Method for preparing indium tin oxide powder by aqueous solution method

A technology of indium tin oxide and aqueous solution method, which is applied in the fields of tin oxide, chemical instruments and methods, inorganic chemistry, etc., and can solve the problems that the known technology cannot achieve precise preparation, uneven composition, and imprecise preparation

Inactive Publication Date: 2003-04-23
CHENG LOONG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The known solid-state reaction method has the defect of imprecise preparation, and the inventor also found that the finished product obtained by the aqueous solution method also has the defect of imprecise, especially the known aqueous solution method without degumming procedure, the particle size of the obtained product Larger, and the composition is less uniform, in order to better meet the actual needs, the inventor is to carry out research and development, in order to solve the problem that the known technology cannot achieve precision preparation

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  • Method for preparing indium tin oxide powder by aqueous solution method
  • Method for preparing indium tin oxide powder by aqueous solution method
  • Method for preparing indium tin oxide powder by aqueous solution method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one (commercially sold inorganic salt)

[0030] a. Get 50.05g indium nitrate (containing one crystal water, purity 99.99% molecular weight is 318.85) and 5.67g tin chloride (containing five crystal waters, purity 99%, molecular weight is 350.50) and dissolve them in deionized water respectively, and make The final volumes of the solutions were 155 mL and 16 mL respectively, and the concentrations of indium and tin ions were 1.0 M at this time.

[0031] b. Thoroughly mix and stir the above two clear solutions. At this time, the molar ratio of indium tin ions is 95:5.

[0032] c. In the state of stirring, add 35mL concentrated ammonia water (25wt%) quickly, so that the originally clear solution produces white precipitate, and the pH value at this time is 7.25.

[0033] c1. The above solution containing the white precipitate was continuously stirred for at least 12 hours.

[0034] d. Filter the water from the above solution by vacuum filtration to obtain a wh...

Embodiment 2

[0039]Embodiment two (the metal of commercial sale is made inorganic salt)

[0040] a. Take 25.02g metal indium (purity 99.99% molecular weight 114.8), dissolve it in 100mL concentrated nitric acid (70wt%), add appropriate amount of deionized water, make the final volume of the solution be 218mL, and the indium ion concentration at this time is 1.0M. Get 7.94g of tin chloride (containing five crystal waters, purity 99%, molecular weight 350.50) and dissolve it in deionized water, and make the final volume of the solution 22mL, so that the concentration of indium and tin ions are each 1M.

[0041] b. Thoroughly mix and stir the above two clear solutions. At this time, the molar ratio of indium tin ions is 95:5.

[0042] c. In the state of stirring, add 75mL concentrated ammonia water (25wt%) quickly, so that the originally clear solution produces white precipitate, and the pH value is 7.11 at this time.

[0043] c1. The above solution containing the white precipitate was cont...

Embodiment 3

[0049] Embodiment three (metal dissolves into inorganic salt with acid) (comparative known implementation)

[0050] a. Take 25.11g metal indium (purity 99.99%, molecular weight is 114.8), dissolve in 100mL concentrated nitric acid (70wt%), add appropriate amount of deionized water, make the final volume of the solution be 218mL, and the indium ion concentration is 1.0M at this moment. Get 7.96g tin chloride (containing five crystal waters, purity 99%, molecular weight is 350.50) and dissolve in deionized water, and make the final volume of solution be 22mL, make indium, tin ion concentration each be 1M.

[0051] b. Thoroughly mix and stir the above two clear solutions. At this time, the molar ratio of indium tin ions is 95:5.

[0052] c. In the state of stirring, add 100mL concentrated ammonia water (25wt%) quickly, so that the originally clear solution produces white precipitate, and the pH value is now 7.16.

[0053] c1. The above solution containing the white precipitate ...

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Abstract

The preparation method of tin indium oxide powder includes the following steps: using water and proper additive to respectively dissolve indium compound and tin compound in water to prepare two clearsolutions; adding proper additive to produce metal hydroxides with a certain proportion; filtering and water washing, and adding proper additive to make dispergation and making specific components ofdifferent metal hydroxides produce the reaction of hydrolysis and condensation, then drying and calcining so as to obtain high-grade nano tin indium oxide powder with high compactness.

Description

technical field [0001] The invention relates to a method for preparing indium tin oxide powder (hereinafter referred to as ITO) by an aqueous solution method, in particular to making high-quality nano-scale (nanomelter, 10 -9 ) ITO powder. Background technique [0002] Since ITO powder is the raw material for preparing ITO sputtering targets, if you want to obtain high-quality, high-density ITO sputtering targets, you need to form uniform nano-scale ITO powder. [0003] Indium Tin Oxide ITO (Indium Tin Oxide) is a tin-doped indium oxide, commonly known as indium tin oxide, which belongs to n-type semiconductors. Since tin with one more valence electron than indium is doped into the original oxide In indium, the electron concentration of free carriers increases, thereby improving its conductivity. [0004] The thin film made of ITO has high conductivity, high transmittance to visible light, and high reflectivity to infrared rays, so it is widely used in transparent electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02C01G15/00C01G19/02C22B7/00
CPCY02P10/20
Inventor 卢信冲许家豪林逸樵翁建隆
Owner CHENG LOONG CORPORATION
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