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Reduced Graphene Oxide/Carbon Nanofiber Based Composite Fabrics with Spider Web‑like Structure for Microwave Absorbing Applications

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Advanced Fiber Materials 2022年第5期4卷 1164-1176页

作者： Xihua Wang Jing Qin Jin Cui Li Huang Ye Yuan Yibin Li School of Materials Science and Technology Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control TechnologyHebei University of TechnologyTianjin 300130People’s Republic of China School of Forensic Science and Technology Criminal Investigation PoliceUniversity of ChinaLiaoning 110854People’s Republic of China School of Electronic and Information Engineering Hebei University of TechnologyTianjin 300130People’s Republic of China School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China

Composite fabrics with excellent microwave absorbing performance are highly desired.Herein,reduced graphene oxide/carbon nanofiber(rGO/CNF)based composite fabrics with spider web-like structure were successfully synthesized by electrostatic spinning technique.The spider web-like structure in the composite fabrics provides a connected network for efficient conductive loss of microwave energies.Magnetic loss benefits from the deposited nickel nanoparticles(Ni NPs)anchored in the carbon nanofibers.Meanwhile,the deposited thin polypyrrole(PPy)layers on the conductive network acts as a protective layer for Ni NPs as well as provides abundant interfaces for dissipating electromagnetic energies,which endow the composite fabrics stable microwave absorbing performance.Due to the synergistic effect of microwave absorb-ing mechanism,the maximum Reflection loss(RL_(max))of the composite fabric at 6.72 GHz is-46.15 dB,and the effective absorption bandwidth(EAB)is as wide as 8.63 GHz(from 9.37 to 18 GHz).What's more,favorable mechanical and heat insulation properties of the composite fabrics reveal its multifunctional advantages.This rGO/CNF based composite fabric demonstrates a new direction for multifunctional and flexible microwave absorbing materials(MAMs).

关键词： Reduced graphene oxide Carbon nanofiber Reflection loss Microwave absorbing applications

A Review on Metal-Organic Framework-Derived Porous Carbon-Based Novel Microwave Absorption Materials

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Nano-Micro Letters 2021年第4期13卷 1-29页

作者： Zhiwei Zhang Zhihao Cai Ziyuan Wang Yaling Peng Lun Xia Suping Ma Zhanzhao Yin Yi Huang National Institute for Advanced Materials Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry Key Laboratory of Functional Polymer MaterialsCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)School of Materials Science and EngineeringNankai UniversityTianjin 300350People’s Republic of China

The development of microwave absorption materials(MAMs) is a considerable important topic because our living space is crowed with electromagnetic wave which threatens human’s health.And MAMs are also used in radar stealth for protecting the weapons from being detected.Many nanomaterials were studied as MAMs,but not all of them have the satisfactory performance.Recently,metal-organic frameworks(MOFs) have attracted tremendous attention owing to their tunable chemical structures,diverse properties,large specific surface area and uniform pore distribution.MOF can transform to porous carbon(PC) which is decorated with metal species at appropriate pyrolysis temperature.However,the loss mechanism of pure MOF-derived PC is often relatively simple.In order to further improve the MA performance,the MOFs coupled with other loss materials are a widely studied method.In this review,we summarize the theories of MA,the progress of different MOF-derived PC-based MAMs,tunable chemical structures incorporated with dielectric loss or magnetic loss materials.The different MA performance and mechanisms are discussed in detail.Finally,the shortcomings,challenges and perspectives of MOF-derived PC-based MAMs are also presented.We hope this review could provide a new insight to design and fabricate MOF-derived PC-based MAMs with better fundamental understanding and practical application.

关键词： Metal-organic frameworks Porous carbon Microwave absorption material Reflection loss Effective absorption bandwidth

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三维多孔碳基吸波材料的研究进展

Science China Materials 2022年第11期65卷 2911-2935页

作者：韩明睿杨云霏刘伟曾志辉刘久荣 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinan 250061China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

随着电磁波(EMW)污染的日益严重,开发高性能电磁波吸收材料(EWAMs)已成为研究热点.碳基EWAMs具有优异的物理、化学稳定性和高导电性带来的强介电损耗.特别是三维(3D)多孔碳基EWAMs在EMW吸收研究领域长盛不衰.3D多孔结构大大降低了材料... 详细信息

随着电磁波(EMW)污染的日益严重,开发高性能电磁波吸收材料(EWAMs)已成为研究热点.碳基EWAMs具有优异的物理、化学稳定性和高导电性带来的强介电损耗.特别是三维(3D)多孔碳基EWAMs在EMW吸收研究领域长盛不衰.3D多孔结构大大降低了材料的密度,有利于EMW的多次反射和散射,优化了阻抗匹配,因此有望实现“低密度、薄厚度、宽吸收带宽、强吸收”的目标.在此,我们首先阐明了相关的理论基础和评价方法.之后,我们以材料来源为主线索,总结了3D多孔碳基EWAMs的最新研究进展,并突出了其中一些独特而新颖的观点.最后,提出了3D多孔碳基EWAMs的挑战和前景,这将有助于高性能EWAMs的进一步发展.

关键词： carbon materials porous electromagnetic wave absorption Reflection loss impedance matching

Effects of Sm-doping on microstructure,magnetic and microwave absorption properties of BiFeO_(3)

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Journal of Rare Earths 2021年第7期39卷 835-843,I0003页

作者： Chuang Tian Qingrong Yao Zhaofei Tong Huaiying Zhou Guanghui Rao Jianqiu Deng Zhongmin Wang Jiang Wang School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

In this paper,polycrystalline samples of Bi_(1-x)Sm_(x)FeO_(3)(x=0,0.05,0.1,0.15) were successfully synthesized by sol-gel method.The effects of Sm concentration on the crystal structure,morphology,chemical states,magnetic properties and microwave absorption performance were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),a vibrating sample magnetometer(VSM) and a Vector network analyzer(VNA),respectively.The results show that the rare earth Sm doping causes the crystal structure to change.When x≤0.1,Bi_(1-x)Sm_(x)FeO_(3) is the distorted rhombohedral structure with space group R3c.With the increase of Sm doping amount to x=0.15,the phase structure of Bi_(1-x)Sm_(x)FeO_(3) changes from rhombohedral structure to cubic structure with the space group Pm3 m.The particle size decreases with the increase of the Sm doping amount.The analysis results show that Sm doping can effectively reduce the oxygen vacancies and significantly improve its magnetic properties.The results exhibit that moderately doped rare earth Sm element can effectively improve microwave absorption properties of Bi_(1-x)Sm_(x)FeO_(3) powders.When Sm doping amount of x is 0.1,the Bi_(0.9)Sm_(0.1)FeO_(3) compound has good microwave absorption performance,and the minimum Reflection loss value of Bi_(0.9)Sm_(0.1)FeO_(3) powder reaches about-32.9 dB at11.7 GHz,and its effective absorption bandwidth(RL <-10 dB) is 2.6 GHz with the optimal matching thickness of 2.0 mm.

关键词： BiFeO_(3) Crystal structure Magnetic properties Microwave absorption Reflection loss Rare earths

Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furnace slag

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 88-97页

作者： Peng Liu Li-bo Zhang Bing-guo Liu Guang-jun He Jin-hui Peng Meng-yang Huang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Yunnan Provincial Key Laboratory of Intensification Metallurgy Kunming 650093China National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology Kunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Science Kunming University of Science and TechnologyKunming 650500China Yunnan Energy Research Institute Co. Ltd.Kunming 650093China

The preparation of functional material titanium carbide by the carbothermal reduction of Ti-bearing blast furnace slag with microwave heating is an effective method for valuable metals recovery;it can alleviate the environmental pressure caused by slag stocking.The dynamic dielectric parameters of Ti-bearing blast furnace slag/pulverized coal mixture under high-temperature heating are measured by the cylindrical resonant cavity perturbation method.Combining the transient dipole and large π bond delocalization polarization phenomena, the interaction mechanism of the microwave macroscopic non-thermal effect on the titanium carbide synthesis reaction was revealed.The material thickness range during microwave heating was optimized by the joint analysis of penetration depth and Reflection loss, which is of great significance to the design of the microwave reactor for the carbothermal reduction of Ti-bearing blast furnace slag.

关键词： titanium-bearing blast furnace slag dielectric mechanism penetration depth Reflection loss microwave heating efficiency

Achieving strong microwave absorption capability and wide absorption bandwidth through a combination of high entropy rare earth silicide carbides/rare earth oxides

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Journal of Materials Science & Technology 2020年第12期47卷 216-222页

作者： Heng Chen Biao Zhao Zifan Zhao Huimin Xiang Fu-Zhi Dai Jiachen Liu Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China

Developing electromagnetic(EM) wave absorbing materials with low reflection coefficient and optimal operating frequency band is urgently needed on account of the increasingly serious EM pollution. However, the applications of common EM absorbing materials are encumbered by poor high-temperature stability, poor oxidation resistance, narrow absorption bandwidth or high density. Herein, the strong EM absorption capability and wide efficient absorption bandwidth of high entropy ceramics are reported for the first time, which are designed by a combination of the novel high entropy(HE) rare earth silicide carbides/rare earth oxides(RE3 Si2 C2/RE2 O3). Three HE powders, i.e., HERSC-1(HE(Tm0.2 Y0.2 Dy0.2 Gd0.2 Tb0.2)3 Si2 C2),HERSC-2 HE(Tm0.2 Y0.2 Dy0.2 Gd0.2 Tb0.2)3 Si2 C2/HE(Tm0.2 Y0.2 Dy0.2 Gd0.2 Tb0.2)2 O3) and HERSC-3(HE(Tm0.2 Y0.2 Dy0.2 Gd0.2 Tb0.2)3 Si2 C2/HE(Tm0.2 Y0.2 Dy0.2 Gd0.2 Tb0.2)2 O3), are synthesized. Although HERSC-1 exhibits a limited absorption effect(the minimum Reflection loss(RLmin) is-11.6 d B at 3.4 mm) and a relatively narrow effective absorption bandwidth(EAB) of 1.7 GHz, the optimal absorption RLminvalue and EAB of HERSC-2 and HERSC-3 are-40.7 d B(at 2.9 mm), 3.4 GHz and-50.9 d B(at 2.0 mm), 4.5 GHz,respectively, demonstrating strong microwave absorption capability and wide absorption bandwidth.Considering the better stability, low density and strong EM absorption effect, HE ceramics are promising as a new type of EM absorbing materials.

关键词： High entropy ceramics Rare earth silicide carbides Absorption materials Reflection loss Interfacial polarization

Recent progress of electromagnetic wave absorbers: A systematic review and bibliometric approach

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ChemPhysMater 2023年第3期2卷 197-206页

作者： Yuksel Akinay Umit Gunes BektaşÇolak Tayfun Cetin Mining Engineering Van Yuzuncu Yil UniversityVan 65080Turkey Naval Architecture and Marine Engineering Yildiz Technical UniversityBesiktasIstanbul 34349Turkey Natural Sciences Faculty Physics DepartmentGebze Technical UniversityGebz 41400Turkey Yuksekova Vocational High School Hakkari UniversityHakkari 30110Turkey

The electromagnetic wave absorption capabilities of an absorber depend on its dielectric and magnetic compo- nents, which determine its interfacial polarization, conductivity loss, magnetic loss, and other such mechanisms. In this study, a comprehensive review of the electromagnetic wave and material interaction was conducted. Moreover, for a better understanding of the trends and evolutionary developments in the study of the electro- magnetic wave absorber, 23300 documents dated between 1990 and 2020 were examined, which were obtained from Scopus using the keywords of “electromagnetic wave absorption ”and “microwave absorption ”. The data search in Scopus was conducted using the related keywords in the search bar for titles and abstracts. These results demonstrate that the majority of research regarding electromagnetic wave absorbers was conducted in China, which was followed by the United States. The number of published documents regarding the electromagnetic wave absorption field significantly increased between 1990 and 2020;these documents were mostly published as journal articles. With respect to the journal activity, the most productive journal was the “Journal of Alloys and Compounds ”, with a total of 592 articles. In addition, graphene and titanium dioxide were determined to be the materials that were most studied in the field of electromagnetic wave absorption.

关键词： Electromagnetic wave absorption Microwave absorption Bibliometric approach Reflection loss Composites

Magnetic and microwave absorbing properties of Ce-Co-based alloy powders driven with lanthanum content

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Journal of Rare Earths 2020年第7期38卷 749-754,I0003页

作者： Yu He Shunkang Pan Jingjing Yu School of Material Science and Engineering Guilin University of Electronic TechnologyGuilin 541004China

The composites of Ce-Co-based alloys doped with La content were fabricated via a vacuum arc melting method.The influences of La addition on microstructure,electromagnetic parameters,magnetic property and microwave absorbing property were measured by the corresponding equipment.The morphology characteristics manifest that all samples display sheet structure,and the average particle size of alloy powders increases with increasing La content The saturation magnetization(MS) decreases with increasing La addition as a whole.The minimum Reflection loss(RL) of La0.4Ce1.6Co17 alloy powder about-42.29 dB can be obtained about-42.29 dB at 7.84 GHz with the matching thickness of 1.8 mm,and the corresponding effective bandwidth can achieve about 2.24 GHz.In addition,the minimum RL frequency moves towards a lower frequency region as the La content increases.The minimum RL of La0.3Ce1.7Co17alloy powder is less than-20 dB ranging from 1.2 to 2.4 mm in the whole 4-16 GHz.The maximum bandwidth can reach about 4.88 GHz at the given thickness of 1.2 mm.In general,these all indicate that the La addition is beneficial to improving the microwave absorbing performance in both effective bandwidth and absorption intensity.

关键词： Ce-Co-Based alloys Magnetic property Microwave absorbing property Reflection loss Rare earths

Controllable preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic waves.As a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric loss.However,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this problem.In this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal treatment.By controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were obtained.The samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 GHz.Meanwhile,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior Reflection loss properties,the lowest Reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 GHz.The excellent microwave Reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape anisotropies.This study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss