Preparation and excellent electromagnetic absorption properties of dendritic structured Fe3O4@PANI composites

Luo, Xiang; Li, Haifeng; Deng, Dongdong; Zheng, Lu; Yu-bo, WU; Luo, Wei; Zhang, Mei‐Jie; Gong, Rongzhou

doi:10.1016/j.jallcom.2021.161922

Cited by 29 publications

(23 citation statements)

References 71 publications

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“…Figure 2 b shows a distinct absorption peak located at 582 cm −1 in the patterns, which could be attributed to the vibration of the Fe−O group that was obtained from the NdFe 2 O 4 crystal structure [ 33 ]. Furthermore, the common peaks at 1046 and 1627 cm −1 corresponded to the hierarchical ether group (−C−O−C−) and carbonyl group (C=O), respectively [ 34 ]. However, the carbonyl group peaks among the three samples were similar because of the oxidation of hydroxy from PEG in the reducing reaction of partial Fe 3+ to Fe 2+ [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Song

Yao

et al. 2023

Molecules

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Magnetic protective fabrics with fine wearability and great protective properties are highly desirable for aerospace, national defense, and wearable protective applications. The study of the controllable preparation method of Nd3+ doped in Fe3O4 nanoparticles with supposed magnetic properties remains a challenge. The characterization of the microstructure, elemental composition, and magnetic properties of NdFe2O4 nanoparticles was verified. Then, the surface of NdFe2O4 was treated with glyceric acid to provide sufficient –OH. Subsequently, the connection of the nanoparticle by the succinimide group was studied and then grafted onto cotton fabrics as its bridging effect. The optimal loading rate of the functional fabrics with nanoparticles of an average size of 230 nm was 1.37% after a 25% alkali pretreatment. The color fatness to rubbing results showed better stability after washing and drying. The corresponding hysteresis loop indicated that the functional fabrics exhibited typical magnetism behavior with a closed “S” shape and a magnetic saturation value of 17.61 emu.g−1 with a particle size of 230 nm. However, the magnetic saturation value of the cotton fabric of 90 nm was just 4.89 emu.g−1, exhibiting controllable preparation for the aimed electromagnetic properties and great potential in radiation protective fields. The electrochemical properties of the functional fabrics exhibited extremely weak electrical conductivity caused by the movement of the magnetic dipole derived from the NdFe2O4 nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Song

Yao

et al. 2023

Molecules

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“…The polarization process can be studied on the basis of the Cole− Cole curve. The relationship between ε′ and ε″ is as follows 8,9,50…”

Section: Hexagonal Flakementioning

confidence: 99%

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Chen,

Chen

et al. 2023

Inorg. Chem.

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Combining magnetic and dielectric materials to form a composite can significantly improve its impedance matching and electromagnetic wave absorption performance. Furthermore, composite materials with a core−shell structure hold promise in meeting the demand for lightweight and highly electromagneticabsorbing properties. In this study, uniform hexagonal flake barium ferrite (BaFe 12 O 19 ) was prepared using the hydrothermal method. Subsequently, BaFe 12 O 19 @PVDF composites were synthesized by the sol−gel method. By adjusting the mass ratio of BaFe 12 O 19 and PVDF, the shell size of the BaFe 12 O 19 @PVDF composite material was controlled, and its electromagnetic absorption performance was enhanced. The shell thickness of BaFe 12 O 19 @PVDF is 19.64 nm when the BaFe 12 O 19 : PVDF mass ratio is 1:1.0, and the optimal impedance matching is obtained at 13.4 GHz. Meanwhile, at a thickness of 1.5 mm, the minimum reflection loss (RL min ) reached −58.04 dB, and an effective absorption bandwidth (EAB) (RL ≤ −10 dB) of 5.53 GHz was achieved within the frequency range of 11.65 to 15.63 GHz and from 16.36 to 17.91 GHz. Besides, the composites with a matching thickness of 3.5 mm show a maximum EAB of 15.90 GHz when the mass ratio of BaFe 12 O 19 to PVDF is 1:1.2. Within the frequency range of 2−18 GHz, the coverage of reflection loss less than −10 dB is 99.38%, almost achieving full coverage. These results demonstrate that BaFe 12 O 19 @PVDF composites exhibit excellent electromagnetic-absorbing performances, making them an excellent candidate for electromagnetic wave absorption in 5G communications.

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“…PANI can optimize impedance matching and form conductive networks to optimize the absorbing performance. When the matching thickness is 1.3 mm, the RLmin value of −53.08 dB is obtained at 3.04 GHz, and it has a wide EAB (4.1 GHz) [102]. Figure 13f provides the absorbing mechanism of dendritic Fe3O4@PANI composite material, which is mainly divided into three aspects: dielectric loss, magnetic loss, and good conductive network.…”

Section: Conductive Polymer-coated Fementioning

confidence: 99%

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

et al. 2022

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With the rapid development of communication technology in civil and military fields, the problem of electromagnetic radiation pollution caused by the electromagnetic wave becomes particularly prominent and brings great harm. It is urgent to explore efficient electromagnetic wave absorption materials to solve the problem of electromagnetic radiation pollution. Therefore, various absorbing materials have developed rapidly. Among them, iron (Fe) magnetic absorbent particle material with superior magnetic properties, high Snoek’s cut-off frequency, saturation magnetization and Curie temperature, which shows excellent electromagnetic wave loss ability, are kinds of promising absorbing material. However, ferromagnetic particles have the disadvantages of poor impedance matching, easy oxidation, high density, and strong skin effect. In general, the two strategies of morphological structure design and multi-component material composite are utilized to improve the microwave absorption performance of Fe-based magnetic absorbent. Therefore, Fe-based microwave absorbing materials have been widely studied in microwave absorption. In this review, through the summary of the reports on Fe-based electromagnetic absorbing materials in recent years, the research progress of Fe-based absorbing materials is reviewed, and the preparation methods, absorbing properties and absorbing mechanisms of iron-based absorbing materials are discussed in detail from the aspects of different morphologies of Fe and Fe-based composite absorbers. Meanwhile, the future development direction of Fe-based absorbing materials is also prospected, providing a reference for the research and development of efficient electromagnetic wave absorbing materials with strong absorption performance, frequency bandwidth, light weight and thin thickness.

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Preparation and excellent electromagnetic absorption properties of dendritic structured Fe3O4@PANI composites

Cited by 29 publications

References 71 publications

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

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Preparation and excellent electromagnetic absorption properties of dendritic structured Fe3O4@PANI composites

Cited by 29 publications

References 71 publications

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Study on the Controllable Preparation of Nd3+ Doped in Fe3O4 Nanoparticles for Magnetic Protective Fabrics

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe12O19@PVDF Composites

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

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Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe₁₂O₁₉@PVDF Composites