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Self-assembly tungsten selenide hybrid ternary MOF derived magnetic alloys via multi-polarization to boost microwave absorption

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nano Research 2024年第3期17卷 1625-1635页

作者： Tianbao Zhao Tingting Zheng Di Lan Yan Zhang Zhengshuo Sun Chao Wang Zirui Jia Guanglei Wu institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

Confronted with severe electromagnetic wave pollution,the development of high-performance electromagnetic wave shielding or absorbing materials is an effective way to deal with ***,double transition metal alloys and transition metal dichalcogenides have attracted extensive attention in electromagnetic wave absorption,but few reports have studied the effects of these two materials on electromagnetic wave absorption at the same *** this work,cobalt-based alloy with magnetic loss mechanism was selected for composition *** ternary metal-organic framework was prepared by the one-step method,and then CoCu/C was prepared by high temperature ***,in the hydrothermal process,ultra-thin tungsten selenide nanosheets were coated on the surface of magnetic component,and the final polyhedral WSe_(2)/CoCu/C composites with multiple heterogeneous interfaces were *** synergistic effect of dielectric and magnetic components optimizes impedance matching and allows more electromagnetic waves to enter the ***,through the conduction loss of high conductivity graphitized carbon,interfacial polarization,and dipole polarization of heterogeneous interfaces between the components,the magnetic loss provided by CoCu alloy can work together to maximize the attenuation ability of electromagnetic ***,the minimum reflection loss(RLmin)value of the composite reaches-53.43 dB when the matched thickness is 2.1 mm,while the maximum effective absorption bandwidth(EABmax)reaches 6.0 GHz at a thin thickness of 1.8 *** work provides some support and reference for the design of novel electromagnetic wave absorbing materials via the dielectric/magnetic loss synergistic mechanism.

关键词： metal-organic framework dielectric/magnetic loss transition metal dichalcogenide electromagnetic wave absorption

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Neutron diffraction studies of permanent magnetic materials

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Rare Metals 2020年第1期39卷 13-21页

作者： Wen-Yun Yang Dong Liang Xiang-Dong Kong Jin-Bo Yang State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing100871China Collaborative innovation Center of Quantum Matter Beijing100871China Beijing Key Laboratory for Magnetoeletric Materials and Devices Beijing100871China Department of micro-nano Fabrication technology Institute of Electrical EngineeringChinese Academy of SciencesBeijing100871China

Neutron diffraction technology as an advanced material research technique has special advantages in studying magnetic materials compared to the conventional techniques such as X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS).In this review,the applications of neutron diffraction technology on permanent magnetic materials were briefly reviewed:(1)the determination of the crystal structure and magnetic structure of the typical permanent magnet material,(2)in situ neutron diffraction study of the crystal structure evolution of the permanent magnets,and(3)phase transition in permanent magnetic materials.

关键词： Neutron diffraction Permanent magnetic materials Crystal structure Magnetic structure Structure evolution Phase transition

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Metamaterials beyond negative refractive index： Applications in telecommunication and sensing

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Science China(Technological Sciences) 2016年第7期59卷 1007-1011页

作者： LIU RuoPeng ZHAO ZhiYa JI ChunLin ZHOU Tian Kuang-Chi institute of Advanced technology Shenzhen 518000 China State Key Laboratory of Metamaterial electromagnetic Modulation technology Shenzhen 518000 China

Metamaterials have earned their name with extraordinary properties such as negative refractive index and invisibility cloaking. With over 15 years of research and development, metamaterials show their debut in real world applications, especially in the areas of telecommunication, sensing, aerospace & defense, optics and medical instrumentation. In the meanwhile, metamaterials are expanding their concept in areas beyond electromagnetics. In this paper, the authors would like to focus on the research and applications in telecommunication and sensing. Octave-bandwidth horn antennas, flat-panel satellite antennas and air-borne holographic satellite antennas are all fabulous examples of clever implementation that bring metamaterials into practical devices. We would like to discuss the features that differentiate metamaterials from conventional counterparts in case studies. With the advancement in design, manufacturing, packaging, detection and testing, more sophisticated features are expected in the telecommunication, sensing, and beyond.

关键词： metamaterial dispersion engineering field enhancement compressive sensing

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MOF-templated tubular Ni_(1−x)Co_(x)S_(2)-CdS heterojunction with intensified direct Z-scheme charge transmission for highly promoted visible-light photocatalysis

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nano Research 2024年第7期17卷 6281-6293页

作者： Chuan Jiang Yuanxin Qiu Xinxin Xin Yanyan Li Huilin Li Hui Wang Jixiang Xu Haifeng Lin Lei Wang Volodymyr Turkevych Key Laboratory of Eco-chemical Engineering International S&T Cooperation Foundation of Eco-chemical Engineering and Green ManufactureCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber-Plastics of Ministry of EducationSchool of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China V.Bakul institute for Superhard Materials National Academy of Sciences of UkraineKyiv 04074Ukraine

Hollow semiconductor nanostructures with direct Z-scheme heterojunction have significant advantages for photocatalytic reactions,and optimizing the interfacial charge transmission of Z-scheme heterojunction is the hinge to achieve excellent solar conversion *** this work,tubular Ni_(1−x)Co_(x)S_(2)-CdS heterostructures with reinforced Z-scheme charge transmission were constructed through an In-metal-organic framework(MOF)templated *** Z-scheme charge transfer mechanism was sufficiently confirmed by combining density functional theory(DFT)calculation,X-ray photoelectron spectroscopy(XPS),surface photovoltage spectroscopy(SPV),and radical testing ***,the use of sodium citrate complexant contributes to the formation of intimate heterointerface,and the Fermi level gap between CdS and NiS_(2)is enlarged through Co doping into NiS_(2),which enhances the built-in electric field and photo-carriers transmission driving force for Ni_(1−x)Co_(x)S_(2)-CdS heterojunction,resulting in an evidently promoted activity toward H2 evolution reaction(HER).Under visible-light(λ>400 nm)irradiation,the Ni_(1−x)Co_(x)S_(2)-CdS composite with 10 mol%Co doping and 80 wt.%CdS(NC_(0.10)S-80%CdS)achieved an outstanding HER rate up to 35.94 mmol·g^(−1)·h^(−1)(corresponding to the apparent quantum efficiency of 34.7%at 420 nm),approximately 76.4 times that of 3 wt.%Pt-loaded CdS and it is much superior to that of most CdS-based photocatalysts ever ***,the good photocatalytic durability of Ni_(1−x)Co_(x)S_(2)-CdS heterostructures was validated by cycling and long-term HER *** work could inspire the development of high-performance Z-scheme heterojunction via optimizing the morphology and interfacial charge transmission.

关键词： tubular heterostructure Z-scheme charge transmission interfacial coupling built-in electric field visible-light photocatalysis

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Multifunctional Integrated Organic-Inorganic-Metal Hybrid Aerogel for Excellent Thermal Insulation and electromagnetic Shielding Performance

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nano-micro Letters 2024年第10期16卷 163-175页

作者： Zhaoqi Niu Fengjin Qu Fang Chen Xiaoyan Ma Beixi Chen Luyao Wang Miao Xu Shumeng Wang Liang Jin Chengshuang Zhang Xiao Hou Ministry of Industry and Information technology Key Laboratory of Special Function and Smart Polymer Materials Key Laboratory of Materials Physics and Chemistry of Ministry of Education for Extraordinary ConditionsNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Spallation Neutron Source Science Center Institution Dongguan 523803People's Republic of China institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People's Republic of China China Aerospace Science and Industry Corporation Sixth Academy Hohhot 022185People's Republic of China Xi'an Aerospace Composites Research institute Xi'an 710025People's Republic of China China Aerospace Science and technology Corporation Beijing 100037People's Republic of China

Vehicles operating in space need to withstand extreme thermal and electromagnetic environments in light of the burgeoning of space science and *** is imperatively desired to high insulation materials with lightweight and extensive mechanical ***,a boron-silica-tantalum ternary hybrid phenolic aerogel(BSiTa-PA)with exceptional thermal stability,extensive mechanical strength,low thermal conductivity(49.6 mW m^(-1)K^(-1)),and heightened ablative resistance is prepared by an expeditious *** extremely thermal erosion,the obtained carbon aerogel demonstrates noteworthy electromagnetic interference(EMI)shielding performance with an efficiency of 31.6 dB,accompanied by notable loading property with specific modulus of 272.8 kN·m kg^(-1).This novel design concept has laid the foundation for the development of insulation materials in more complex extreme environments.

关键词： Multi-hybrid aerogel Metal-phenolic coordination Thermal insulation EMI shielding Convertibility and multifunctionality

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Synergistic effect and heterointerface engineering of cobalt/carbon nanotubes enhancing electromagnetic wave absorbing properties of silicon carbide fibers

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nano Research 2024年第9期17卷 8479-8486页

作者： Zixiang Zhao Zheyipei Ma Zizhao Ding Yanqiong Liu Mingwei Zhang Chao Jiang institute of Powder Metallurgy Research Central South UniversityChangsha 410083China

To improve the synergistic effect between dielectric and magnetic loss is a practical and effective way in optimizing electromagnetic wave absorbing *** composites of metal particles and carbon ligands derived from metal organic frameworks have gained wide *** this study,Co particles and multiwalled carbon nanotubes(CNT)were successfully synthesized covering the surface of silicon carbide(SiC)fibers,and the morphology,interfaces and electromagnetic wave absorption performance were *** sample SiC@Co/CNT,the minimum reflection loss value can reach-70.22 dB at 11.21 GHz with the thickness of 2.12 *** effective absorbing bandwidth can reach up to 6.03 GHz with the thickness of 1.71 mm,which covers the entire Ku *** brings more interfaces between Co particles and CNTs as well as SiC fibers and Co/C *** interfacial polarization has been hugely enhanced,and the microwave absorbing properties have been *** article reports on the impedance matching of magnetic and non-magnetic components and the heterointerface engineering,which can be effective strategy and inspiration to illustrate the relationship between components,structures and functions of electromagnetic wave absorbing materials.

关键词： metal organic frameworks Co nanocrystals carbon nanotubes Schottky heterointerfaces synergistic effect

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Efficient and Explicit Fourier Modal Method for Ultrathin Metallic Gratings

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Chinese Journal of Electronics 2022年第6期31卷 1155-1160页

作者： LI Jie SHI Lihua JIN Xin ZHANG Qi RAN Yuzhou LEI Qi MA Yao LIU Yicheng XIAO Jie WANG Jianbao National Key Laboratory on electromagnetic Environment Effects and Electro-optical Engineering Army Engineering University of PLA Dongbei University of Finance and Economics National innovation institute of Defense technology Academy of Military Sciences Unit 31007 of the PLA Cangxi School Education Bureau of Xinhua County

The solution of large matrix eigenvalues and complex linear equations limits the Fourier modal method(FMM) application in ultrathin metallic gratings(UMG) analysis. This paper proposes an efficient and explicit FMM method for analyzing UMG. The proposed method avoids solving complex linear equations and eigenvalues of eigenmatrix in the conventional method by simplifying the implementation equations. Two numerical examples then verify the reliability of the proposed method compared with CST simulations and the conventional method. The proposed method is proven efficient in decreasing the CPU time by over 80% and demanding significantly less memory.

关键词： Fourier modal method Ultrathin metallic gratings Computational efficiency Eigenvalues

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Equivalent circuit model for the insulated core transformer

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Nuclear Science and Techniques 2016年第3期27卷 132-137页

作者： Bo Yang Lei Cao Jun Yang Sheng-Chi Yan Yi-Bin Tao China Electric Power Research institute Nanjing 210003China State Key Laboratory of Advanced electromagnetic Engineering and technology Huazhong University of Science and TechnologyWuhan 430074China

The design of the insulated core transformer(ICT)needs to consider the flux leakage *** equivalent linear circuit model is proposed based on the principle of *** is composed by two types of leakage inductances:conventional leakage between windings and special leakage introduced mainly by the insulation *** values of leakage inductances depend on the dimensions of the core,gaps,or windings and the property of magnetic *** circuit allows for quantitatively evaluating influences of ICT internal parameters on its output *** winding self- and mutual inductance matrix is mathematically converted to derive the inductance *** an example,the leakage parameters of a sixstage two-dimensional(2D) ICT are calculated and analyzed.

关键词：等效电路模型变压器绝缘性能影响电感计算对偶原理等效线性磁性材料

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Antioxidant high-conductivity copper paste for low-cost flexible printed electronics

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npj Flexible Electronics 2022年第1期6卷 176-184页

作者： Shuqing Hong Chimin Liu Shuqiang Hao Wenxing Fu Jian Peng Binghui Wu Nanfeng Zheng Pen-Tung Sah institute of micro-nano Science and technology State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

The flexible printed electronics(e.g.,wearable devices,roll-up displays,heating circuits,radio frequency identification(RFID)tags)calls for high-conductivity and low-cost materials,particularly for copper *** is still a big challenge to develop reliable copper pastes for both antioxidant and high-conductivity flexible printed films and *** this work,an antioxidant copper paste was achieved using copper microflakes with surface passivation by formate ions and thiols,with high conductivity of 13400 S cm^(−1)(the same order of magnitude of silver pastes,1.8-2.5×10^(4) S cm^(−1)).The universal applications of as-prepared copper paste in flexible printed electronics(e.g.,electromagnetic interference(EMI)shielding films,anti-fog films,and RFID tags)via screen printing and curing at 170℃ under ambient atmosphere were *** as-printed electronics showed high performance in flexibility,stability,and *** work shows the great potential of anti-oxidation copper pastes in low-cost flexible printed electronics for commercial usage.

关键词： paste copper cost

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The Realization of Terahertz Image Reconstruction with High Resolution Based on the Amplitude of the Echoed Wave by using the Phase Retrieval Algorithm

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Chinese Physics Letters 2013年第6期30卷 212-215页

作者： GAO Xiang LI Chao FANG Guang-You institute of Electronics Chinese Academy of SciencesBeijing 100190 Key Laboratory of electromagnetic Radiation and Sensing technology Chinese Academy of SciencesBeijing 100190

An indirect imager working at terahertz band is presented and implemented,which is suitable for high-resolution planar object *** proposed imager employs a simple quasi-optics design to transmit and to receive terahertz waves,and adopts incoherent detection technology to extract the intensity of echoed signal,which results in a relatively low complexity and ***,the Fienup Fourier phase-retrieval algorithm is successfully modified and is applied to retrieve the phase of the echoed signal and reconstruct the target *** experiments on typical planar objects are performed with the imager working at 0.2 THz,and the experimental results demonstrate the good performance of the proposed imager and validate the effectiveness of the reconstruction algorithm.

关键词： image planar optics

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