Method for preparing tin-doped indium oxide nano powder

A tin-doped indium oxide and nano-powder technology, which is applied in chemical instruments and methods, tin compounds, inorganic chemistry, etc., can solve the problems of reducing powder dispersion performance, reducing the service life of components, and corrosion in the use environment, so as to eliminate Removal of problems, less agglomeration, good dispersion effect

Inactive Publication Date: 2006-05-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
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  • Claims
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Problems solved by technology

However, since the raw materials used contain a large amount of chloride ions, it is very difficult to remove the chloride ions in the co-precipitated product in a limited number of washings (the increase in the number of washings will cause the loss of the product), and the residual chloride ions will cause a lot of damage to the powder. Severe agglomeration, reducing the dispersion performance of the powder
In addition, residual chlorine ions will also have a serious corrosion effect on the use environment and reduce the service life of components

Method used

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Examples

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preparation example Construction

[0012] The preparation method of said tin-doped indium oxide nanopowder in the present invention comprises the following steps:

[0013] (1) Dissolve the water-soluble tin-containing compound and the water-soluble indium-containing compound in deionized water at 20-90°C under stirring conditions, so that the concentration of indium ions in the solution is 0.01-5mol / L (tin ions and indium ions The molar ratio is 3~15:100);

[0014] (2) carry out precipitation reaction at 30~90 ℃ with the aqueous solution containing tin ion and indium ion obtained by step (1) and the ammoniacal liquor with concentration of 1~12mol / L, the feeding method of precipitation reaction: can be to contain indium and tin The aqueous solution of ions is added dropwise to the ammonia solution, or the aqueous solution containing indium and tin ions and ammonia water are added dropwise to deionized water, or the ammonia water is added dropwise to the aqueous solution containing indium and tin ions;

[0015] ...

Embodiment 1

[0018] Under the condition of 20°C, 10g of indium sulfate and the molar ratio of tin and indium are 3:100, weigh stannous oxalate and dissolve it in deionized water, and prepare the concentration of indium ion as 0.1molL -1 The mixed solution, under vigorous stirring, with 1molL -1 The ammonia water used as a precipitant was slowly added dropwise to the above mixed solution, and the reaction temperature was controlled at 60°C. When the pH value of the system reached 8, the dropwise addition was stopped, and the reaction was stirred for 2 to 10 hours to obtain a pale yellow colloidal precipitation precursor. . The precursor was washed with deionized water and absolute ethanol. The obtained product was dried at 90° C. for 3 hours. Finally, heat-treat the dried powder at 800°C for 6 hours, and the obtained light yellow powder is ITO nano powder. The powder is detected by the X-ray diffraction method, and the (222) crystal plane of the powder is calculated by the Scherrer formu...

Embodiment 2

[0020] Under the condition of 90°C, weigh 25g of indium oxalate and the molar ratio of tin to indium is 8:100, take tin nitrate and dissolve it in deionized water, and prepare the indium ion concentration as 0.01molL -1 The mixed solution, under vigorous stirring, 12molL -1 The ammonia water and the above mixed solution are added dropwise to strongly stirred deionized water at a temperature of 70°C for co-precipitation reaction. The pH value of the system is always controlled at about 5, and the reaction is stirred for 2 to 10 hours to obtain a light yellow gel Precipitate the precursor. The precursor was washed with deionized water and absolute ethanol. The obtained product was dried at 120° C. for 2 hours. Finally, heat-treat the dried powder at 600°C for 4 hours, and the obtained light yellow powder is ITO nano powder. The powder is detected by the X-ray diffraction method, and the (222) crystal plane of the powder is calculated by the Scherrer formula to obtain a grain ...

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Abstract

The invention relates to a method for preparing Sn-doped indium trioxide (ITO) nano powder by coprecipitation method, coprecipitating Sn / In water solution without chlorine ions with ammonia water to prepare the ITO nano powder whose size is 8-3 nanometers and whose specific surface area is 20-60 sq m g-1. The ITO nano powder has the characters of small size, large specific surface area, good dispersivity, not corroding the service parts. Besides, the invention has the advantages of short preparing cycle, high efficiency, low cost, ability to produce in large scale, etc.

Description

technical field [0001] The invention relates to a preparation method of tin-doped indium oxide nano-powder, in particular to a method for preparing tin-doped indium oxide nano-powder by co-precipitation method. Background technique [0002] Tin-doped indium oxide is indium tin oxide material, referred to as ITO. (Indium Tin Oxide) as the most important transparent conductive oxide material at this stage, its role in social life has been irreplaceable by other materials. which has up to 10 5 Ω -1 cm -1 The electrical conductivity is high, and the transmittance in the visible light region reaches more than 80%, and the electrical conductivity is much higher than that of antimony-doped tin oxide (ATO), fluorine-doped tin oxide (FTO) and aluminum-doped zinc oxide (AZO). conductive oxide. The above-mentioned characteristics of ITO make it the most important material for conductive films in liquid crystal display devices (LCD), and it becomes more obvious with the increasing s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00C01G19/00
Inventor 张建荣穆劲刘凌云
Owner EAST CHINA UNIV OF SCI & TECH
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