Low temperature condition preparation of orientated growth nanometer flaky Bi2Fe4O9

A technology of bi2fe4o9 and nano flakes, which is applied in the field of preparation of directional growth nano flakes Bi2Fe4O9 by hydrothermal method, can solve the problem of harsh experimental environment, no material crystal structure preferred growth, solid state reaction uniformity and controllability can not be matched Compared with hydrothermal reaction and other problems, it achieves the effect of good feasibility and controllability

Active Publication Date: 2008-12-10
山东产研陶瓷研究院有限公司
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Problems solved by technology

Now prepare Bi 2 Fe 4 o 9 The report of the reaction is still rare, and most of them are prepared by solid-state reaction, and the solid-state reaction can not be compared with the hydrothermal reaction in terms of reaction uniformity and controllability[7-8]
Some Bi prepared by hydrothermal method 2 Fe 4 o 9 The experimental environment is relatively harsh, and the highly directional growth of Bi cannot be obtained. 2 Fe 4 o 9 , in 2006, Han Jiantao of Fudan University and others successfully prepared phase-pure nano-block Bi by hydrothermal method at 270 °C. 2 Fe 4 o 9 , but there is no tendency for the crystal structure of the material to grow preferentially along certain planes[9], using a hydrothermal method to prepare highly oriented Bi 2 Fe 4 o 9 The material has not yet been reported

Method used

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  • Low temperature condition preparation of orientated growth nanometer flaky Bi2Fe4O9
  • Low temperature condition preparation of orientated growth nanometer flaky Bi2Fe4O9
  • Low temperature condition preparation of orientated growth nanometer flaky Bi2Fe4O9

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Embodiment 1

[0035] Bi(NO 3 ) 3 ·5H 2 O 1.94 g (4 mmol) and Fe(NO 3 ) 3 9H 2 O 1.616 grams (4 millimoles) are dissolved in the dilute nitric acid of 0.1 equivalent concentration, then titrate with the NaOH aqueous solution of 12 mol / liter to precipitation completely, wash with suction filtration water until the solution is neutral, also wash away wherein Na + and NO 3 - . The obtained precipitate was dissolved in a NaOH aqueous solution with a concentration of 8 mol / liter to form a 40 ml solution, wherein Bi(NO 3 ) 3 ·5H 2 The concentration of O is 100 mmol / L, Fe(NO 3 ) 3 9H 2 The concentration of O is 100 mmol / L, add 2 mL of H 2 o 2 , quickly poured into a 50 ml reaction kettle, put it in a 160°C oven for 72 hours, took it out, washed it twice with deionized water and once with alcohol, put it in a 60°C oven for 4 hours, and the final product was highly directional growth Nanosheet Bi 2 Fe 4 o 9 .

Embodiment 2

[0037] Bi(NO 3 ) 3 ·5H 2 O 970 mg (2 mmol) and Fe (NO 3 ) 3 9H 2 O 808 milligrams (2 millimoles) are dissolved in the dilute nitric acid of 0.1 equivalent concentration, then titrate with 12 mol / L NaOH aqueous solution until the precipitation is complete, wash with suction filtration until the solution is neutral, and also wash off the Na therein + and NO 3 - . The obtained precipitate was dissolved in an aqueous NaOH solution with a concentration of 20 mol / liter to form a 40 ml solution, wherein Bi(NO 3 ) 3 ·5H 2 The concentration of O is 50 mmol / L, Fe(NO 3 ) 3 9H 2 The concentration of O is 50 mmol / L, add 2 mL of H 2 o 2 , quickly poured into a 50 ml reaction kettle, put it in a 200°C oven for 50 hours, took it out, washed it twice with deionized water and once with alcohol, put it in a 100°C oven for 2 hours, and the final product was highly directional growth Nanosheet Bi 2 Fe 4 o 9 .

Embodiment 3

[0039] Bi(NO 3 ) 3 ·5H 2 O 232.8 mg (0.48 mmol) and Fe (NO 3 ) 3 9H 2 O 193.9 mg (0.48 mmol) was dissolved in dilute nitric acid of 0.1 normal concentration, then titrated with 12 mol / liter of NaOH aqueous solution until the precipitation was complete, and washed with suction and filtered water until the solution was neutral, and the Na therein was also washed away + and NO 3 - . The precipitate obtained is dissolved in a NaOH aqueous solution with a concentration of 12 mol / liter to form a 40 ml solution, wherein Bi(NO 3 ) 3 ·5H 2 The concentration of O is 12 mmol / L, Fe(NO 3 ) 3 9H 2 The concentration of O is 12 mmol / L, add 2 mL of H 2 o 2 , quickly poured into a 50 ml reaction kettle, put it in an oven at 180°C for 50 hours, took it out, washed it twice with deionized water and once with alcohol, put it in an oven at 80°C for 4 hours, and the final product was highly directional growth Nanosheet Bi 2 Fe 4 o 9 .

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Abstract

The invention discloses a method for synthesizing a highly directional nano flake Bi2Fe4O9 crystal at a low temperature. The method mainly adopts the hydrothermal preparation method and comprises the following steps that: Bi(NO3)3.5H2O and Fe(NO3)3.9H2O with the same mol ration are dissolved in a dilute nitric acid, a sodium hydrate aqueous solution is titrated into the mixed solution until the precipitation is complete, and the mixture is filtered and washed by water until the solution is neutral. The method is characterized in that the obtained precipitation is dissolved in a sodium hydrate aqueous solution with a concentration of between 8 and 20 mol per liter, 2 milliliters of H2O2 solution against 40 milliliters of the H2O2 solution are added, the mixture is put in a reaction kettle and reacts for 12 to 72 hours at a temperature of between 160 and 200 DEG C, the product is washed by de-ionized water and alcohol and is dried in an oven, and the obtained final product is the directionally growing nano flake Bi2Fe4O9.

Description

technical field [0001] The invention relates to a method for preparing highly oriented growth nanosheet Bi 2 Fe 4 o 9 method, especially related to the preparation of oriented nanosheet-like Bi by hydrothermal method under low temperature conditions 2 Fe 4 o 9 Methods. It belongs to the category of nanometer ferroelectric technology. Background technique [0002] Many excellent properties of modern functional materials are closely related to their own morphology, microstructure, size, and crystal structure. The control of microscopic morphology is not only useful for the basic research of materials, but also has great value for the application of materials [1-4]. Bi 2 Fe 4 o 9 It can be used in semiconductor devices, it is a very important semiconductor gas sensor material, and it is also a good catalyst for the preparation of NO by ammonia oxidation [5-6]. Highly oriented Bi 2 Fe 4 o 9 The material has many other properties, such as excellent magnetic properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/64C30B7/10C04B35/26
Inventor 孙华君陈文周静李波徐庆朱泉峣张成勇沈杰
Owner 山东产研陶瓷研究院有限公司
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