Process for producing indium oxide nanocrystalline with controlled shape

A nanocrystal and indium oxide technology, which is applied in the preparation of indium oxide nanocrystals and in the field of nanomaterials, can solve problems such as easy collapse and difficult control of sample morphology, and achieve avoiding hard agglomeration, uniform morphology, and avoiding grain growth Effect

Inactive Publication Date: 2008-01-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the temperature required for the liquid-phase method is relatively low, which is beneficial to large-scale production. However, the liquid-phase method reported in the literature mainly includes the precipitation method and the hydrothermal / solvothermal method. In order to obtain the final product, a calcination step is required. , the shape of the sample is difficult to control, it is easy to collapse, and the formed crystal is polycrystalline

Method used

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  • Process for producing indium oxide nanocrystalline with controlled shape
  • Process for producing indium oxide nanocrystalline with controlled shape
  • Process for producing indium oxide nanocrystalline with controlled shape

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Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1, 1.6g In(NO 3 ) 3 4.5H 2 O (99.5%) was dissolved in 40ml of methanol and stirred magnetically, and 1.2g of NaOH was dissolved in another 40ml of methanol, and the latter was slowly dropped into the former solution, and a white precipitate would appear. After the titration is complete, continue to stir for 1 hour, then transfer all the obtained suspension into a hydrothermal kettle with a volume of 100ml, seal it, put it into an oven or muffle furnace and raise the temperature to 250°C at a rate of 5°C / min, and keep it warm for 10 hour, then cooled naturally, took out the reaction kettle, washed the obtained light yellow precipitate with deionized water and absolute ethanol several times, and finally filtered with suction, dried the filter cake at 80°C for 10 h, and ground to obtain the final product. (Figure 1-4)

Embodiment 2

[0043] Embodiment 2, 1.6g In(NO 3 ) 3 4.5H 2 O (99.5%) was dissolved in 40ml ethanol, and magnetically stirred, and 1.2g NaOH was dissolved in another 40 ml ethanol, and the latter was slowly dropped into the former solution, and a white precipitate would appear. After the titration is complete, continue to stir for 1 hour, then transfer all the obtained suspension into a hydrothermal kettle with a volume of 100ml, seal it, put it in an oven or muffle furnace and raise the temperature to 200°C at a rate of 8°C / min, and keep it warm for 30 hour, then cooled naturally, took out the reaction kettle, washed the obtained light yellow precipitate with deionized water and absolute ethanol several times, and finally filtered with suction, dried the filter cake at 80°C for 10 h, and ground to obtain the final product. (Figure 5-6)

Embodiment 3

[0044] Embodiment 3, 0.8g In(NO 3 ) 3 4.5H 2 O (99.5%) and 0.04gFe (NO 3 ) 3 9H 2 O was dissolved in 20ml of methanol, and magnetically stirred, and another 0.6g of NaOH was dissolved in another 20ml of methanol, and the methanol solution of NaOH was slowly dropped into the former solution, and a light yellow precipitate appeared. After the titration was complete, continue to stir for 1 hour , and then transfer all the obtained suspension into a hydrothermal kettle with a volume of 100ml, seal it, put it in an oven or muffle furnace and raise the temperature to 250℃ at a rate of 5℃ / min, keep it warm for 25 hours, then cool naturally, and take out the reaction kettle , wash the obtained light blue precipitate with deionized water and absolute ethanol several times, and finally filter with suction, dry the filter cake at 80° C. for 10 h, and grind to obtain the final product. (Figure 7-9)

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Abstract

A method for preparing indium oxide nanometer crystal with controllable shape is provided, which is characterized in that methyl alcohol or ethanol solution in form of compound of indium is taken as precursor, alcoholysis is carried out in methyl alcohol or ethanol solution containing NaOH or KoH, then the alcoholized suspension is placed into a reaction vessel to carry out super alcohol thermal reaction. The indium concentration percentage by mass in the precursor is 0.5-10%, or the adulterant in the precursor is 0.1-10at%, the transitional metallic ions are prepared into non-doped or doped indium oxide nanometer crystal, which is in cubic or bar shape, the yield is up to 80%. The magnesium of the doped In2O3 can be adjusted by the doping volume, alcohol thermal time and temperature.

Description

technical field [0001] The invention relates to a method for preparing indium oxide nanocrystals with controllable morphology, more precisely, the invention is a method for preparing indium oxide nanocubes or nanorods by using a simple solvothermal method using indium compounds as raw materials , belonging to the category of nanomaterials. Background technique [0002] Indium oxide (In 2 o 3 ) is an important semiconductor material, its direct bandgap width is about 3.6eV, and its indirect bandgap width is about 2.6eV. Indium oxide is widely used in the field of microelectronics, such as optoelectronic devices, solar cells, liquid crystal displays and gas sensors. Pure indium oxide has relatively weak conductivity. After doping Sn, the visible light transmittance of the thin film is greatly improved. Since the 1960s, Sn-doped indium oxide has become the main transparent conductive material, and no other material can replace it so far. After entering the 1970s, with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/00C30B7/14C30B29/16C01G15/00
CPCC30B7/00
Inventor 曾宇平储德韦江东亮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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