Preparation method for graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material

A composite wave absorbing material, three-dimensional flower-like technology, applied in the field of material science, can solve the problem of little research, and achieve the effects of good crystallinity, low energy consumption and excellent performance

Inactive Publication Date: 2018-04-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous materials have a large specific surface area, a large number of internal contact points and a large number of grain boundaries, all of which will help the absorption of incident electromagnetic waves. The lightweight of porous materials is also a prerequisite for excellent wave-absorbing materials in the future. There are very few studies on porous structure materials and RGO composites

Method used

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  • Preparation method for graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material
  • Preparation method for graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material
  • Preparation method for graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material

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preparation example Construction

[0033] The preparation steps of the medium-thick flaky bismuth ferrite powder of the present invention comprise:

[0034] (a) Take Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O and dilute nitric acid are mixed and then magnetically stirred to fully dissolve to obtain a mixed solution B; among them, Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 The ratio of O and dilute nitric acid is 1mmol: 2mmol: (12-15)mL;

[0035] (b) Slowly add NaOH solution dropwise to the mixed solution B, and stir to obtain a reddish-brown suspension C;

[0036] (c) Pour the suspension C into the reaction kettle and seal it, carry out a homogeneous hydrothermal reaction, and generate a precipitate;

[0037] (d) After the reaction kettle is cooled to room temperature, the precipitate obtained by the homogeneous hydrothermal reaction is washed and dried to obtain thick flake bismuth ferrite powder.

[0038] The mass fraction of nitric acid in the step (a) is 65%; the concentration of the NaOH solution in t...

Embodiment 1

[0044] A preparation method of graphene / three-dimensional flower-shaped bismuth ferrite composite absorbing material, comprising the following steps:

[0045] 1) According to Bi 2 Fe 4 o 9 Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, dissolved in 15mL of dilute nitric acid with a volume fraction of 5vol% and magnetically stirred to fully dissolve to obtain mixed solution A; Bi(NO 3 ) 3 ·5H 2 The ratio of O to dilute nitric acid is 1mmol: 12mL;

[0046] 2) Add 45 mL of 12 mol / L NaOH solution dropwise at a rate of two drops per second to the mixture A, and stir to precipitate Bi 3+ and Fe 3+ , to obtain a reddish-brown suspension B;

[0047] 3) Pour the suspension B into a polytetrafluoroethylene reactor, place it in a homogeneous reactor and seal it, and perform a homogeneous hydrothermal reaction. The reaction conditions for the homogeneous reaction: the reaction temperature is controlled at 190°C, and the reaction time is controlled at 6h;

[0048] 4) After the rea...

Embodiment 2

[0061] A preparation method of graphene / three-dimensional flower-shaped bismuth ferrite composite absorbing material, comprising the following steps:

[0062] 1) According to Bi 2 Fe 4 o 9 Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O, dissolved in 15mL of dilute nitric acid with a volume fraction of 7vol% and magnetically stirred to make it fully dissolved to obtain mixed solution A; Bi(NO 3 ) 3 ·5H 2 The ratio of O to dilute nitric acid is 1mmol: 12mL;

[0063] 2) Add 45 mL of 10 mol / L NaOH solution dropwise at a rate of two drops per second to the mixture A to precipitate Bi 3+ and Fe 3+ , stirring to obtain a reddish-brown suspension B;

[0064] 3) Pour the suspension B into a polytetrafluoroethylene reactor, place it in a homogeneous reactor and seal it, and perform a homogeneous hydrothermal reaction. The reaction conditions for the homogeneous reaction: the reaction temperature is controlled at 180°C, and the reaction time is controlled at 12h;

[0065] 4) Afte...

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Abstract

The invention discloses a preparation method for a graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material, and the method comprises the steps: mixing bismuth ferrite powder and oxidized graphene in corrosion solvent at the mass ratio of 25: (3-6), and obtaining mixed liquor A after supersonic processing; carrying out the heating and stirring of the mixed liquor A atthe protective atmosphere, adding a reducing agent and a complexing agent to the mixed liquor A in a dripping manner, carrying out the corrosion reaction for 40-50 min after dripping, and obtaining the three-dimensional flower-shaped bismuth ferrite powder through cooling. The method provided by the invention is novel, is uniform in particles, is low in requirements for the equipment operation, issimple in technology, is low in energy consumption, can achieve the continuous operation, and enables the process conditions to be controlled easily. Compared with a single phase, the composite material greatly improves the electromagnetic wave absorbing performances.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a preparation method of a graphene / three-dimensional flower-shaped bismuth ferrite composite wave-absorbing material. Background technique [0002] Since the electromagnetic pollution caused by the radiation of various electronic devices and communication technologies has become an environmental problem that cannot be ignored, potentially endangering life systems, information security and electromagnetic compatibility, high-efficiency electromagnetic wave shielding materials used in different fields are increasingly becoming The focus of national research. An ideal electromagnetic shielding material should have the characteristics of light thickness, light weight, wide bandwidth, and strong absorption capacity in a wide frequency range. Electromagnetic wave shielding performance is mainly characterized by reflection coefficient, and the design principles of electromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C09K3/00
CPCH05K9/0081C09K3/00
Inventor 杨海波戴菁菁文博林营王雷
Owner SHAANXI UNIV OF SCI & TECH
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