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Metal-organic frame-derived ferroferric oxide@carbon/reduced graphene oxide nano composite wave-absorbing material and preparation method thereof

A ferric tetroxide, organic framework technology, applied in chemical instruments and methods, other chemical processes, magnetic field/electric field shielding, etc., can solve the problems of narrow effective absorption bandwidth, high filling, difficult to achieve multi-frequency bands, etc., to achieve enhanced attenuation The effect of loss capacity, strong absorption and easy adjustment of wave absorption performance

Active Publication Date: 2019-07-12
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently reported magnetic metal / carbon composites derived from MOFs have high filling ratio (≥30wt%), narrow effective absorption bandwidth (<5.0GHz) and difficulty in realizing multi-band (S, C, X, Ku) synergistic absorption and other issues

Method used

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  • Metal-organic frame-derived ferroferric oxide@carbon/reduced graphene oxide nano composite wave-absorbing material and preparation method thereof
  • Metal-organic frame-derived ferroferric oxide@carbon/reduced graphene oxide nano composite wave-absorbing material and preparation method thereof
  • Metal-organic frame-derived ferroferric oxide@carbon/reduced graphene oxide nano composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Take a 150mL beaker, add 80mL N,N-dimethylformamide (DMF), weigh 20 mg of graphite oxide and add; ultrasonically disperse for 15 minutes, stir vigorously for 30 minutes, and obtain a uniform GO / DMF dispersion.

[0029] (2) Weigh 1.990g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Quickly add to the GO / DMF dispersion, stir vigorously for 10 minutes, weigh out 1.222g of terephthalic acid (H 2 BDC) Add the dispersion, mix and stir for 30min, add GO / DMF / Fe 3+ / H 2 The BDC dispersion was transferred to an autoclave lined with polytetrafluoroethylene, and reacted at 110°C for 24 hours in an electric heating blast drying oven.

[0030] (3) After the solvothermal reaction is completed, the precipitate is collected by repeated centrifugation and washing with DMF and absolute ethanol for several times, and the precipitate is collected, placed in a vacuum drying oven, and dried at 55°C for 12 hours.

[0031] (4) Carry out high-temperature pyrolysis of the dried precipitate in a tube f...

Embodiment 2

[0034] (1) Take a 150mL beaker, add 80mL N,N-dimethylformamide (DMF), weigh 40 mg of graphite oxide and add; ultrasonically disperse for 15min, stir vigorously for 30min to obtain a uniform GO / DMF dispersion.

[0035] (2) Weigh 1.990g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Quickly add to the GO / DMF dispersion, stir vigorously for 10 minutes, weigh out 1.222g of terephthalic acid (H 2 BDC) Add the dispersion, mix and stir for 30min, add GO / DMF / Fe 3+ / H 2 The BDC dispersion was transferred to an autoclave lined with polytetrafluoroethylene, and reacted at 110°C for 24 hours in an electric heating blast drying oven.

[0036] (3) After the solvothermal reaction is completed, the precipitate is collected by repeated centrifugation and washing with DMF and absolute ethanol for several times, and the precipitate is collected, placed in a vacuum drying oven, and dried at 55°C for 12 hours.

[0037] (4) Carry out high-temperature pyrolysis of the dried precipitate in a tube furnace under...

Embodiment 3

[0040] (1) Take a 150 mL beaker, add 80 mL of N,N-dimethylformamide (DMF), weigh 80 mg of graphite oxide and add; ultrasonically disperse for 15 minutes, and vigorously stir for 30 minutes to obtain a uniform GO / DMF dispersion.

[0041] (2) Weigh 1.990g ferric chloride hexahydrate (FeCl 3 ·6H 2 O) Quickly add to the GO / DMF dispersion, stir vigorously for 10 minutes, weigh out 1.222g of terephthalic acid (H 2 BDC) Add the dispersion, mix and stir for 30min, add GO / DMF / Fe 3+ / H 2 The BDC dispersion was transferred to an autoclave lined with polytetrafluoroethylene, and reacted at 110°C for 24 hours in an electric heating blast drying oven.

[0042] (3) After the solvothermal reaction is completed, the precipitate is collected by repeated centrifugation and washing with DMF and absolute ethanol for several times, and the precipitate is collected, placed in a vacuum drying oven, and dried at 55°C for 12 hours.

[0043] (4) Carry out high-temperature pyrolysis of the dried precipitate in a...

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Abstract

The invention discloses a ferroferric oxide@carbon / reduced graphene oxide nano composite wave-absorbing material and a preparation method thereof. By using graphene oxide as a template, ferric chloride hexahydrate as a metal salt, terephthalic acid as an organic ligand, and N,N-dimethylformamide as a solvent, the ferroferric oxide@carbon / reduced graphene oxide nano composite material is prepared by a solvothermal-high temperature pyrolysis two-step method. The preparation method is environmentally friendly, generates no toxic by-products, and has a simple preparation process. The prepared nanocomposite material has a good microwave absorption capacity, a wide absorption frequency band, a low thickness, light weight and a low filling ratio, can absorb electromagnetic waves in different wavelength bands by adjusting the addition amount of graphene oxide in a precursor and the thickness of a coating layer, and has an important application value in the field of electromagnetic absorptionand electromagnetic shielding.

Description

Technical field [0001] The invention belongs to the technical field of electromagnetic absorption, and in particular relates to a method for preparing a metal-organic framework derived ferroferric oxide@carbon / reduced graphene oxide nano composite wave absorbing material. Background technique [0002] With the development of electromagnetic stealth technology in the military field and the increasingly serious problems of electromagnetic interference and electromagnetic pollution, microwave absorbing materials have gradually become a research hotspot in the field of functional materials. Microwave absorbing material (abbreviated as absorbing material) refers to a type of material that can absorb and attenuate incident electromagnetic waves, and convert electromagnetic energy into heat or other forms of energy for dissipation, or make electromagnetic waves disappear due to interference. Traditional absorbing materials, such as ferrite, metal powder and silicon carbide, usually have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C09K3/00
CPCC09K3/00H05K9/0081
Inventor 疏瑞文李为杰吴越张佳宾张耕源
Owner ANHUI UNIV OF SCI & TECH
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