water After washing with 200ml alcohol, centrifuge and dry in an oven at 80°C for 8 hours to obtain phase A vanadium dioxide nanowires with a length of 1-10μm, a diameter of 20-400nm, and an aspect ratio of 25:1- 50:1.

Embodiment 3

[0036] Accurately weigh 0.3g of vanadium pentoxide, 0.2g of oxalic acid and 0.1g of polyethylene glycol 2000 and disperse in 20mL of ultrapure aqueous solution, and vigorously stir at 60°C for 15 minutes at a stirring speed of 300rpm. Add the above solution into a 25mL polytetrafluoroethylene hydrothermal kettle with a filling ratio of 80%, raise the temperature to 225°C at a heating rate of 2.5°C / min, keep it warm for 48h, and finally cool down to room temperature naturally, and pass through a large amount of 1L ultra-pure After washing with water and 200ml alcohol, centrifugal separation, and drying in an oven at 80° C. for 8 hours, the vanadium dioxide nanowires of phase A were obtained. Such as image 3 It is the measured SEM topography picture, its length is 5-30μm, diameter is 50-500nm, aspect ratio is 100:1-20:1.

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Abstract

The invention provides an A-phase vanadium dioxide nanowire preparation method. The A-phase vanadium dioxide nanowire preparation method is characterized in that due to the addition of a surface active agent, an intermediate phase B can be rapidly converted into A-phase vanadium dioxide, and an A-phase vanadium dioxide nanowire with excellent morphology and draw ratio is formed; the prepared A-phase vanadium dioxide nanowire is very pure and stable. The preparation method is simple in raw materials, convenient to operate and easy to control; the crystallinity of the product is good; the nanowire can be widely applied to the fields such as batteries, hydrogen storage, photoelectric switches and the like.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of phase A vanadium dioxide nanowires. Background technique [0002] There are many kinds of vanadium oxides, and vanadium dioxide, a tetravalent oxide, has many different structures, such as rutile phase structure (R), monoclinic phase structure (M), triclinic phase structure (T), and intermediate phase structure. Phase A and B. The vanadium dioxide of the M / R phase has been widely studied due to its metal-insulator phase transition near room temperature (68°C), but the A-phase vanadium dioxide with the same phase transition properties has been rarely studied, mainly because the phase A The preparation of vanadium dioxide is difficult. So far, only the method of hydrothermal synthesis can obtain phase A vanadium dioxide, and the vanadium dioxide of phase A is unstable, and it is even more difficult to prepare purer phase A vanadium dioxide. ...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y30/00
Inventor 刘向力王成迁
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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