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Method for preparing nano needle-shaped purple tungsten powder

A nanoneedle and violet tungsten technology, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of insufficient phase purity of reaction products, long-term reaction, and low quality of violet tungsten, and achieve High surface activity, good dispersibility, low cost effect

Active Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the mechanical mixing of this method, it will cause uneven mixing and insufficient phase purity of the reaction product; at the same time, the calcination temperature is high, and the resulting product particles are relatively large
Zhou (J.Mater.Chem.A, 2014, 2, 4347-4354) prepared nano-violet tungsten by hydrothermal synthesis method. 6 Mix with ethanol and react in a reactor at 180°C for 24 hours. Although nano-scale violet tungsten can be obtained, it takes a long time to react, and the quality of violet tungsten produced each time is very small.

Method used

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  • Method for preparing nano needle-shaped purple tungsten powder
  • Method for preparing nano needle-shaped purple tungsten powder

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Experimental program
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Effect test

Embodiment 1

[0020] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.24mol, thiourea (CN 2 h 4 S) 0.05mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then heat at a constant temperature of 200°C. After the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds, releasing a large amount of gas to form violet tungsten. The obtained powder is in the shape of nano needles, with a diameter of 30-100 nm and a length of 0.5-5 μm.

Embodiment 2

[0022] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 ) 0.36mol, thiourea (CN 2 h 4 S) 0.05mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then heat at a constant temperature of 200°C, and after the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds to release a large amount of gas to form violet tungsten. The obtained powder is in the shape of nano needles, with a diameter of 70-150 nm and a length of 0.5-3 μm.

Embodiment 3

[0024] Weigh ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.36mol, urea (CO(NH 2 ) 2 )0.05mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, then heat at a constant temperature of 200°C. After the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds, releasing a large amount of gas to form violet tungsten. The obtained powder is in the shape of nano needles, with a diameter of 20-75 nm and a length of 0.5-5 μm.

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Abstract

The present invention, belonging to the technical field of advanced power metallurgy preparation, relates to a method for preparing a nano needle-shaped purple tungsten powder. The nano needle-shaped purple tungsten powder disclosed by the present invention has a diameter of 20-200 nm, a length of 0.5-10 micro m, and a length-diameter ratio of 5-300. In addition, the present invention discloses a method for preparing nan purple tungsten. According to the method, the purple tungsten is synthesized in one step by a solution process. Therefore, the reaction time is short, and the reaction initiation temperature is low. A large quantity of gases are produced in the reaction course, and sufficient contact with air is impeded, so that the generated product, namely, the purple tungsten, is relatively single, favorable to the subsequent utilization of the powder. The method according to the present invention solves the problem that the particle size of the purple tungsten powder prepared through the calcination of a traditional rotary furnace is coarse and large. In addition, the method according to the present has higher efficiency for preparing the nanometer purple tungsten compared with other methods; and has the advantages of high efficiency, low cost, high utilization rate of raw material powder and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a preparation method of nano-acicular violet tungsten powder. Background technique [0002] Metal oxide semiconductor materials have various excellent properties and play a very important role in human life. In recent years, how to reduce the production cost of semiconductor materials and improve the energy conversion rate has become a research hotspot. Tungsten oxide, as a semiconductor material (with a bandgap energy of 2.4-2.8eV), is widely used in photoelectrochemistry. Among them, violet tungsten (W 18 o 49 ) has attracted special attention by researchers because of its unique properties and structure. Monoclinic violet tungsten has the largest degree of oxygen defect structure, and yellow tungsten (WO 3 ), blue tungsten (WO 2.9 ) compared with violet tungsten, which has a special surface structure and the highest chemical activity, and is suitable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y30/00B82Y40/00
Inventor 秦明礼陈鹏起陈铮李睿鲁慧峰吴昊阳贾宝瑞丁向莹曲选辉
Owner UNIV OF SCI & TECH BEIJING
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