JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Hongsen Chen,Dan Jin,Tingyou Yu,Yuguo Du,Xiaolong Yang
Ti 3 C 2 T x MXene material exhibits exceptional dielectric properties and a distinct layered structure, making it a noteworthy microwave absorbing material. However, its microwave absorption performance is limited due to poor impedance matching and a single loss mechanism. To address these issues, this work develops a solvothermal method to introduce the magnetic component CoNi alloy and generate organic polymer PANI through in-situ polymerization, resulting in the preparation of Ti 3 C 2 T x /PANI/CoNi ternary composites that significantly improve impedance matching and microwave absorption performance. The microwave absorption properties of the binary and ternary composites are compared, and the superior performance of the ternary composites is emphasized. Among the ternary composites, M-P-CN 3:1:8 exhibited an excellent microwave absorption performance, demonstrating a minimum RL value of −55.48 dB and an effective absorption bandwidth of 5.1 GHz at a thickness of 2.0 mm. The synergistic effect of multiple loss mechanisms, multilayer structures, and multiple interfacial polarization methods further contribute to the enhanced microwave absorption performance of ternary composites. This study provides a straightforward method for synthesizing and designing multi-component composite absorbing materials based on MXene.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yutian Cai,Runyang Zhou,Shanshan Zhang,Mengke Qiao,Yongzhi Cheng,Yingli Zhu,Hui Luo,Pingan Chen,Xiangcheng Li,Fu Chen
MOFs-derived magnetic carbon-based composites exhibit great application potentials in electromagnetic absorption field. Nowadays, the MOF-on-MOF hybrid materials, constructed by self-assembly of two or more MOFs, gradually become the prevailing precursors for efficient microwave absorbers due to the flexible structure and component design which are beneficial to improving microwave attenuation and optimizing impedance matching. Herein, the binary MOF-on-MOF hybrid templates MIL-88A@ZIF-67 has been fabricated based on a surfactant-assisted growth strategy, and subsequently thermally converted into the spindle-like Co 3 Fe 7 @NC/magnetic MWCNTs composites (CFM) through a DCDA-assisted carbothermal reduction method. It has been revealed that the carbothermal temperature could not only regulate the crystallinity of Co 3 Fe 7 alloys and magnetism of CFM composites, but also make significant impact on chemical and mesoscopic structure of conductively hierarchical architecture composed by surficial MWCNTs and pyrolytic carbon derived from various ligands of different MOFs. Among the three proposed absorbers in this work, the CFM-700 sample with densest surficial magnetic MWCNTs achieved a satisfied balance between intrinsic microwave consumption and impedance matching due to the magnetic-dielectric synergistic effect. The reflection loss of CFM-700 could keep staying below −20 dB in an ultra-wide range from 3.6 GHz to 18.0 GHz when the thickness varies from 1.3 mm to 5.45 mm. Moreover, the minimum reflection loss of CFM-700 is −68.75 dB at 1.88 mm and the effective absorbing bandwidth could reach 4.72 GHz at only 1.55 mm. It is believed that this work paves an inspiring way to design conductively hierarchical magnetic carbon-based composites with excellent microwave absorption through construction of MOF-on-MOF hybrid structures.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 36
·2401733
·
IF 27.4
Xin Wang,Xiaoming Chen,Qingyuan He,Yaozu Hui,Chaofan Xu,Baichuan Wang,Feihu Shan,Jie Zhang,Jinyou Shao
To obtain high-performance electromagnetic microwave (EM) absorption materials with broad effective absorption bandwidth ( EAB ) and reduced thickness, designing structures has proved to be a promising way. Herein, ultra-broadband multilayer bidirectional MXene/polyimide EM absorption aerogels containing multi-structures on scales ranging from the micro- to the macroscale are produced with the aid of electric and temperature fields. On the microscale, under the action of electric force and temperature gradient, the ordered structures made of aligned Ti 3 C 2 T x MXene nanosheets and the microscale layered aerogel walls enable the bidirectional aerogel to achieve a wide EAB of 8.58 GHz at a thickness of 2.1 mm. This is ascribed to the numerous aligned nanosheets and layered aerogel walls perpendicular to the incident EMs, facilitating the conversion of electromagnetic energy into electrical energy. Furthermore, on the macroscale, the multilayer bidirectional aerogel with non-gradient structures effectively resolves the conflict between impedance matching and energy loss, resulting in an ultrawide EAB of 9.41 GHz at a thickness of 3 mm. This innovative design of electric-field-assisted multilayer bidirectional aerogels with multiscale structural coupling may provide feasible and effective pathways for the development of advanced EM absorption materials.
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
CARBON
·
2024
·
IF 10.5
Dong Liu,Jimei Liu,Chong Li,Yanwen Ji,Yuxuan Han,Zhiwei Xue,Quanyong Lv,Jintao Chen,Yongxiao Wang,Hui Li
MXene (Ti 3 C 2 T x ) is an important category of two-dimensional (2D) materials due to its distinctive metallic conductivity and adjustable surface chemistry. The exceptional benefits of heterointerface and defects or viods, combined with the distinct electromagnetic (EM) properties, inject boundless potential into the advancement of MXene-based absorbers for EM absorbing materials. However, conventional synthetic methods depend on chemical etching of MAX powders (Ti 3 AlC 2 ) using hazardous HF or similar substances, resulting in MXene sheets with fluorine termination and limited stability in colloidal dispersions under ambient conditions. Herein, varied synthetic routes were proposed to prepare MXenes with different terminal groups by the fluoride-based salts, fluoride-free molten salts , and alkali etching. 2D MXene nanosheets with abundant surface groups are excellent EM absorbing materials, and the MXene etched by the Lewis acid CuCl 2 delivered remarkable reflection loss ( RL ) value of −47.56 dB at 2.5 mm and broad bandwidth of 4.8 GHz due to promoted interfacial polarization. By conducting a thorough examination of the structural changes in MXenes, this study aims to propose a viable method for delaminating single-layer MXene and elucidate the EM absorption mechanisms.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zilong Zhang,Shuai Wang,Yangyang Lv,Xiqiao Chen,Zhuang Wu,Yanhong Zou
In this work, MnO 2 -deposited graphene foams (MnO 2 /GFs) were synthesized using a simple hydrothermal method . By controlling the content of MnO 2 deposited on the surface of graphene skeleton, a series of MnO 2 /GFs composites are easily synthesized. Benefiting from the well-designed interconnected 3D porous network structure and strong interfacial polarization between MnO 2 nanoparticles and graphene skeleton, the MnO 2 /GFs composite displays excellent microwave absorbing properties. The optimized MnO 2 /GFs nanocomposite achieves the strongest electromagnetic absorption with a reflection loss (RL) of −53 dB and the qualified absorption bandwidth is up to 7.0 GHz. The results may provide some valuable design guidelines for lightweight, wide-band, and highly efficient electromagnetic wave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 39
·14508-14519
·
IF 8.307
Zhiwang Hao,Jimei Liu,Xinliang He,Yubo Meng,Xiaobin Wang,Dong Liu,Naitao Yang,Wenjie Hou,Chao Bian
Although the rapid advances of wireless technologies and electronic devices largely improve the quality of life, electromagnetic (EM) pollution increases the risk of exposure to EM radiation. Developing high-efficiency absorbers with a rational structure and wideband characteristics is of great significance to eliminate radiation pollution. Herein, Enteromorpha prolifera derived biochar which would provide a suitable surface and multiple polarizations has been prepared as the supporter to anchor nanoparticles. In addition, theoretical simulation results further confirm that radar wave scattering could be largely inhibited after coating with absorbing materials. As a result, the hybrid absorbers achieve remarkable EM absorption properties attributed to the synergistic magnetic–dielectric loss. Elaborate compositional and structural characterization studies indicate that the absorber has a large specific area and numerous polarization centers, which would make full use of waste biomass as light weight and broadband high-performance EM absorption materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 19
·6316-6323
·
IF 7.393
Yuexuan Li,Yugang Duan,Xiaoqing Kang
Microwave absorption materials (MAMs) are specialist kinds of composites applied in stealth technology and electromagnetic interference (EMI). However, it is tough to satisfy the ultrathin and broadband requirements due to the imperfect impedance matching with external air and single absorbing fillers. Herein, a lower concentration of short carbon fiber (SCF)/Prussian blue (PB)/Fe3O4/epoxy resin (EP)-based butterfly-scale metamaterial (BSM) absorber with ultrathin and broadband was achieved via integrated design and fabrication. This revealed that the synergic effect between the SCF/PB/Fe3O4/EP MAMs with dielectric–magnetic behavior and physical resonance loss of the periodic unit for the BSM absorber is profitable for improving the electromagnetic absorption performance. Furthermore, the integrated fabrication process completely avoided the interface effect in traditional metamaterials. As a result, the proposed BSM absorber exhibited an absorption bandwidth of 29.54 GHz below −9.5 dB (>88.7% absorption) under TE = 0° polarization in the 2–40 GHz frequency range and 35 GHz below −9.5 dB under TM = 50° polarization. Analysis of the micro- and macro-absorption mechanism implied that the magnetic loss mainly resulted in power loss compared with dielectric loss. This highlights that the BSM absorber is an appropriate candidate for further practical applications, such as communication devices and military equipment.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 5
·1042-1051
·
IF 6.707
Du Heng,Zhang Qipeng,Zhao Biao,Marken Frank,Gao Qiancheng,Lu Hongxia,Guan Li,Wang Hailong,Shao Gang,Xu Hongliang,Zhang Rui,Fan Bingbing
In order to prevent the microwave leakage and mutual interference, more and more microwave absorbing devices are added into the design of electronic products to ensure its routine operation. In this work, we have successfully prepared MoS 2 /TiO 2 /Ti 3 C 2 T x hierarchical composites by one-pot hydrothermal method and focused on the relationship between structures and electromagnetic absorbing properties. Supported by comprehensive characterizations, MoS 2 nanosheets were proved to be anchored on the surface and interlayer of Ti 3 C 2 T x through a hydrothermal process. Additionally, TiO 2 nanoparticles were obtained in situ . Due to these hierarchical structures, the MoS 2 /TiO 2 /Ti 3 C 2 T x composites showed greatly enhanced microwave absorbing performance. The MoS 2 /TiO 2 /Ti 3 C 2 T x composites exhibit a maximum reflection loss value of −33.5 dB at 10.24 GHz and the effective absorption bandwidth covers 3.1 GHz (13.9–17 GHz) at the thickness of 1.0 mm, implying the features of wide frequency and light weight. This work in the hierarchical structure of MoS 2 /TiO 2 /Ti 3 C 2 T x composites opens a promising door to the exploration of constructing extraordinary electromagnetic wave absorbents.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 31
·17489-17496
·
IF 2.936
Xiaodong Sun,Mingxu Sui,Guangzhen Cui,Ling Li,Xiaopeng Li,Xuliang Lv,Fan Wu,Guangxin Gu
Electromagnetic irradiation has caused environmental pollution and harmful effects on human health. The use of effective materials to attenuate electromagnetic energy is urgently required. In this study, Fe3O4 nanoparticles (NPs) decorated on a CuS platelet-based sphere (CuS/Fe3O4) with popcorn chicken-like micromorphology were synthesized through a solvothermal deposition method. The effects of reaction temperature and quantity of Fe3O4 NPs on the heterostructures, morphologies and electromagnetic absorption (EA) properties of the heterostructures were investigated. CuS/Fe3O4 heterostructures exhibited remarkable enhancement in comparison with pure Fe3O4 NPs and the CuS platelet-based sphere. With the contribution from dielectric and magnetic losses, a CuS/Fe3O4 heterostructure-loaded composite could achieve a minimum reflection loss (RL) of −61.32 dB at 14.00 GHz and an effective EA bandwidth (≤−10 dB) of 4.15 GHz at a thickness of only 1.5 mm simultaneously. The current study indicates that the CuS/Fe3O4 heterostructures can potentially be applied as advanced electromagnetic absorbers.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Hengdong Ren,Sheng Wang,Wei Lian,Jialin Ma,Yan Zhao,Yin Liu,Ling Bing Kong,Tian shu Zhang,Won-Chun Oh
Palygorskite (Pal) was used as frameworks to disperse Fe 3 O 4 and polyaniline (PANI) nanoparticles for the preparation of coral-like Pal-dispersed Fe 3 O 4 /PANI composites with improved electromagnetic absorption performance. The processing was a combination of hydrothermal synthesis and simple mechanical stirring. With increasing content of Pal, specific surface area of the Pal-dispersed Fe 3 O 4 /PANI composites was increased from 21.14 m 2 /g to 29.69 m 2 /g, while the composites exhibitd fluffy coral-like structure due to the cation exchange mechanism and rich silanol (Si-OH) group of Pal. Since various loss mechanisms and improved impedance matching , the Pal-dispersed Fe 3 O 4 /PANI displayed an optimal reflection loss of −62.45 dB and a broad effective absorption bandwidth of 5.05 GHz. Therefore, this work develops an inexpensive framework to disperse nanoparticles for electromagnetic absorption materials , while new application of Pal is proposed.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yi Hou,Jixiang Wang,Baijun Chen,Hui Zhang,Zichen Xiang,Haikui Zhu,Lixi Wang
To meet the requirements of lightweight and wideband attenuation for advanced electromagnetic (EM) absorption materials, the combination of both MOF composition and hierarchical structural design was applied as the strategy to prepare the MOF-derived Co@SiC nanowire (Co@SiCnw) nanocomposite aerogel. The hierarchical and laminated structures with multiple Co@SiCnw layers were constructed via a mixed growth-assisted freeze-drying and calcination process. The ultralightweight Co@SiCnw presents a low density of 0.11 g/cm3. With abundant second-phase polarization interfaces and enlarged EM wave attenuation channels to enhance dielectric and conductive loss, the optimized Co@SiCnw offers a minimal reflection loss (RLmin) of −61.4 dB at 10.0 GHz (2.64 mm) and an effective absorption bandwidth (EAB) as wide as 7.44 GHz with a sample thickness of only 2.16 mm. Furthermore, multifunctionalities, including low density, thermal insulation, and self-standing, were demonstrated for Co@SiCnw, making it a high-performance and practical microwave absorption material.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Renxin Xu,Hongyi Luo,Zhengyi Li,Yahan Gao,Wei Zhao,Xiao Li,Wei Jin,Dan Liu
Poor microwave-absorbing performance of a carbonaceous–magnetic hybrid at low frequency is one of the great challenges that needs to be solved urgently. Constructing a three-dimensional structure of a graphene-based absorber with high-loading ferrite nanoparticles onto graphene surfaces is an effective strategy to boost the low-frequency absorbability. Therefore, we constructed substrates of crumpled monolayer graphene oxide spheres by first spray-drying and synthesized high-loading iron hydroxide nanograins onto the substrates by a simple oil-bath heating. Followed by an annealing treatment under Ar gas, an ultrahigh Fe3O4 magnetic crystals loading onto crumpled spherical reduced graphene oxide hybrid (Fe3O4@crGO) was obtained. The wrinkled architecture provides a large number of interface angles for ultrahigh Fe3O4 nanocrystals to avoid the massive agglomeration, which lowers the complex permittivity and improves the complex permeability to perfect absorber’s impedance matching at low frequency. Meanwhile, the impressive conducting loss of rGO, magnetic loss of Fe3O4 nanograins, polarization loss of heterogeneous interfaces, and multiple reflection and scattering of microwaves within the three-dimensional architecture boost the attenuation capability of the absorber. As a result, the as-prepared Fe3O4@crGO-30 hybrid exhibits a superb reflection loss of −52.3 dB at 5.4 GHz. In addition, by tailoring the thickness ranging from 2.5 to 5.0 mm, full coverage absorption in C and X bands can be achieved. This work provides a simple, efficient, and promising way to prepare a graphene-based absorber with perfect low- and middle-frequency absorption capacity.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
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