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A kind of preparation method of reduced tungsten oxide nanosheet

A technology of tungsten oxide and nanosheets, which is applied in the field of preparation of reduced tungsten oxide nanosheets, can solve the problems of high airtightness requirements of equipment, inability to realize mass production, and high price of tungsten sources, and achieve low equipment requirements, uniform size, The Effect of Green Costs

Active Publication Date: 2018-06-22
江西善纳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method requires a high-temperature and high-pressure environment, which requires high airtightness of the equipment, and the price of the tungsten source used is relatively high, which greatly increases the cost. In addition, the samples synthesized by the solvothermal method are very limited and cannot be mass-produced.

Method used

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  • A kind of preparation method of reduced tungsten oxide nanosheet
  • A kind of preparation method of reduced tungsten oxide nanosheet
  • A kind of preparation method of reduced tungsten oxide nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First weigh 25 g of sodium tungstate dihydrate and 15 g of citric acid, put them into the ball milling jar of a planetary ball mill, mill for 2 hours, take out the samples and balls, 60 o C dried for 2 hours, and then ball milled for 2 hours. After washing, filtering and drying, the precursor product is obtained. Put the precursor into a reduction furnace at 5% H 2 / N 2 Under gas, raise the temperature to 500°C and keep it for 2 hours to obtain reduced tungsten oxide.

Embodiment 2

[0024] First weigh 25 g of sodium tungstate dihydrate and 15 g of tartaric acid, put them into the ball mill jar of a planetary ball mill, mill for 1.5 hours, take out the sample and the balls, 60 o C dried for 2 hours, and then ball milled for 2 hours. After washing, filtering and drying, the precursor product is obtained. Put the precursor into a reduction furnace at 5% H 2 / N 2 Under gas, raise the temperature to 600°C and keep it for 2 hours to obtain reduced tungsten oxide.

Embodiment 3

[0026] First weigh 25g of ammonium paratungstate and 10g of oxalic acid, put them into the planetary ball mill ball mill jar, ball mill for 2 hours, take out the sample and the ball, 60 o C dried for 2 hours, and then ball milled for 1 hour. After washing, filtering and drying, the precursor product is obtained. Put the precursor into a reduction furnace at 5% H 2 / N 2 Under gas, raise the temperature to 600°C and keep it for 2 hours to obtain reduced tungsten oxide.

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Abstract

The invention discloses a method for preparing reduced-oxidized tungsten oxide nanosheets. The method comprises the following steps: (1) weighing a proper amount of tungstate according to the preparation quantity of reduced tungsten oxide, and weighing a corresponding amount of organic acids according to a molar ratio 1-3 of tungsten in the tungstate to carboxyl in the organic acids; (2) filling the reactants weighed in the step (1) into a ball mill, adding solvents accounting for 1-30% of the mass of the reactants, performing ball milling for 0.5-6 hours, taking out the materials subjected to ball milling and the milling ball, drying at the temperature of 40-100 DEG C for 1-10 hours, and then performing ball milling for 0.5-4 hours; (3) taking out the product obtained in the step (2), washing, filtering and drying; and (4) putting the product obtained in the step (3) into a reduction furnace, and maintaining the temperature to be 400-1000 DEG C for 0.5-6 hours in a reducing gas atmosphere, thereby obtaining the reduced tungsten oxide. The method disclosed by the invention has the characteristics of being readily available in raw materials, simple in equipment, high in synthetic yield, green, environmentally friendly and low in cost, and any additive is not needed.

Description

technical field [0001] The invention belongs to the technical field of metal oxide powder preparation, and relates to a preparation method of reduced tungsten oxide nanosheets. technical background [0002] Nano WO 3 Excellent performance in photochromism, electrochromism, catalysis, etc. Reduced tungsten oxide with different oxygen index is a metal oxide with dark blue metallic luster, usually a metal conductor or semiconductor, and its general formula is WO x (2<x<3), with different x, its color and performance will also be different. Due to its excellent visible light transmittance and infrared shielding performance, nano-reduced tungsten oxide has broad application prospects in glass transparent heat-shielding coatings. [0003] At present, there are many methods for preparing nano-reduced tungsten oxide. Patent CN 102921006 A discloses a synthesis method of reduced tungsten oxide. Tungsten salt is used as tungsten source, organic solvent is added, stirred until ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/02B82Y40/00
CPCC01G41/02C01P2002/72C01P2004/04C01P2004/64C01P2004/90
Inventor 陈伟凡方晓辰尧牡丹郭兰玉
Owner 江西善纳新材料科技有限公司