Preparation method of nanoscale indium tin oxide powder

A nano-scale technology of indium tin oxide, applied in tin oxide, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as low sintering activity, impurity in ITO powder, complex process, etc.

Inactive Publication Date: 2011-10-12
北京冶科纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the metal tin is extremely unstable during the dissolution process, and it cannot completely guarantee that the metal tin dissolves into tetravalent tin ions, which affects the effect of tin doping, so that the prepared ITO powder has impurity
The process of preparing ITO powder by this method is complicated, the generated powder is easy to agglomerate, and the sintering activity is not high, which is not conducive to atmospheric pressure sintering

Method used

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  • Preparation method of nanoscale indium tin oxide powder
  • Preparation method of nanoscale indium tin oxide powder
  • Preparation method of nanoscale indium tin oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 99.995% metal indium is dissolved with superior grade pure hydrochloric acid, SnCl 4 ·5H 2 O is dissolved in water to make a tin salt solution, and then the indium salt solution and the tin salt solution are separated according to In 2 o 3 :SnO 2 (wt%)=90:10, prepare indium tin salt solution for future use. Then keep the temperature of the solution between 70-90°C, add 0.25wt% PEG as a dispersant, after stirring evenly, add urea dropwise at a uniform speed to pH = 7.5, and then stir for 2 hours to completely precipitate the hydroxide. Ultrasonic vibration is applied with a frequency of 28MHz. After the reaction was completed, the precipitate was filtered, washed, and vacuum-dried for 3 hours, and then calcined in a calciner at 600°C for 4 hours to obtain ITO powder, which had a single In 2 o 3 Body-centered cubic crystal structure, transmission electron microscope photos show that the powder has good dispersion and rarely agglomerates.

[0016] The specific surfa...

Embodiment 2

[0018] 99.995% metal indium is dissolved with superior grade pure hydrochloric acid, SnCl 4 ·5H 2 O is dissolved in water to make a tin salt solution, and then the indium salt solution and the tin salt solution are separated according to In 2 o 3 :SnO 2 (wt%)=90:10, prepare indium tin salt solution for future use. Keep the temperature of the solution between 70-90°C, add 0.25wt% of D900 and PAA as a dispersant, after stirring evenly, add urea dropwise at a uniform speed to pH = 7.5, and then stir for 2 hours to completely precipitate the hydroxide. Ultrasonic vibration is applied in the middle, the frequency is 28MHz. After the reaction was completed, the precipitate was filtered, washed, and vacuum-dried for 3 hours, and then calcined in a calciner at 600°C for 4 hours to obtain ITO powder, which had a single In 2 o 3 Body-centered cubic crystal structure, transmission electron microscope photos show that the powder has good dispersion and rarely agglomerates.

[0019]...

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Abstract

The invention discloses a preparation method of nanoscale indium tin oxide (ITO) powder. The ITO powder prepared by the method is less in agglomeration and is good in flowability, and is easy to mold. The method is characterized in that urea is selected as a precipitator, and a hydroxide precursor is prepared by a chemical precipitation method; and in the preparation process, a ceramic dispersing agent is added, ultrasonic wave is applied to a reaction system, and then washing, filtration, drying and calcination are carried out so as to obtain the ITO powder.

Description

technical field [0001] The invention relates to a method for preparing nano-scale indium tin oxide powder by co-precipitation method. The indium tin oxide powder prepared by the method has less agglomeration, good fluidity, and is easy to be pressed and formed, and is suitable for preparing an indium tin oxide target material for high-density coating. Background technique [0002] Indium tin oxide, referred to as ITO, is an important material of the indium series, and more than 70% of indium in the world is used to produce this material. ITO ultrafine powder is a composite powder formed by doping a certain amount of tin oxide into indium oxide, and is an n-type wide bandgap semiconductor. The reflectance of the ITO thin film made with it is greater than 70% for infrared rays, the absorption rate for ultraviolet rays is greater than 85%, and the transmittance for visible light is greater than 90%. As a transparent electrode material, ITO is widely used in liquid crystal dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00C01G19/02
Inventor 盖伟李玉新段静芳尹凯
Owner 北京冶科纳米科技有限公司
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