Preparation method for bismuth ferrite Bi2Fe4O9 monocrystal nanosheets

A technology of single-crystal nanometer and bismuth ferrite, which is applied in nanotechnology, chemical instruments and methods, iron compounds, etc., can solve the problems of poor controllability of reaction, low product purity, difficult control of particle size and shape, etc. Low cost, simple process, good feasibility and controllability

Inactive Publication Date: 2013-12-04
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

[0004] At present, the methods for preparing bismuth-iron compounds mainly use high-temperature solid-phase method and sol-gel method, which have poor reaction controllability and low product purity.
Due to the high temperature calcination process, the particle agglomeration is very serious, and the size and shape of the particles are difficult to control

Method used

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  • Preparation method for bismuth ferrite Bi2Fe4O9 monocrystal nanosheets
  • Preparation method for bismuth ferrite Bi2Fe4O9 monocrystal nanosheets

Examples

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Effect test

example 1

[0020] 1) Weigh ferric nitrate and bismuth amine citrate at a molar ratio of 1:1, add deionized water and nitric acid to make the concentration of nitric acid in the system 1.125mol / L, stir well to form a mixture containing bismuth amine citrate and bismuth amine A clear solution of ferric nitrate;

[0021] 2) Under stirring, add an aqueous potassium hydroxide solution to the clarified solution containing bismuth ammonium citrate and ferric nitrate prepared in step 1), to obtain a suspension containing bismuth and iron oxyhydroxide precipitates;

[0022] 3) Transfer the obtained suspension of oxyhydroxide precipitation containing bismuth and iron to the inner tank of the reactor, adjust the volume of the reaction material in the inner tank of the reactor with deionized water to reach 90% of the volume of the inner tank of the reactor, and stir In 10 minutes, in the reaction mass, the molar concentration of ferric nitrate and bismuth amine citrate was 0.05mol / L, and the molar c...

example 2

[0025] 1) Weigh ferric nitrate and bismuth amine citrate at a molar ratio of 1:1, add deionized water and nitric acid to make the concentration of nitric acid in the system 0.75mol / L, stir well to form a mixture containing bismuth amine citrate and bismuth amine A clear solution of ferric nitrate;

[0026] 2) Under stirring, add an aqueous potassium hydroxide solution to the clarified solution containing bismuth ammonium citrate and ferric nitrate prepared in step 1), to obtain a suspension containing bismuth and iron oxyhydroxide precipitates;

[0027] 3) Transfer the obtained suspension of oxyhydroxide precipitation containing bismuth and iron to the inner tank of the reactor, adjust the volume of the reaction material in the inner tank of the reactor with deionized water to reach 90% of the volume of the inner tank of the reactor, and stir In 30 minutes, in the reaction mass, the molar concentration of ferric nitrate and bismuth amine citrate was 0.05mol / L, and the molar co...

example 3

[0030] 1) Weigh ferric nitrate and bismuth amine citrate at a molar ratio of 1:1, add deionized water and nitric acid to make the concentration of nitric acid in the system 1mol / L, stir well, and form a mixture containing bismuth amine citrate and nitric acid clear solution of iron;

[0031] 2) Under stirring, add an aqueous potassium hydroxide solution to the clarified solution containing bismuth ammonium citrate and ferric nitrate prepared in step 1), to obtain a suspension containing bismuth and iron oxyhydroxide precipitates;

[0032] 3) Transfer the obtained suspension of oxyhydroxide precipitation containing bismuth and iron to the inner tank of the reactor, adjust the volume of the reaction material in the inner tank of the reactor with deionized water to 80% of the volume of the inner tank of the reactor, and stir 60 minutes, in the reaction mass, the molar concentration of ferric nitrate and bismuth amine citrate is 0.05mol / L, and the molar concentration of potassium ...

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Abstract

The invention discloses a preparation method for bismuth ferrite Bi2Fe4O9 monocrystal nanosheets. Ferric nitrate and ammonium bismuth citrate are employed as raw materials. Deionized water and nitric acid are added. An appropriate amount of potassium hydroxide is added to promote crystallization. The above mixture is subjected to a hydrothermal reaction at the temperature of 160-230 DEG C to obtain bismuth ferrite Bi2Fe4O9 monocrystal nanosheets. The preparation method is advantaged by simple technological process, easy control, no pollution and low cost, and is easy for large-scale production. The prepared products have stable crystallization quality, and have wide application prospects in fields of semiconductor gas sensors, catalysts and the like.

Description

technical field [0001] The invention relates to a method for preparing bismuth ferrite single crystal nanosheets, belonging to the field of inorganic non-metallic materials. Background technique [0002] The performance of functional materials depends largely on their morphology, size and crystallinity, and the control of microscopic morphology is of great value to the application of materials. Nanomaterials have better physical and chemical properties than bulk materials, and the advancement of science and technology and the miniaturization of electronic devices have also put forward more and more requirements for the nanoscale of materials. Therefore, controlling the morphology of nanomaterials has become a hot spot of attention and research in materials science in recent years. [0003] Bismuth ferrite (Bi 2 Fe 4 o 9 ) is an important functional material, which has a good response to gases such as ethanol and acetone, and is widely used in the manufacture of semicondu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
Inventor 韩高荣杨鑫徐刚魏晓任召辉刘涌沈鸽
Owner ZHEJIANG UNIV
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