Preparation method for bismuth ferrite BiFeO3 nanosheet

A technology of nanosheets and bismuth ferrite, which is applied in chemical instruments and methods, iron compounds, sustainable manufacturing/processing, etc., can solve the problem of high energy consumption, and achieve the effects of simple equipment, energy saving, and intact crystallization

Active Publication Date: 2015-12-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent application with the publication number CN101311369A discloses a method for preparing pure-phase bismuth ferrite microcrystals by rapid cooling hydrothermal reaction, but the preparation temperature is as high as 200°C and the energy consumption is high

Method used

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  • Preparation method for bismuth ferrite BiFeO3 nanosheet
  • Preparation method for bismuth ferrite BiFeO3 nanosheet
  • Preparation method for bismuth ferrite BiFeO3 nanosheet

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Embodiment 1

[0035] Such as figure 1 As shown, the BiFeO of this example 3 The preparation process includes the following steps:

[0036] Weigh 2mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 2mmolBi(NO 3 ) 3 ·5H 2 O, and stir and dissolve it in 20ml of ethylene glycol methyl ether solution, and stir it magnetically for 0.5h to form a uniform solution A; while stirring magnetically, mix 5ml of 8mol / L ammonia solution at 5mL / min The titration rate was added dropwise to solution A, and magnetically stirred for 0.5h to obtain a hydrothermal reaction precursor; the hydrothermal reaction precursor was centrifugally washed with deionized water to neutrality, and dried at 80°C to obtain a dry powder; the dry powder and concentration 4mol / L NaOH aqueous solution (as a mineralizer) is put into a hydrothermal reaction kettle with a filling degree of 80%; the reaction kettle is sealed, and the reaction kettle is placed in an oven at 140°C, and the product in the reaction kettle is taken out ...

Embodiment 2

[0040] Weigh 1mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 1mmolBi(NO 3 ) 3 ·5H 2 O, and ultrasonically dissolve it in 10ml of ethylene glycol methyl ether solution, and ultrasonically dissolve it for 0.5h to form a uniform solution A; while stirring magnetically, dissolve 5ml of 7mol / L ammonia solution at Add dropwise to solution A at a titration rate, and stir magnetically for 0.5h to obtain a hydrothermal reaction precursor; wash the hydrothermal reaction precursor to neutrality and dry at 85°C to obtain a dry powder; mix the dry powder with NaOH with a concentration of 2mol / L The aqueous solution (as a mineralizer) is put into a hydrothermal reaction kettle with a filling degree of 90%; the reaction kettle is sealed, and the reaction kettle is placed in an oven at 120°C. Dry in an oven at ℃ to get bismuth ferrite BiFeO 3 Nanosheets. The pure phase bismuth ferrite BiFeO prepared in this embodiment 3 The nanosheets crystallize well, and the size is between 100nm ...

Embodiment 3

[0044] Weigh 3mmol of analytically pure Fe(NO 3 ) 3 9H 2 O and 3mmolBi(NO 3 ) 3 ·5H 2 O, and dissolve it in 20ml of ethylene glycol methyl ether solution, and stir it magnetically for 0.5h to form a uniform solution A; while stirring magnetically, mix 5ml of 9mol / L ammonia solution at 3mL / min Add dropwise to solution A at a titration rate, and stir magnetically for 0.5h to obtain a hydrothermal reaction precursor; wash the hydrothermal reaction precursor to neutrality, and dry it at 90°C to obtain a dry powder; dissolve NaOH in absolute ethanol with a ratio of In the mixed solution of 0.5% water and absolute ethanol, it is configured into a 3mol / L NaOH solution; then the dry powder and the NaOH solution (as a mineralizer) with a concentration of 3mol / L are put into the hydrothermal reaction kettle, and the filling degree is 70%; seal the reactor, place the reactor in an oven at 130°C, take out the product in the reactor after reacting for 16 hours, wash and dry in an oven...

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Abstract

The invention discloses a preparation method for a bismuth ferrite BiFeO3 nanosheet. The preparation method comprises the following steps: weighing analytically pure Fe(NO3)3.9H2O and Bi(NO3)3.5H2O in a molar ratio of 1: 1 and dissolving the mixture in a ethylene glycol monomethyl ether solution to prepare a uniform solution A; dropwise adding an ammonia water solution into the solution A while stirring, wherein the mixture is fully settled, and uniformly stirring the mixture to prepare a reaction precursor; washing the prepared reaction precursor to neutral, and drying the reaction precursor to obtain dry powder; putting the dry powder and a NaOH solution into a reaction kettle, and sealing the reaction kettle; putting the reaction kettle in a reaction furnace at 120-150 DEG C, taking out a product in the reaction kettle after reaction, and washing and drying the product to obtain the bismuth ferrite BiFeO3 nanosheet. The preparation method disclosed by the invention is low in preparation temperature and energy-saving, and bismuth ferrite BiFeO3 is intact in crystallization and simple in instrument and equipment required by process control and synthesis.

Description

technical field [0001] The present invention relates to bismuth ferrite BiFeO 3 The preparation method of, particularly a kind of bismuth ferrite BiFeO 3 Preparation methods of nanosheets. Background technique [0002] Due to their simultaneous ferroelectricity, ferromagnetism or ferroelasticity, multiferroic materials have broad application prospects in information storage devices, spintronic devices and sensors. Among many multiferroic materials, BiFeO 3 In particular, it is one of the few single-phase multiferroic materials found to have both ferroelectric order and antiferromagnetic order at room temperature. Its Curie temperature and Neel temperature are relatively high, respectively 1103K and 643K, which have been extensively studied in recent years. However, the excessive leakage current due to the presence of impurity phases seriously hinders the BiFeO 3 application of materials. [0003] So far BiFeO 3 There are many synthetic methods, mainly high-temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/00C01P2002/72C01P2004/04C01P2004/24Y02P20/10
Inventor 陈志武金无量卢振亚钟财富
Owner SOUTH CHINA UNIV OF TECH
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