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Preparation method of nanometer grade indium tin oxide composite powder

A technology of indium tin oxide and composite powder, which is applied in the field of preparing nano-scale indium tin oxide composite powder, to achieve the effects of reducing cost, eliminating agglomeration and reducing emulsification process

Inactive Publication Date: 2009-10-28
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention can overcome the influence of additives on the purity in the process of preparing ITO powder by the aqueous solution method, and solve the problem of particle size control and dispersion of ultrafine powder, thereby providing an industrial scale with uniform particle size, controllability, fluffiness and good dispersibility Nanoscale high-purity ITO composite powder preparation method

Method used

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  • Preparation method of nanometer grade indium tin oxide composite powder
  • Preparation method of nanometer grade indium tin oxide composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a. Take 22.964 grams of metal indium (purity 99.99%) and dissolve it in the superior pure nitric acid aqueous solution, take 7.02 grams of SnCl 4 ·5H 2 O (purity 99.99%) was dissolved in an appropriate amount of deionized water.

[0023] b. The above two solutions are fully mixed and stirred, and an appropriate amount of deionized water is added. At this time, the concentration of indium and tin ions in the mixed solution is 0.8M.

[0024] c. Under the condition of vigorously stirring the mixed solution, add high-grade pure sodium bicarbonate to make the pH value of the solution 7-11. At this time, the clarified solution produces indium tin coprecipitate, and the stirring is continued for 2 hours.

[0025] d. Filter the supernatant by centrifugal sedimentation to obtain the indium-tin co-precipitate filter cake, then re-stir and wash with deionized water until there is no NO 3 - 、Na + and Cl - ions, analytically pure anhydrous methanol was added after the last filt...

Embodiment 2

[0030] a. Get 55.113 grams of metal indium (purity 99.99%) to be dissolved in the pure aqueous solution of nitric acid, and get 5.832 grams of metal tin (purity 99.99%) to be dissolved in the pure aqueous solution of sulfuric acid.

[0031] b. The above two solutions are fully mixed and stirred, and an appropriate amount of deionized water is added. At this time, the concentration of indium and tin ions in the solution is 0.4M.

[0032] c. Under the condition of vigorously stirring the mixed solution, add high-grade pure ammonium carbonate to make the pH value of the solution 7-11. At this time, the clarified solution produces indium tin coprecipitate, and the stirring is continued for 2 hours.

[0033] d. Filter the supernatant by centrifugal sedimentation to obtain the indium-tin co-precipitate filter cake, then re-stir and wash with deionized water until there is no NO 3 - , NH 4 + and SO 42- ions, analytical grade absolute ethanol was added after the last filtration. ...

Embodiment 3

[0038] a. Get 55.113 grams of metal indium (purity 99.99%) and dissolve in the mixed aqueous solution of nitric acid and hydrochloric acid of superior grade, get 5.832 grams of metal tin (purity 99.99%) and dissolve in the superior grade of pure sulfuric acid aqueous solution.

[0039] b. The above two solutions are fully mixed and stirred, and an appropriate amount of deionized water is added. At this time, the concentration of indium and tin ions in the solution is 0.5M.

[0040] c. Under the condition of vigorously stirring the mixed solution, add high-grade pure ammonium bicarbonate to make the pH value of the solution 7-11. At this time, the clarified solution produces indium tin coprecipitate, and the stirring is continued for 2 hours.

[0041] d. Filter the supernatant by centrifugal sedimentation to obtain a white indium-tin co-precipitate filter cake, then re-stir and wash with deionized water, and repeat the washing until there is no NO 3 - , NH 4 + and SO 4 2- ...

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Abstract

The present invention is a process for preparing nano-scale indium tin oxide composite powder by co-precipitation method, which is characterized in that metal indium, metal tin, or soluble metal indium salt and metal tin salt are respectively dissolved by inorganic single strong acid or mixed strong acid aqueous solution Dissolve in water, mix the prepared two solutions, add a precipitant under the condition of vigorously stirring the mixed solution to produce indium tin coprecipitate, after washing with water, organic solvent washing and solid-liquid separation, add an organic solvent for azeotropic distillation, the filter cake Ultrafine ITO composite powder is obtained by drying, breaking up and calcining. The indium tin oxide powder prepared by the process of the present invention is fired by a simple process, and the relative theoretical density of the ITO target can reach more than 99%.

Description

technical field [0001] The invention relates to a method for preparing nano-scale indium tin oxide composite powder (ITO) by co-precipitation method. The ITO composite powder prepared by the method is suitable for preparing an ITO target material for optical function display coating. Background technique [0002] ITO powder is the raw material for preparing ITO sputtering coating targets. To obtain high-quality and high-density ITO sputtering targets, uniform ultra-pure and ultra-fine ITO powders are required. [0003] The traditional method of preparing ITO powder: one is to mix the powder of indium oxide and tin oxide mechanically, and then calcined to obtain it. Due to the agglomeration of particles, the mixing uniformity of different oxides in the ITO powder is limited, which affects the quality of the ITO target, and then affects the conductivity, light transmission and adhesion to the substrate of the ITO film. Another method used to prepare ultrafine composite powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/23C03C17/25
Inventor 刘家祥李敏王海宁朱丽杨儒
Owner BEIJING UNIV OF CHEM TECH
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