Electromagnetic and Microwave Absorption Properties of Magnetic Nanomaterials and Superstructure

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: 20 March 2024 | Viewed by 9093

Special Issue Editors

Micro-Electronics Research Institute, Hangzhou Dianzi University, Hangzhou 310018, China
Interests: magnetic materials; high-intensity magnetic field; Fe, Co, Ni-based materials; magnetic metal oxide; magnetic phase change material; microwave absorption
School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China
Interests: functionnal fiber; nanomaterials; TMDs; COFs; polymer; electromagnetic wave absorption

Special Issue Information

Dear Colleagues,

Electromagnetic interference (EMI) problems have recently become extremely serious due to the accelerated development of wireless communication tools and electronic systems. These problems threaten the health of human beings, cause information leakage, and impede the functionality of electronic devices. The electromagnetic (EM) wave absorbers can avoid or attenuate the hazards of EMI by effectively absorbing EM waves. The EM absorption (EMA) properties of absorbers are determined by many crucial factors, such as compound composition, morphology and microstructure. Hence, various microwave absorbents with different compositions and structures have been obtained from flakes, porous, core–shells, and superstructures. Among these absorbents, the magnetic loss materials and superstructures are effective in EMA. Given their high magnetic anisotropy, shape anisotropy, complex interface, and large specific surface, magnetic loss materials and superstructures enhance the diffuse scattering of the incident microwave and polarization of interface charges. Hence, magnetic loss and superstructural materials have received great interest from researchers in EMA areas.

We are pleased to invite you to contribute to the Special Issue of Nanomaterials entitled “Electromagnetic and Microwave Absorption Properties of Magnetic Nanomaterials and Superstructure”, which is in line with the development direction of Nanomaterials and can make contributions to the development and influence of the journal.

This Special Issue aims to include the magnetic materials and superstructure applied for microwave absorption.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but is not limited to) the following:

  • Design of magnetic-based composites, superstructure and their microwave absorption, concerning not only the fabrication processes, the materials employed (Fe, Co, Ni-based materials, magnetic metal oxide, Magnetic phase change material, etc.);
  • Special design of structures (1D, 2D, 3D structures, porous structures, core/yolk-shell structures, hollow structures, 3D printing structure, etc.) but especially reports of their practical application in microwave absorption.

We look forward to receiving your contributions.

Dr. Xiaohui Liang
Dr. Zengming Man
Guest Editors

Manuscript Submission Information

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Keywords

  • magnetic materials
  • Fe, Co, Ni-based materials
  • magnetic metal oxide
  • magnetic phase change material
  • microwave absorption
  • superstructure

Published Papers (5 papers)

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Research

12 pages, 7642 KiB  
Article
Co3O4 Nanoparticle-Modified Porous Carbons with High Microwave Absorption Performances
Nanomaterials 2023, 13(6), 1073; https://doi.org/10.3390/nano13061073 - 16 Mar 2023
Cited by 2 | Viewed by 1116
Abstract
Carbon materials derived from natural biomaterials have received increasing attention because of their low cost, accessibility, and renewability. In this work, porous carbon (DPC) material prepared from D-fructose was used to make a DPC/Co3O4 composite microwave absorbing material. Their electromagnetic [...] Read more.
Carbon materials derived from natural biomaterials have received increasing attention because of their low cost, accessibility, and renewability. In this work, porous carbon (DPC) material prepared from D-fructose was used to make a DPC/Co3O4 composite microwave absorbing material. Their electromagnetic wave absorption properties were thoroughly investigated. The results show that the composition of Co3O4 nanoparticles with DPC had enhanced microwave absorption (−60 dB to −63.7 dB), reduced the frequency of the maximum reflection loss (RL) (16.9 GHz to 9.2 GHz), and had high reflection loss over a wide range of coating thicknesses (2.78–4.84 mm, highest reflection loss <−30 dB). This work provided a way for further research on the development of biomass-derived carbon as a sustainable, lightweight, high-performance microwave absorber for practical applications. Full article
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14 pages, 4518 KiB  
Article
Tunable Electromagnetic and Microwave Absorption Properties of Magnetic FeNi3 Alloys
Nanomaterials 2023, 13(5), 930; https://doi.org/10.3390/nano13050930 - 03 Mar 2023
Cited by 6 | Viewed by 1207
Abstract
Magnetic materials have a very broad application prospect in the field of microwave absorption, among which soft magnetic materials become the focus of magnetic materials research because of their high saturation magnetization and low coercivity. FeNi3 alloy has been widely used in [...] Read more.
Magnetic materials have a very broad application prospect in the field of microwave absorption, among which soft magnetic materials become the focus of magnetic materials research because of their high saturation magnetization and low coercivity. FeNi3 alloy has been widely used in soft magnetic materials because of its excellent ferromagnetism and electrical conductivity. In this work, FeNi3 alloy was prepared by the liquid reduction method. The effect of the filling ratio of FeNi3 alloy on the electromagnetic properties of absorbing materials was studied. It is found that the impedance matching ability of FeNi3 alloy is better when the filling ratio is 70 wt% than that of other samples with different filling ratios (30–60 wt%), showing better microwave absorption characteristics. When the matching thickness is 2.35 mm, the minimum reflection loss (RL) of FeNi3 alloy with a 70 wt% filling ratio reaches −40.33 dB, and the effective absorption bandwidth is 5.5 GHz. When the matching thickness is between 2 and 3 mm, the effective absorption bandwidth ranges from 7.21 GHz to 17.81 GHz, almost covering the whole X and Ku bands (8–18 GHz). The results show that FeNi3 alloy has adjustable electromagnetic properties and microwave absorption properties with different filling ratios, which is conducive to selecting excellent microwave absorption materials. Full article
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15 pages, 7121 KiB  
Article
A Sustainable and Low-Cost Route to Design NiFe2O4 Nanoparticles/Biomass-Based Carbon Fibers with Broadband Microwave Absorption
Nanomaterials 2022, 12(22), 4063; https://doi.org/10.3390/nano12224063 - 18 Nov 2022
Cited by 5 | Viewed by 1350
Abstract
Carbon-based microwave-absorbing materials with a low cost, simple preparation process, and excellent microwave absorption performance have important application value. In this paper, biomass-based carbon fibers were prepared using cotton fiber, hemp fiber, and bamboo fiber as carbon sources. Then, the precise loading of [...] Read more.
Carbon-based microwave-absorbing materials with a low cost, simple preparation process, and excellent microwave absorption performance have important application value. In this paper, biomass-based carbon fibers were prepared using cotton fiber, hemp fiber, and bamboo fiber as carbon sources. Then, the precise loading of NiFe2O4 nanoparticles on biomass-based carbon fibers with the loading amount in a wide range was successfully realized through a sustainable and low-cost route. The effects of the composition and structure of NiFe2O4/biomass-based carbon fibers on electromagnetic parameters and electromagnetic absorption properties were systematically studied. The results show that the impedance matching is optimized, and the microwave absorption performance is improved after loading NiFe2O4 nanoparticles on biomass-based carbon fibers. In particular, when the weight percentage of NiFe2O4 nanoparticles in NiFe2O4/carbonized cotton fibers is 42.3%, the effective bandwidth of NiFe2O4/carbonized cotton fibers can reach 6.5 GHz with a minimum reflection loss of −45.3 dB. The enhancement of microwave absorption performance is mainly attributed to the appropriate electromagnetic parameters with the ε’ ranging from 9.2 to 4.8, and the balance of impedance matching and electromagnetic loss. Given the simple synthesis method, low cost, high output, and excellent microwave absorption performance, the NiFe2O4/biomass-based carbon fibers have broad application prospects as an economic and broadband microwave absorbent. Full article
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13 pages, 3935 KiB  
Article
Lightweight Chain-Typed Magnetic Fe3O4@rGO Composites with Enhanced Microwave-Absorption Properties
Nanomaterials 2022, 12(20), 3699; https://doi.org/10.3390/nano12203699 - 21 Oct 2022
Cited by 6 | Viewed by 3152
Abstract
A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe3O4 and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of [...] Read more.
A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe3O4 and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of Fe3O4 and rGO was produced by a hydrothermal method under an applied magnetic field. The electromagnetic loss property of the Fe3O4@rGO composites is studied in the frequency range from 2 to 18 GHz. In addition, the reflection loss and the mechanism of microwave absorption are explored. By changing the amounts of rGO, the electromagnetic loss of the Fe3O4@rGO composites can be effectively regulated, which obtain better reflection loss. The minimum reflection loss of the Fe3O4@rGO composites is −49.4 dB at 16.2 GHz only with a thickness of 1.75 mm. Thus, the Fe3O4@rGO composites have an extremely thin thickness and a strong electromagnetic wave absorption capacity, which is a candidate for the development of lightweight magnetic absorbing materials. Full article
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22 pages, 9903 KiB  
Article
Tuning Electro-Magnetic Interference Shielding Efficiency of Customized Polyurethane Composite Foams Taking Advantage of rGO/Fe3O4 Hybrid Nanocomposites
Nanomaterials 2022, 12(16), 2805; https://doi.org/10.3390/nano12162805 - 16 Aug 2022
Cited by 9 | Viewed by 1562
Abstract
Electromagnetic interference (EMI) has been recognized as a new sort of pollution and can be considered as the direct interference of electromagnetic waves among electronic equipment that frequently affects their typical efficiency. As a result, shielding the electronics from this interfering radiation has [...] Read more.
Electromagnetic interference (EMI) has been recognized as a new sort of pollution and can be considered as the direct interference of electromagnetic waves among electronic equipment that frequently affects their typical efficiency. As a result, shielding the electronics from this interfering radiation has been addressed as critical issue of great interest. In this study, different hybrid nanocomposites consisting of magnetite nanoparticles (Fe3O4) and reduced graphene oxide (rGO) as (conductive/magnetic) fillers, taking into account different rGO mass ratios, were synthesized and characterized by XRD, Raman spectroscopy, TEM and their magnetic properties were assessed via VSM. The acquired fillers were encapsulated in the polyurethane foam matrix with different loading percentages (wt%) to evaluate their role in EMI shielding. Moreover, their structure, morphology, and thermal stability were investigated by SEM, FTIR, and TGA, respectively. In addition, the impact of filler loading on their final mechanical properties was determined. The obtained results revealed that the Fe3O4@rGO composites displayed superparamagnetic behavior and acceptable electrical conductivity value. The performance assessment of the conducting Fe3O4@rGO/PU composite foams in EMI shielding efficiency (SE) was investigated at the X-band (8–12) GHz, and interestingly, an optimized value of SE −33 dBw was achieved with Fe3O4@rGO at a 80:20 wt% ratio and 35 wt% filler loading in the final effective PU matrix. Thus, this study sheds light on a novel optimization strategy for electromagnetic shielding, taking into account conducting new materials with variable filler loading, composition ratio, and mechanical properties in such a way as to open the door for achieving a remarkable SE. Full article
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