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Terahertz sensing with a 3D meta-absorbing chip based on two-photon polymerization printing

Photonics Research 2024年第5期12卷 895-903页

作者： XUEER CHEN LONGFANG YE DAQUAN YU School of Electronic Science and Engineering Xiamen UniversityXiamen 361005China Institute of electromagnetics and Aco.stics Xiamen UniversityXiamen 361005China Xiamen Sky Semico.ductor technology co. Ltd.Xiamen 361026China

The narrowband meta-absorbers exhibit significantly enhanced electromagnetic co.finement capabilities, showcasing broad application prospects in sensing fields. They can be applied for biomarker detection, chemical co.position analysis, and monitoring of specific gas in the environment. In this work, we propose a 3D meta-absorber with an out-of-plane plasma mechanism based on a two-photon printing system. co.pared to the co.ventional fabrication of a metal-insulator-metal 2D meta-absorber, the 3D absorber is co.posed of a metal layer and a resin layer from top to bottom;its manufacturing process is simpler, only including two-photon printing and magnetron sputtering deposition. A noticeable absorbing resonance appears at 0.3142 THz with perfect absorbance with a high Q-factor of 104.67. The theoretical sensitivity to the refractive index of the sensor reaches up to172.5 GHz/RIU, with a figure of merit (FOM) of 19.56. In the experiments, it was validated as a meta-absorber with high sensitivity for doxycycline (DCH). As the DCH co.centration increases from 0 to 4 mg/mL, the absorption intensity decreases around 49%, while the resonant frequency shift is around 70 GHz. It reflects the real-time residual co.tent of DCH, and is potentially applied in trace antibiotic detection. The results showcase a perfect narrowband absorption capability with strong electromagnetic co.finement in the terahertz spectrum, along with high-Q sensing characteristics of DCH. co.pared to 2D metamaterials, the diversity of3D metamaterial significantly expands, and introduces additional effects to provide greater flexibility in manipulating electromagnetic waves. The 3D device offers opportunities for the application of terahertz biochemical sensing.

关键词： absorber printing absorbing

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Reflection on methodology of the co.relation between electromagnetic interference and safety in high-speed railway

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Railway Sciences 2024年第1期3卷 84-96页

作者： Chang Liu Shiwu Yang Yixuan Yang Hefei Cao Shanghe Liu Department of electromagnetic Environmental Effects technology Studio CRSC Research and Design Institute Group Co.Ltd.BeijingChina School of Traffic and Transportation Shijiazhuang Tiedao UniversityShijiazhuangChina School of Automation and Intelligence Beijing Jiaotong UniversityBeijingChina Infrastructure technology Research Institute CRSC Research and Design Institute Group Co.Ltd.BeijingChina Research Center for electromagnetic Environmental Effects Shijiazhuang Tiedao UniversityShijiazhuangChina

Purpose – In the co.tinuous development of high-speed railways, ensuring the safety of the operation co.trolsystem is crucial. electromagnetic interference (EMI) faults in signaling equipment may cause transportationinterruptions, delays and even threaten the safety of train operations. Exploring the impact of disturbances onsignaling equipment and establishing evaluation methods for the co.relation between EMI and safety isurgently ***/methodology/approach – This paper elaborates on the necessity and significance of studying theimpact of EMI as an unavoidable and widespread risk factor in the external environment of high-speed railwayoperations and co.tinuous development. The current status of research methods and achievements from theperspectives of standard systems, reliability analysis and safety assessment are examined layer by ***, it provides prospects for innovative ideas for exploring the quantitative co.relation between EMIand signaling *** – Despite certain innovative achievements in both domestic and international standard systems andrelated research for ensuring and evaluating railway signaling safety, there’s a lack of quantitative and strategic research on the degradation of safety performance in signaling equipment due to EMI. A quantitativeco.relation between EMI and safety has yet to be established. On this basis, this paper proposes co.siderationsfor research methods pertaining to the co.relation between EMI and ***/value – This paper overviews a series of methods and outco.es derived from domestic andinternational studies regarding railway signaling safety, enco.passing standard systems, reliability analysisand safety assessment. Reco.nizing the necessity for quantitatively describing and predicting the impact ofEMI on high-speed railway signaling safety, an innovative approach using risk assessment techniques as abridge to establish the co.relation between EMI and signaling safety is proposed.

关键词： electromagnetic interference Reliability Safety Risk assessment Signaling system High-speed railway

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Facile fabrication of graphene/g-C_(3)N_(4) for electromagnetic wave absorption

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Nano Research 2024年第3期17卷 1687-1698页

作者： Qiang Su Yunfei He Dongdong Liu Daguang Li Long Xia Xiaoxiao Huang Bo Zhong School of Materials Science and Engineering Harbin Institute of Technology WeihaiWeihai 264209China Weihai Yunshan technology co. Ltd.Weihai 264200China State Key Laboratory on Integrated Optoelectronics College of Electronic Science&EngineeringJilin UniversityChangchun 130012China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

With the development of the miniaturization of electronic equipment and lightweight weapon equipment,there are new requirements for electromagnetic wave absorption material(EMWAM).EMWAM has outstanding electromagnetic wave absorption properties and lightweight characteristics beco.e an important direction of *** this study,graphene/g-C_(3)N_(4)(GGCN)EMWAM was first synthesized in situ by simple heat treatment,in which the g-C_(3)N_(4) had a porous structure and dispersed on the surface of *** impedance matching of the GGCN was well adjusted by decreasing the dielectric co.stant and attenuation co.stant due to the g-C_(3)N_(4) semico.ductor property and the graphite-like *** EMW loss mechanism of GGCN was also analyzed by simulating GGCN’s electric field mode distribution and resistance loss power *** analysis result shows that the distribution of g-C_(3)N_(4) among GGCN sheets can produce more polarization effects and relaxation effects by increasing the lamellar ***,the polarization loss of GGCN co.ld be increased successfully by porous g-C_(3)N_(4).Ultimately,the EMW absorption property of GGCN is optimized significantly,and GGCN exhibits excellent EMW absorption *** the thickness is 2 mm,the effective absorption bandwidth(EAB)can reach 4.6 GHz,and when the thickness is 4.5 mm,the minimum reflection loss(RLmin)at 4.56 GHz can reach-34.69 ***,the practical application of EMWAM was studied by radar cross-section(RCS)simulation,showing that GGCN has a good application prospect.

关键词： graphene/g-C_(3)N_(4) impedance matching simulation analysis dielectric loss excellent electromagnetic wave absorption

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Spontaneous anchoring Cl into α-co.OH）2 as efficient and stable oxygen reduction electrocatalysts for seawater battery

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Rare Metals 2024年第7期43卷 3074-3083页

作者： Wang Zheng Xue-Rong Zheng Qi Lu Yan-Hui Cao Yang Wang Hai-Peng Fu Jin-Feng Zhang Yi-Da Deng Wen-Bin Hu School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin University State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan University Key Laboratory of electromagnetic Processing of Materials Ministry of EducationNortheastern University

Seawater battery is an advanced energy storage system that enables co.version of chemical energy to electricity by co.suming metals,dissolved oxygen and seawater in anode,cathode and electrolyte,***,the oxygen reduction reaction（ORR） activity and stability of electrocatalysts can be easily deactivated due to the severe Cl-permeation and co.rosion in seawater ***,we developed a structural buffer engineering strategy by spontaneously anchoring Cl-into α-co.OH）2as efficient and stable ORR electrocatalysts,in which the ultrathin α-co.OH）2nanosheets were synthesized using an ultrafast solution high-temperature shock（SHTS） *** large lattice space（～ 0.8 nm） of layered α-co.OH）2ensured the spontaneously penetration of Cl-into the lattice structure and replaced part of OH-to form α-co.OH）*** co.tinuous leaching and co.pensating of saturated Cl in α-co.OH）2-xClxco.ld enhance the Cl-co.rosion resistance and modulate electronic structure of co.metallic sites,thus improving the ORR electrocatalytic activity and stability in seawater *** α-co.OH）2-xClxseawater batteries display superior onset and half-wave potentials of 0.71 and 0.66 V,respectively,which are much better than the co.nterparts of α-co.OH）2and of β-co.OH）2with no Cl-penetrating and no buffer *** α-co.OH）2-xClx-based seawater batteries display stable open-circuit potential of 1.69 V and outstanding specific capacity of 1345 mAh·g-1.

关键词： Seawater battery Oxygen reduction electrocatalyst Solution high-temperature shock Structural buffer engineering

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Enabling superior electrochemical performance of NCA cathode in Li_(5.5)PS_(4.5)Cl_(1.5)-based solid-state batteries with a dual-electrolyte layer

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Chinese Chemical Letters 2024年第4期35卷 231-236页

作者： Ziling Jiang Shaoqing Chen Chaochao Wei Ziqi Zhang Zhongkai Wu Qiyue Luo Liang Ming Long Zhang Chuang Yu School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced electromagnetic Engineering and technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Innovation Center for Chemical Sciences College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China co.lege of Physics and Energy Fujian Normal UniversityFuzhou 350117 China

LiNi_(0.8)co.(0.15)Al_(0.05)O_(2)(NCA) is a promising cathode for sulfide-based solid-state lithium batteries(ASSLBs)profiting from its high specific capacity and voltage plateau, which yielding high energy density. However, the inferior interfacial stability between the bare NCA and sulfides limits its electrochemical performance. Hereien, the dual-electrolyte layer is proposed to mitigate this effect and enhance the battery performances of NCA-based ASSLIBs. The Li_(3)InCl_6 wih high co.ductivity and excellent electrochemcial stability act both as an ion additives to promote Li-ion diffusion across the interface in the cathode and as a buffer layer between the cathode layer and the solid electrolyte layer to avoid side reactions and improve the interface stability. The co.responding battery exhibits high discharge capacities and superior cyclabilities at both room and elevated temperatures. It exhibits discharge performance of 237.04 and216.07 m Ah/g at 0.1 and 0.5 C, respectively, when cycled at 60 ℃, and sustains 95.9% of the capacity after100 cycles at 0.5 C. The work demonstrates a simple strategy to ensure the superior performances of NCA in sulfide-based ASSLBs.

关键词： LiNi_(0.8)co.(0.15)Al_(0.05)O_(2) Li_(5.5)PS_(4.5)Cl_(1.5) Double solid electrolyte layer co.figuration Operating temperatures Electrochemical performances

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Ultrathin and flexible MXene-co.tained electromagnetic interference shielding co.posite paper designed with a protective hydrogel film

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Journal of Materials Science & technology 2024年第2期169卷 199-208页

作者： Jiasheng Wei Lei Dai Ping He Meng Zhu Feng Jiang Zhaoxiang Zhou Guiqiang Fei Tingzhou Lei co.lege of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Eco.Textiles Ministry of EducationJiangnan UniversityWuxi 214122China Zhejiang Shunpu New Material technology co. LtdLongyou 324404China co.lege of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization Institute of Urban and Rural MiningChangzhou UniversityChangzhou 213164China

MXene-co.tained paper is a good choice to design ultrathin and flexible electromagnetic interference(EMI)shielding ***,the deficiencies in strength and stability of MXene-co.tained paper impede its practical ***,a co.posite paper was proposed to address the problems,in which a filter paper was modified with a three-layer structured surface via a facile layer-by-layer co.ting ***,the TEMPO-oxidized cellulose nanofibers(TOCN)/cationic starch(CS)/MXene gel layer and TOCN/MXene nacre structure layer ensured the good EMI shielding and mechanical performances of the co.posite paper,while the uppermost TOCN/CS hydrogel film layer mainly protected *** co.posite paper achieved an EMI SE of 40.3 dB at a thickness of merely 0.1894 mm(SE/t value of ca.212.8 dB mm^(−1),SSE/t values of ca.13216 dB cm 2 g^(−1))and the total MXene dosage was 20 g m^(−2).Its tensile strength co.ld be up to 11.7 MPa while the original filter paper was 6.4 *** pieces of this co.posite papers co.ld be easily packed together to attain an EMI SE of nearly 70 ***,the hydrogel film layer efficiently protected the MXene and maintained the EMI shielding performance of the co.posite paper when immersed in different liquids including water,HCl(1 M)and ethanol,due to the dense and co.pact structure of hydrogel film *** work provides a practical way to develop ultrathin,flexible and durable EMI shielding materials.

关键词： MXene electromagnetic interference shielding Nanocellulose Hydrogel

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Metal-organic framework-derived co.e_(2)@N-doped carbon nanocubes for high-performance lithium-ion capacitors

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Rare Metals 2024年第5期43卷 2150-2160页

作者： Lei Wang Xiong Zhang Yan-Yan Kong Chen Li Ya-Bin An Xian-Zhong Sun Kai Wang Yan-Wei Ma Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100190China Institute of Electrical Engineering and Advanced electromagnetic Drive technology Qilu ZhongkeJinan 250013China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

co.alt selenide(co.e_(2))has garnered co.siderable attention as a prospective anode candidate for advanced lithium-ion storage,prompting co.prehensive ***,co.e_(2)-based anodes usually suffer from significant volume variation upon lithiation leading to unsatisfactory cycling ***,a versatile synthesis route is proposed for the in-situ fabrication of co.e2nanoparticles embedded in N-dope carbon skeleton(co.e_(2)@NC)through annealing treatment and selenization of a metal–organic framework-derived(MOF)*** N-doped carbon derived from the MOF serves not only as an excellent co.ductive substrate but also as a co.fined reactor,effectively inhibiting the structural instability and alleviating the inevitable volume change of co.e_(2).Owing to their unique nanostructure,the as-prepared co.e_(2)@NC exhibits a high capacity of 745.9mAh·g^(-1)at 0.1 A·g^(-1),while maintaining excellent rate capability and an impressive ***,the assembled lithium-ion capacitor(LIC)based on co.e_(2)@NC demonstrates an energy density of 130Wh·kg^(-1),a power density of 24.6 kW·kg^(-1),and remarkable capacity retention of 90.8%after 8000 *** results highlight the great potential of co.e_(2)@NC for practical applications.

关键词： Lithium capacitors co.alt selenide Metal-organic frameworks N-doped carbon

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Synthesis and microwave absorption performance of heat-treated RF/SiO_(2)aerogels

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Defence technology（防务技术） 2024年第4期34卷 177-186页

作者： Xinli Ye Hao Yu Kai Zheng Shan Li Xiaomin Ma Bangxiao Mao Junxiong Zhang School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072PR China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057PR China Yangtze River Delta Research Institute of Northwestern Polytechnical University Suzhou 215400PR China National Equipment New Material&technology(Jiangsu)co. LtdSuzhou 215400PR China Beijing Xinfeng Aerospace Equipment co. LtdBeijing 100854PR China School of Textile and Clothing Nantong UniversityNantong 226019PR China

The well-designed co.posite with satisfactory electromagnetic microwave absorption at high temperatures remains a serious ***,we fabricated a resorcinol-formaldehyde/silica dioxide co.posite aerogel(RF/SiO_(2))with a three-dimensional network structure using sol-gel,atmospheric pressure drying technique as well as heat-treated processes to achieve enhanced microwave absorption capabilities in the low frequency *** pristine RF/SiO_(2)aerogel presented a typical micropores structure with a surface area,porous volume,and density of 146.82 m^(2)/g,62.40%,and 0.28 cm^(3)/g,***,the RF/SiO_(2)aerogel showed an effective absorption bandwidth of 3.56 GHz and a minimum reflection loss value of-46.10 d B at 2.25 mm after being heat-treated at 1500°C,while the maximum effective absorption bandwidth was 3.60 GHz at 2.30 *** intricate three-dimensional networks possessed remarkable impedance matching,multiple attenuation mechanisms,interfacial polarization,and dielectric loss,which were attributed to the exceptional ability to absorb electromagnetic *** offered a fresh approach to creating adaptable and effective microwave absorption materials in military defense.

关键词： RF/SiO_(2) Aerogel Heat-treated Microwave absorption

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A novel refined dynamic model of high-speed maglev train-bridge co.pled system for random vibration and running safety assessment

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Journal of Central South University 2024年第7期31卷 2532-2544页

作者： MAO Jian-feng LI Dao-hang YU Zhi-wu CAI Wen-feng GUO Wei ZHANG Guang-wen School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-speed Railway co.struction technology Changsha 410075China China Railway Group Limited Beijing 100039China China Railway Eryuan Engineering Group co. Ltd.Chengdu 610031China

Running safety assessment and tracking irregularity parametric sensitivity analysis of high-speed maglev train-bridge system are of great co.cern,especially need perfect refinement models in which all properties can be well characterized based on various stochastic excitations.A three-dimensional refined spatial random vibration analysis model of high-speed maglev train-bridge co.pled system is established in this paper,in which multi-source uncertainty excitation can be co.sidered simultaneously,and the probability density evolution method(PDEM)is adopted to reveal the system-specific uncertainty dynamic *** motion equation of the maglev vehicle model is co.posed of multi-rigid bodies with a total 210-degrees of freedom for each vehicle,and a refined electromagnetic force-air gap model is used to acco.nt for the interaction and co.pling effect between the moving train and track beam bridges,which are directly established by using finite element *** model is proven to be applicable by co.paring with Monte Carlo *** applying the proposed stochastic framework to the high maglev line,the random dynamic responses of maglev vehicles running on the bridges are studied for running safety and stability ***,the effects of track irregularity wavelength range under different amplitude and running speeds on the co.pled system are *** results show that the augmentation of train speed will move backward the sensitive wavelength interval,and track irregularity amplitude influences the response remarkably in the sensitive interval.

关键词： maglev train-bridge interaction electromagnetic force-air gap model stochastic dynamic analysis running safety assessment probability density evolution method

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Enhancing solid-state lithium metal battery performance via indium-based modification of electrolytes and lithium metal surfaces: mechanistic insights and optimization

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Science China Chemistry 2024年

作者： Zhongkai Wu Chen Liu Ziling Jiang Lin Li Siwu Li Chaochao Wei Qiyue Luo Xia Chen Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced electromagnetic Engineering and technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary Research Xidian University co.lege of Physics and Energy Fujian Normal University

Argyrodite-based solid-state lithium metal batteries exhibit significant potential as next-generation energy storage ***,their practical applications are co.strained by the intrinsic poor stability of argyrodite towards Li metal and exposure to air/***,an indium-involved modification strategy is employed to address these *** optimized doping yields a high Li-ion co.ductivity of 7.5 mS cm-1for Li5.54In0.02PS4.47O0.03Cl1.5electrolyte,acco.panied by enhanced endurance against air/moisture and bare Li *** retains 92.0%of its original co.ductivity after exposure to air at a low dew point of-60°C in dry ***,a co.posite layer co.prising Li–In alloy and LiF phases is generated on the surface of lithium metal anode via the reaction between In F3and molten *** layer effectively mitigates Li dendrite growth by creating a physical barrier from the robust LiF phase,while the Li–In alloy induces uniform Li-ion deposition and accelerates Li transport dynamics across the interphase between the solid electrolyte/Li ***,the In-doped electrolyte facilitates the in-situ generation of Li–In alloy within its voids,reducing local current density and further inhibiting lithium dendrite ***,the co.bination of the Li5.54In0.02PS4.47O0.03Cl1.5electrolyte and the InF3@Li anode provides exceptional electrochemical performances in both symmetric cells and solid-state lithium metal batteries across different operating ***,the LiNbO3@LiNi0.7co..2Mn0.1O2/Li5.54In0.02PS4.47O0.03Cl1.5/InF3@Li cell delivers a high discharge capacity of 167.8 mAh g-1at 0.5 C under 25°C and retains 80.0%of its initial value after 400 *** work offers a viable strategy for designing functional interfaces with enhanced stability for sulfide-based solid-state lithium batteries.

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