JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongchun Yu,Maomao He,Zhuo Wang,Feng Han,Yongze Cao,Runze Han,Yang He,Shanshan Li,Yusha Lan,Luran Zhang
Carbon-based magnetic composites derived from metal-organic frameworks (MOFs) have emerged as promising candidates for electromagnetic wave absorption. In this study, graded structured spherical cobalt-iron/carbon (CoFe/C) composites were fabricated via a stepwise in-situ pyrolysis strategy using bimetallic CoFe-MOF precursors. The composite pyrolyzed at 700 ℃ exhibits exceptional microwave absorption properties: it achieves a minimum reflection loss (RL) of −80.3 dB at 9.68 GHz with a 3.00 mm thickness, along with an effective absorption bandwidth (EAB, RL < −10 dB) of 4.8 GHz (7.9–12.7 GHz), fully covering the entire X-band. Notably, when the thickness decreases to 2.20 mm, the EAB expands to 6.7 GHz (11.3–18.0 GHz), spanning the complete Ku-band. Mechanistic analysis reveals that the superior performance arises from two critical factors: optimized impedance matching enabled by synergistic dielectric and magnetic loss mechanisms, and intensified electromagnetic wave scattering through the graded spherical architecture. This work provides a scalable synthesis protocol for bimetallic composites while demonstrating a rational design strategy for high-performance broadband microwave absorbers.
研究领域:
材料科学
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电磁学
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纳米技术
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jintao Huang,Xinfei Zeng,Wentao Yu,Haichen Zhang,Yonggang Min
Electromagnetic wave (EMW) absorption materials play a unique role in both civilian and military domains, hence the creation of high-performance EMW absorbing materials that are “light, thin, broad, and strong” is of significant importance. In this study, we introduced nanoscale nickel metal into the precursor solution during the polymerization phase via in-situ polymerization, and then combined phase separation and high-temperature pyrolysis to prepare polyimide-based porous carbon (PIC)/Ni nano-particles composite (PIC/Ni). The experimental outcomes demonstrate that the introduction of Ni nano-particles, which bring about magnetic loss, has improved the narrow effective absorption bandwidth of the single PIC EMW absorbing material. By controlling the carbonization temperature, it was found that PIC/Ni-700 has a strong capability for EMW loss. Moreover, at a thickness of 4.21 mm, the PIC/Ni-700 exhibits the strongest EMW loss capability at a frequency of 6.16 GHz, recording a minimum reflection loss (RL) of −39.41 dB. PIC/Ni-700 demonstrates effective absorption bandwidth (EABW) of 5.20 GHz (2.0 mm) and 4.16 GHz (2.5 mm), showcasing its characteristic of broadband absorption.
研究领域:
材料科学
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电磁工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxin Ding,Chenfeng Sun,Meiyi Wang,Yuexiang Hu,Guojun Cheng,Jun Liu
The 2D nanomaterial has been widely used in the field of electromagnetic wave absorption because of its high specific surface area and special electrical properties. In this work, three 2D materials were integrated to form a unique ternary composite with Ti 3 C 2 T x MXene as the substrate, RGO as the intercalator with additional components, and CoFe-LDH loaded on the MXene/RGO surface. The interfacial and dipole polarizations were notably enhanced due to the abundant formation of heterogeneous interfaces between the three 2D materials and their corresponding abundant functional groups and defects, and the space between the 2D lamellae enabled multiple reflections of electromagnetic waves. Compared with pure MXene, the MXene/RGO/CoFe-LDH composites exhibited excellent electromagnetic wave absorption performance due to the synergy of multiple loss mechanisms, resulting in the best reflection loss value of −58.9 dB at 13.12 GHz.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yang Guo,Xian Jian,Haipeng Lu
Engineering a lightweight and thin microwave absorber through the design of multiple heterogeneous interfaces represents a significant challenge. Here, we synthesized a nitrogen (N)-doped Ti 3 C 2 T x @Fe 3 O 4 (N–Ti 3 C 2 T x @Fe 3 O 4 ) nanocomposite with a sandwich-like structure through a solvothermal approach using hydrazine hydrate as the N donor. The numerous Ti 3 C 2 T x electron transfer pathways of Ti 3 C 2 T x enable the realization of a hierarchical conduction network within N–Ti 3 C 2 T x @Fe 3 O 4 . The introduction of defects through N doping and the integration of Fe 3 O 4 with Ti 3 C 2 T x are pivotal for enhancing the dipole polarization. The heterogeneous interfaces in N–Ti 3 C 2 T x @Fe 3 O 4 , coupled with Fe 3 O 4 components, substantially boost the electromagnetic wave (EMW) absorption performance of the composite. An optimal N integration and the loading of Fe 3 O 4 in Ti 3 C 2 T x result in an improved impedance matching of N–Ti 3 C 2 T x @Fe 3 O 4 . The synergistic effect of the improved impedance matching and the strong EMW attenuation capability endow N–Ti 3 C 2 T x @Fe 3 O 4 with enhanced microwave absorption (MA) properties. Specifically, at a thickness of 1.04 mm, the composite exhibits the effective absorption bandwidth (3.92 GHz; 14.08–18.00 GHz), surpassing that of Ti 3 C 2 T x . At a thickness of 0.98 mm, it exhibits a maximum reflection loss of −40.28 dB at 17.25 GHz, which substantially exceeds that of Ti 3 C 2 T x . Furthermore, it shows a maximum Radar Cross Section reduction of 21.32 dB cm 2 . A cotton fabric was coated with N–Ti 3 C 2 T x @Fe 3 O 4 , and it was found to exhibit enhanced heat conduction and dissipation, at rates 3.83 and 4.64 times greater than those of uncoated cotton, respectively. These results highlight the considerable potential of N–Ti 3 C 2 T x @Fe 3 O 4 nanocomposites for use in far-field applications. It is envisaged that the exceptional MA and thermal management properties of N–Ti 3 C 2 T x @Fe 3 O 4 nanocomposites will provide a novel avenue for crafting lightweight and thin EMW absorbing materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Ting Zhao,Han Zhang,Hai-Hong Zhang,De-Qiang Yi,Jian-Feng Zhu,Yi Qin
The rapid development of communications technology has exacerbated the deterioration of the electromagnetic environment and therefore there is an urgent need to develop efficient electromagnetic wave absorbing materials. Based on the idea of constructing the ferrite-alloy-glass multiphase heterogeneous microstructure, core-shell-like NiFe 2 O 4 /Ni 3 Fe/LAS nanocomposites has been successfully prepared by using sol-gel, hydrothermal and in situ reduction methods. In which, NiFe 2 O 4 and Ni 3 Fe provide strong magnetic and dielectric losses , while the introduction of the LAS (Lithium aluminum silicate, Li 2 O–Al 2 O 3 –SiO 2 glass) wave-transparent phase modulates the complex dielectric constant, and effectively improving impedance matching. The multi-component nature of NiFe 2 O 4 /Ni 3 Fe/LAS produces abundant heterogeneous interfaces, and the strong interfacial polarization contributes to the attenuation of electromagnetic waves. At the thickness of 2.3 mm, the reflection loss (RL) of NiFe 2 O 4 /Ni 3 Fe/LAS reaches −50.7 dB at 11.36 GHz with an effective absorption bandwidth (EAB) of 5.04 GHz, while at 2.0 mm the EAB is up to 7 GHz. Importantly, the NiFe 2 O 4 /Ni 3 Fe/LAS nanocomposites achieve effective absorption (RL < −10 dB) in the C, X and Ku bands (5–18 GHz). This work is expected to offer prospects for high-performance and ultra-broadband composite microwave-absorbing materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Deqing Zhang,Yingfei Xiong,Junye Cheng,Hassan Raza,Chuanxu Hou,Tingting Liu,Xuewei Ba,Ping Zhang,Maosheng Cao
As a novel 2D transition metal sulfide material, WS 2 has been proven to possess potential electromagnetic wave absorption (EMWA) property due to its peculiar electronic structure. However, the intrinsic weak impedance match and single dielectric loss domination of this material only produce high-frequency electromagnetic absorption (EMA), which is seemingly futile for the prevalent low-band 4G and 5G EMW. In this study, efforts have been made to effectively texture rod-like TiO 2 semiconductor with different mass ratios on the a few layers of WS 2 nanosheets via a simple step-by-step hydrothermal method. It is found that the WS 2 /TiO 2 hybrids loaded with 10% TiO 2 at a sample thickness of 5.30 mm, the minimum RL is −43.90 dB at 5.12 GHz. When the thickness of the sample is 2.00 mm, the bandwidth with RL value less than −10 dB can reach 4.70 GHz, and the effective EMA band could be adjusted in a range of 13.84 GHz (4.16–18 GHz) by increasing the thickness from 1.0 mm to 5.5 mm. It was found that the introduction of TiO 2 nanosheets with high dielectric loss into the dielectric WS 2 nanosheets can produce a synergistic effect. The benefits of such synergestic effect include, optimization of the EMA strength and bandwidth, and a reduction of the effective EMA frequency band from high frequency to low frequency. This study paves a new avenue for the future design of low-frequency EMA materials with high efficiency.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 3
·1055
·
IF 4.927
Yifan Zhang,Rui Cai,Dashuang Wang,Kailin Li,Qing Sun,Yuntao Xiao,Hao Teng,Xiaohan Huang,Tao Sun,Zhaohui Liu,Kexin Yao,Yuxin Zhang,Pingan Yang
The porous and biomimetic cobalt silicate@diatomite (Co2SiO4@diatomite) was successfully synthesized by a two-step method, including the hydrothermal method and calcination to improve the electromagnetic wave absorption property. Different hydrothermal times were well-tuned for Co2SiO4@diatomite composites with different loadings of Co2SiO4. Interestingly, the Co2SiO4@diatomite composites (6 h, 25 wt%) had a smaller minimum reflection loss. Moreover, the minimum reflection loss (RLmin) could reach −12.03 dB at 16.64 GHz and the matched absorber thickness was 10 mm, while the effective absorption bandwidth (EAB, RL ≤ −10 dB) could be 1.92 GHz. In principle, such findings indicate that Co2SiO4@diatomite nanocomposites could be a promising candidate for high-efficiency microwave absorption capability.Keywords:diatomite;Co2SiO4;electromagnetic wave absorption;nanomaterial
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 28
·期 1
·233
·
IF 4.927
Qing Sun,Xin Yang,Tie Shu,Xianfeng Yang,Min Qiao,Dashuang Wang,Zhaohui Liu,Xinghua Li,Jinsong Rao,Yuxin Zhang,Pingan Yang,Kexin Yao
Recently, the development of composite materials composed of magnetic materials and MXene has attracted significant attention. However, the thickness and microwave absorption performance of the composite is still barely satisfactory. In this work, the C-N@NiFe2O4@MXene/Ni nanocomposites were successfully synthesized in situ by hydrothermal and calcination methods. Benefiting from the introduction of the carbon-nitrogen(C-N) network structure, the overall dielectric properties are improved effectively, consequently reducing the thickness of the composite while maintaining excellent absorption performance. As a result, the minimum reflection loss of C-N@NiFe2O4@MXene/Ni can reach −50.51 dB at 17.3 GHz at an ultralow thickness of 1.5 mm, with an effective absorption bandwidth of 4.95 GHz (13.02–18 GHz). This research provides a novel strategy for materials to maintain good absorption performance at an ultralow thickness level.Keywords:electromagnetic wave absorption;MXene;NiFe2O4
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Wenjuan Zhang,Hanhong Xu,Yuheng Li,Yaxian Wang,Xiangyue Yang,Youliang Wang,Henan Jia,Yongqian Shen,Wei Zhang,Tomasz Wejrzanowski
With the rapid advancement of digital and communication technologies, electromagnetic pollution poses an increasingly serious threat to the environment and precision instruments. In this study we report a three-dimensional MXene/PPy/Fe 3 O 4 (3D MPF) composite with an ordered three-dimensional network structure constructed by an in-situ self-assembly method. The porous structure of 3D MPF was adjusted to induce the assembly of MXene nanosheets through different EDA additions. The 3D MPF exhibits cross-linked and interpenetrating conductive networks that facilitate efficient electron transfer and reflection. The multi-layer heterogeneous interfaces and functional groups of the 3D MPF generate more polarization defects, causing significant reflection and scattering of incident electromagnetic waves. Moreover, the inclusion of Fe 3 O 4 supports magnetic loss and optimizes the impedance matching of the 3D MPF. The 3D MPF exhibits a maximum reflection loss of −55.21 dB at a thickness of 3.31 mm when the ratio of MXene to Fe 3 O 4 is 1:1. At a thickness of 1.41 mm, the effective absorption bandwidth reaches 3.44 GHz (from 13.84 GHz to 17.28 GHz). By adjusting the matching thickness, the effective absorption bandwidth of the 3D MPF ranges from 3.44 GHz to 18 GHz, with reflection losses below −10 dB, indicating its significant potential in electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuling Chen,Tian Gao,Ying Ren,Changjiang Xiao
The demand for high-performance electromagnetic wave absorbent materials continues to grow with advancing technology. This study reports the synthesis of Bi 2 Fe 4 O 9 /Fe 3 O 4 nanoflower to enhance electromagnetic wave absorption. Bi 2 Fe 4 O 9 , synthesized via a hydrothermal method, was composited with different content Fe 3 O 4 nanocrystals. The strong binding between sheets of nanoflowers provides large surface area and active sites for electromagnetic wave absorption (EMA). The combination of Bi 2 Fe 4 O 9 and Fe 3 O 4 markedly enhanced the dielectric and magnetic properties, resulting in exceptional EMA performance. The sample achieved a minimum reflection loss (RL min ) of −75 dB at 7.0 GHz with a thickness of just 2.5 mm, along with a maximum effective absorption bandwidth (EABW) of 9.2 GHz. The broadband and strong absorption on electromagnetic wave is attributed to the synergistic effects of ferroelectric properties from Bi 2 Fe 4 O 9 and spinel structure of Fe 3 O 4 , supported by strong dipole coupling, interfacial polarization, and high-spin states of Fe ions. The underlying mechanism is thoroughly discussed, and the results demonstrate superior performance compared to similar studies in the field.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaopeng Han,Huiwu Cai,Guangheng Wang,Shuai Zhang,Xudong Liu,Ying Huang
Hierarchical structural design has been verified as a feasible strategy to fabricate effective electromagnetic wave (EMW) absorbers, so we designed hierarchical core–sheath composites with magnetic particles and dielectric layers. In this work, a hierarchical structure of carbon fiber (CF)@Fe3O4@MoS2 (CPDF7-M) was prepared by introducing Fe3O4 and depositing MoS2 layers on the surface of fibers. Due to the synergistic effects from the CF@Fe3O4 increasing the conductive and magnetic loss and the outer MoS2 layers improving the impedance matching, the optimal reflection loss (RL) value was −63.1 dB at 2.7 mm and the effective absorption bandwidth (EAB) was 9.1 GHz covering the X and Ku band. Moreover, the EAB values were adjusted with a specific MoS2 loading at different thicknesses, which provided the necessary reference for the construction of efficient and flexible absorbers in the EMW absorption fields.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Jundi Hu,Kun Liu,Zhuopeng Li,Yanhui Liu,Chao Ma,Daoyang Han,Hailong Wang,Rui Zhang,Gang Shao
The combination of 3D printing , polymer derived ceramics, and electromagnetic wave (EMW) absorption metamaterials is particularly useful for spacecraft stealth in extreme environments and is gradually gaining significant interest. While the 3D printing of SiOC has been extensively researched, the high temperature stability and mechanical performance of SiOC are not as favorable as SiCN. However, it remains challenging to prepare SiCN metamaterials with both high mechanical and microwave absorption properties by 3D printing. Herein, we demonstrate a SiCN EMW absorption metamaterial with high mechanical properties using digital light processing 3D printing, which achieves a minimum reflection loss of −31.01 dB (99.9 % absorption), and the widest effective absorption bandwidth covers the entire X-band from 8.2 to 12.4 GHz. And the EMW absorption performance can be adjusted based on the size of the unit structure.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）