Polypyrrole-coated ferroferric oxide nanoflower wave-absorbing material as well as preparation method and application thereof

A technology of ferroferric oxide and wave-absorbing materials, which is applied in the field of wave-absorbing materials, can solve problems such as the lack of synergistic effect of wave-absorbing agents, multiple loss mechanisms, and difficulty in meeting reflection loss capabilities, so as to promote multiple reflections and scattering, and prolong electromagnetic waves. The transmission path and dielectric loss are significantly enhanced by the effect of capability

Pending Publication Date: 2022-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of synergistic effects and multiple loss mechanisms of single-component absorbers, it is difficult to meet performance requirements such as strong reflection loss capability, wide enough response frequency band, light density, and thin thickness.
[0003] In recent years, researchers have designed and synthesized composite electromagnetic wave absorbing materials with multi-component hierarchical structure, see the non-patent literature Porous Three-Dimensional Flower-like Co / CoO and Its Excellent Electromagnetic Absorption Properties, which discloses the assembly of ultrathin nanosheets into The 3D porous flower-like Co / CoO has achieved the strongest reflection loss value of -50dB, which is due to the suppression of the eddy current effect by the ultra-thin nanosheets. The special flower-like structure is conducive to multiple reflections and dissipation of electromagnetic energy, improving the electromagnetic wave Loss capability, but the bandwidth needs to be further improved

Method used

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  • Polypyrrole-coated ferroferric oxide nanoflower wave-absorbing material as well as preparation method and application thereof
  • Polypyrrole-coated ferroferric oxide nanoflower wave-absorbing material as well as preparation method and application thereof
  • Polypyrrole-coated ferroferric oxide nanoflower wave-absorbing material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0038] The invention provides a preparation method of a polypyrrole-coated iron ferric oxide nano flower absorbing material, comprising: S1: dissolving an inorganic ferric salt in an organic alcohol solvent, adding an alkaline substance to obtain a mixed solution, and dissolving The mixed solution is heated to 160-200 DEG C and kept warm for 2-6 hours to obtain a precursor with a hierarchical nanoflower structure; the precursor is ferric alkoxide.

[0039] S2: Calcining the precursor to obtain ferric iron tetroxide with a hierarchical nanoflower structure.

[0040] S3: Disperse the ferric oxide in deionized water, add pyrrole, and then add an oxidizing agent, so that the free radicals of the pyrrole cations are coupled and polymerized along the surface of the ultrathin sheet to obtain polypyrrole-coated ferric oxide nano-flowers wave material.

[0041] The principle of the above-mentioned preparation process is as follows:

[0042] Organic alcohols and iron ions are chelated t...

Embodiment 1

[0045] This embodiment includes the following preparation steps:

[0046] (1) Use anhydrous ferric chloride (FeCl 3 ) as a raw material, the precipitating agent is urea, and ethylene glycol is used as a solvent. The molar ratio of the above-mentioned anhydrous ferric chloride and urea is 1:8, and ultrasonically dissolve in 40mL of ethylene glycol for 40 minutes. Subsequently, the yellow solution was quickly transferred to a polytetrafluoroethylene-lined reactor with a volume of 100ml, and the program was set to raise the temperature to 200°C at a rate of 5°C / min for 4 hours. After the reaction program was completed, it was naturally cooled to room temperature. . The precipitate was collected by high-speed centrifugation, and washed three times with absolute ethanol and deionized water respectively, at a rotation speed of 12000 rpm, for four minutes each time. The centrifuged pellet was lyophilized for 12 hours.

[0047] (2) The precipitate obtained by freeze-drying was pas...

Embodiment 2-7

[0054] Examples 2-7 were prepared in the same manner as Example 1, see Table 1 for the differences.

[0055] The preparation process parameter table of table 1 embodiment 2-7

[0056]

[0057]

[0058] All of the above examples can obtain the polypyrrole-coated ferric oxide nanoflower absorbing material, and all exhibit good electromagnetic wave absorbing effects. Specifically, the electromagnetic wave absorption performance results are shown in Table 2 below:

[0059] The electromagnetic wave absorption performance of table 2 embodiment 2-7

[0060] Thickness (mm) Frequency range of reflectivity RL≤-10dB (GHz) Example 2 2mm 14(GHz)-17(GHz) Example 3 2.3mm 13.2(GHz)-16.7(GHz) Example 4 1.75mm 13.7(GHz)-18(GHz) Example 5 2mm 15.6(GHz)-18(GHz) Example 6 5mm 4.8(GHz)-7.2(GHz) Example 7 1.75mm 12.9(GHz)-18(GHz)

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Abstract

The invention discloses a polypyrrole coated ferroferric oxide nanoflower wave-absorbing material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving an inorganic trivalent iron salt in an organic alcohol solvent, adding an alkaline substance to obtain a mixed solution, heating the mixed solution to 160-200 DEG C, and keeping the temperature for 2-6 hours to obtain a precursor with a hierarchical nanoflower structure; the precursor is subjected to calcination treatment, and ferroferric oxide with a hierarchical nanoflower structure is obtained; the ferroferric oxide is dispersed in deionized water, pyrrole is added, then an oxidizing agent is added, pyrrole cation free radicals are subjected to coupling polymerization along the surface of the ultrathin sheet, and the polypyrrole-coated ferroferric oxide nanoflower wave-absorbing material is obtained. The ferroferric oxide with the hierarchical nanoflower structure is coated with the in-situ polymerized polypyrrole, impedance matching is improved, more incident electromagnetic waves are captured, multiple reflection and scattering of the electromagnetic waves in the composite material are promoted, the transmission path of the electromagnetic waves is prolonged, and the loss capacity of the electromagnetic waves is enhanced.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and more specifically relates to a polypyrrole-coated ferric oxide nano-flower wave-absorbing material, a preparation method and an application. Background technique [0002] Since 2020, the explosive application of 5G technology has brought a subversive experience to human life. At the same time, severe electromagnetic radiation will not only interfere with the normal operation of digital devices and information security, but also endanger human health, causing Endocrine disorders, cancer and other major diseases. Electromagnetic wave absorbing materials can convert harmful radiated electromagnetic waves into heat energy and other forms of energy through energy dissipation, so it is imminent to develop advanced high-performance microwave absorbing materials. When designing electromagnetic wave absorbers, in addition to considering the inherent physical, chemical and electromagn...

Claims

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Application Information

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IPC IPC(8): C01G49/08C08G73/06
Inventor 闫云君田小可许小玲薄广旭李凯
Owner HUAZHONG UNIV OF SCI & TECH
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