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Inter‑Skeleton Conductive Routes Tuning Multifunctional Conductive Foam for Electromagnetic Interference Shielding,Sensing and Thermal Management

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Nano-Micro Letters 2025年第3期17卷 19-36页

作者： Xufeng Li Chunyan Chen Zhenyang Li Peng Yi Haihan Zou Gao Deng Ming Fang Junzhe He Xin Sun ronghai yu Jianglan Shui Caofeng Pan Xiaofang Liu School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191People’s Republic of China Tianmushan Laboratory Xixi Octagon CityYuhang DistrictHangzhou 310023People’s Republic of China Science and Technology On Electromagnetic Scattering Laboratory Beijing Institute of Environmental FeaturesBeijing 100854People’s Republic of China

Conductive polymer foam(CPF)with excellent compressibility and variable resistance has promising applications in electromagnetic interference(EMI)shielding and other integrated functions for wearable ***,its insufficient change amplitude of resistance with compressive strain generally leads to a degradation of shielding performance during ***,an innovative loading strategy of conductive materials on polymer foam is proposed to significantly increase the contact probability and contact area of conductive components under *** inter-skeleton conductive films are constructed by loading alginate-decorated magnetic liquid metal on the polymethacrylate films hanged between the foam skeleton(denoted as AMLM-PM foam).Traditional point contact between conductive skeletons under compression is upgraded to planar contact between conductive ***,the resistance change of AMLM-PM reaches four orders of magnitude under ***,the inter-skeleton conductive films can improve the mechanical strength of foam,prevent the leakage of liquid metal and increase the scattering area of EM ***-PM foam has strain-adaptive EMI shielding performance and shows compression-enhanced shielding effectiveness,solving the problem of traditional CPFs upon *** upgrade of resistance response also enables foam to achieve sensitive pressure sensing over a wide pressure range and compression-regulated Joule heating function.

关键词： Inter-skeleton conductive films Conductive polymer foam Liquid metal Electromagnetic interference shielding

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Enhanced microwave absorption properties of rod-shaped Fe2O3/Fe3O4/MWCNTs composites

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Progress in Natural Science:Materials International 2018年第3期28卷 288-295页

作者： Lina Huang Xiaofang Liu ronghai yu School of Materials Science and Engineering Beihang University

A novel type of composite absorber,***2O3/Fe3O4/MWCNTs composites（0%,1.7%and 5%MWCNTs）,with microwave absorption properties was successfully fabricated by a facile hydrothermal *** preparedα-Fe2O3/Fe3O4nanoparticles displayed rod-shaped *** complex permittivity and permeability of the Fe2O3/Fe3O4/MWCNTs composites distinctly increased,furthermore,with the introduction of MWCNTs,the Fe2O3/Fe3O4/MWCNTs composites exhibited fine microwave absorption performance with strong absorption and wide absorption *** particular,for Fe2O3/Fe3O4/1.7%MWCNTs composite with an absorber thickness of 2.5 mm,the reflection loss（RL）reached a minimum of-44.1 d B at 10.4 GHz and the effective absorption bandwidth（RL2O3/Fe3O4/MWCNTs composites was attributed to the high dielectric loss and improved impedance matching which was closely related to the rod-shaped morphology of Fe2O3,Fe3O4and the introduction of MWCNTs.

关键词： Fe2O3/Fe3O4/MWCNTs composites Microwave absorption Electromagnetic properties MWCNTs

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Environmentally Tough and Stretchable MXene Organohydrogel with Exceptionally Enhanced Electromagnetic Interference Shielding Performances

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Nano-Micro Letters 2022年第5期14卷 77-91页

作者： yuanhang yu Peng Yi Wenbin Xu Xin Sun Gao Deng Xiaofang Liu Jianglan Shui ronghai yu School of Materials Science and Engineering Beihang UniversityBeijing 100191People’s Republic of China Science and Technology on Optical Radiation Laboratory Beijing Institute of Environmental FeaturesBeijing 100854People’s Republic of China Science and Technology on Electromagnetic Scattering Laboratory Beijing Institute of Environmental FeaturesBeijing 100854People’s Republic of China

Conductive hydrogels have potential applications in shielding electromagnetic(EM)radiation interference in deformable and wearable electronic devices,but usually suffer from poor environmental stability and stretching-induced shielding performance *** organohydrogels can improve the environmental stability of materials,their development is at the expense of reducing electrical conductivity and thus weakening EM interference shielding ***,a MXene organohydrogel is prepared which is composed of MXene network for electron conduction,binary solvent channels for ion conduction,and abundant solvent-polymer-MXene interfaces for EM wave *** organohydrogel possesses excellent anti-drying ability,low-temperature tolerance,stretchability,shape adaptability,adhesion and rapid self-healing *** effective strategies have been proposed to solve the problems of current organohydrogel shielding *** reasonably controlling the MXene content and the glycerol-water ratio in the gel,MXene organohydrogel can exhibit exceptionally enhanced EM interference shielding performances compared to MXene hydrogel due to the increased physical cross-linking density of the ***,MXene organohydrogel shows attractive stretching-enhanced interference effectiveness,caused by the connection and parallel arrangement of MXene *** well-designed MXene organohydrogel has potential applications in shielding EM interference in deformable and wearable electronic devices.

关键词： Electromagnetic interference shielding MXene organohydrogel Stretchable conductive film Anti-drying ability Lowtemperature tolerance

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Optimizing impedance matching by a dual-carbon Co-regulation strategy of Co_(3)O_(4)@rGO/celery stalks derived carbon composites for excellent microwave absorption

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Journal of Materials Science & Technology 2023年第2期133卷 1-11页

作者： Xiubo Xie yukun Wang Xueqin Sun Heshan Wang ronghai yu Wei Du Hongjing Wu School of Environmental and Material Engineering Yantai UniversityYantai 264005China MOE Key Laboratory of Material Physics and Chemistry under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

Both macroscopic composition and microstructure should be considered for reasonable microwave ab-sorbent *** this study,Co_(3)O_(4)@reduced graphene oxide(rGO)/Celery stalks derived carbon(CDC)was prepared by loading Co_(3)O_(4) particles into rGO and biomass-derived carbon mixture through oxidation *** changing the mass ratio of rGO to CDC,the dielectric and impedance matching proper-ties of the composites can be easily *** RL min value of Co_(3)O_(4)@rGO/CDC_(13) composite(weight ratio for rGO:CDC is 1:3)reaches-84.3 dB with a thickness of 4.6 mm,and the widest effective band-width can be obtained at 4.5 GHz with a matching thickness of 2.8 *** Co_(3)O_(4)@rGO/CDC_(13) compos-ite with multiple components(Co_(3)O_(4),CDC,rGO)and 3D net structure produces magnetic/dielectric loss combinations,interfacial polarization,and multiple reflections and scattering,and the CDC with half tube and half sheet structure is conducive to the optimization of impedance *** strategy of co-regulating dielectric properties of materials with double carbon provides a novel pathway for the prepa-ration of lightweight,low-cost,and high-performance absorbers.

关键词： Microwave absorption Graphene Co_(3)O_(4) Biomass carbon Impedance matching

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Yolk-shell structured Co-C/Void/Co9S8 composites with a tunable cavity for ultrabroadband and efficient low- frequency microwave absorption

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Nano Research 2018年第8期11卷 4169-4182页

作者： Xiaofang Liu Chengcheng Hao Lihua He Cheng Yang yubin Chen Chengbao Jiang ronghai yu School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Institute of Aeronautical Materials Beijing 100095 China

A yolk-shell structured Co-C/Void/CogS8 ternary composite composed of a Co nanoparticle-embedded porous carbon core and Co9S8 shell was synthesized by the sulfidation of a Co-based zeolitic imidazolate framework and subsequent pyrolysis. The composition and interior cavity of the Co-C/Void/CogS8 composite could be precisely modulated by controlling the sulfidation reaction. Due to the abundant heterointerfaces, well-controlled cavity, and magnetic-dielectric synergistic effects, the Co-C/Void/CogS8 exhibited excellent and tunable microwave- absorbing properties. The optimized Co-C/Void/Cog~ having a loading of 25 wt.% and thickness only 2.2 mm, displayed an ultrabroad absorption bandwidth of 8.2 GHz at high frequencies. Moreover, the composite could achieve an extremely high reflection loss of -54.02 dB at low frequencies by adjusting its loading to 30 wt.%. This study provides a new insight into promising lightweight microwave-absorbing materials with ultrabroad absorption bandwidths and strong low-frequency absorption.

关键词： yolk-shell structure metal organic framework sulfide microwave absorption broad bandwidth

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Honeycomb-like MXene/NiFeP_(x)–NC with“continuous”single-crystal enabling high activity and robust durability in electrocatalytic oxygen evolution reactions

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Journal of Advanced Ceramics 2023年第3期12卷 553-564页

作者： Xiaojun Zeng Yifei Ye Yongqing Wang ronghai yu Martin Moskovits Galen D.Stucky Advanced Ceramic Materials Research Institute School of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Department of Chemistry and Biochemistry University of California Santa BarbaraCA 93106USA

The development of low-cost,stable,and robust non-noble metal catalysts for water oxidation is a pivotal challenge for sustainable hydrogen production through electrocatalytic water ***,such catalysts suffer from high overpotential and sluggish kinetics in oxygen evolution reactions(OERs).Herein,we report a“continuous”single-crystal honeycomb-like MXene/NiFeP_(x)–N-doped carbon(NC)heterostructure,in which ultrasmall NiFeP_(x)nanoparticles(NPs)encapsulated in the NC are tightly anchored on a layered ***,this MXene/NiFeP_(x)–NC delivers outstanding OER catalytic performance,which stems from“continuous”single-crystal characteristics,abundant active sites derived from the ultrasmall NiFeP_(x)NPs,and the stable honeycomb-like heterostructure with an open *** experimental results are rationalized theoretically(by density functional theory(DFT)calculations),which suggests that it is the unique MXene/NiFeP_(x)–NC heterostructure that promotes the sluggish OER,thereby enabling superior durability and excellent activity with an ultralow overpotential of 240 mV at a current density of 10 mA×cm^(−2).

关键词： layered MXene ultrasmall NiFePx nanoparticles(NPs) “continuous”single-crystal honeycomb-like heterostructure oxygen evolution reaction(OER)activity

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Critical role of carbon support in metal nanoaggregate facilitating Fe-N-C catalyst for PEM fuel cell application

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Journal of Energy Chemistry 2024年第10期97卷 669-676,I0014页

作者： Liming Guo Xin Wan Qingtao Liu Xiaofang Liu Jiaxiang Shang ronghai yu Jianglan Shui School of Materials Science and Engineering Beihang UniversityBeijing 100191China Tianmushan Laboratory Hangzhou 310023ZhejiangChina

Metal nanoaggregates can simultaneously enhance the activity and stability of Fe-N-C catalysts in proton-exchange-membrane fuel cells(PEMFC).Previous studies on the relevant mechanism have focused on the direct interaction between FeN_(4)active sites and metal ***,the role of carbon support that hosts metal nanoaggregates and active sites has been ***,a Fe-N-C catalyst encapsulating inactive gold nanoparticles is prepared as a model catalyst to investigate the electronic tuning of Au nanoparticles(NPs)towards the carbon *** NPs donate electrons to carbon support,making it rich inπelectrons,which reduces the work function and regulates the electronic configuration of the FeN_(4)sites for an enhanced ORR ***,the electron-rich carbon support can mitigate the electron depletion of FeN_(4)sites caused by carbon support oxidation,thereby preserving its high *** yield and accumulation of H_(2)O_(2)are thus alleviated,which delays the oxidation of the catalyst and benefits the *** to the electron-rich carbon support,the composite catalyst achieves a top-level peak power density of 0.74 W/cm^(2) in a 1.5 bar H_(2)-air PEMFC,as well as the improved *** work elucidates the key role of carbon support in the performance enhancement of the FeN-C/metal nanoaggregate composite catalysts for fuel cell application.

关键词： Fuel cells Oxygen reduction reaction Fe-N-C Hetero-structure catalyst Carbon support

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Doping Induced Tailoring in the Morphology,Band-Gap and Ferromagnetic Properties of Biocompatible ZnO Nanowires, Nanorods and Nanoparticles

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Nano-Micro Letters 2014年第3期6卷 242-251页

作者： Javed Iqbal Tariq Jan yu ronghai Sa jjad Haider Naqvi Ishaq Ahmad Laboratory of Advanced Materials Department of Material Science and Engineering Tsinghua University Laboratory of Nanoscience and Technology Department of Physics International Islamic University Islamabad School of Materials Science and Engineering Beihang University Karachi University Nanational Center for Physics (NCP) Quaid-i-Azam University

The modification of nanostructured materials is of great interest due to controllable and unusual inherent properties in such materials. Single phase Fe doped Zn O nanostructures have been fabricated through simple, versatile and quick low temperature solution route with reproducible results. The amount of Fe dopant is found to play a significant role for the growth of crystal dimension. The effect of changes in the morphology can be obviously observed in the structural and micro-structural investigations, which may be due to a driving force induced by dipole-dipole interaction. The band gap of Zn O nanostructures is highly shifted towards the visible range with increase of Fe contents, while ferromagnetic properties have been significantly *** prepared nanostructures have been found to be nontoxic to SH-SY5 Y Cells. The present study clearly indicates that the Fe doping provides an effective way of tailoring the crystal dimension, optical band-gap and ferromagnetic properties of Zn O nanostructure-materials with nontoxic nature, which make them potential for visible light activated photocatalyst to overcome environmental pollution, fabricate spintronics devices and biosafe drug delivery agent.

关键词： ZnO Fe doping Dipole-dipole interaction Band-gap tailoring Ferromagnetism Cytotoxicity

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Oriented magnetic liquid metal-filled interlocked bilayer films as multifunctional smart electromagnetic devices

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Nano Research 2023年第1期16卷 1764-1772页

作者： Jinjin Li yue Zhang Xufeng Li Chunyan Chen Haihan Zou Peng Yi Xiaofang Liu ronghai yu School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Smart electromagnetic functional devices prepared based on electromagnetic wave responsive materials will provide more convenience for human life in the ***,we prepare oriented magnetic liquid metal droplet-filled polydimethylsiloxane films with micropillar array patterned surfaces,and further assemble them into bilayer films with interlocked *** compressed,the increase in conductivity of the film due to the tunneling effect between microarrays and the elongation of liquid metal droplets leads to a rapid increase in electromagnetic interference shielding ***,a tunable electromagnetic interference shielding material with high sensitivity and wide control range is obtained,which has potential applications in electromagnetic wave control systems and intelligent electromagnetic protection ***,we assemble a strain sensor and a magnetic sensor,which can precisely sense pressure and magnetic field according to changes in electromagnetic signal and electrical signal,respectively.

关键词： magnetic liquid metal electromagnetic interference shielding interlocked structure electromagnetic sensing magnetic sensing

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Coupling of ultrasmall and small CoxP nanoparticles confined in porous SiO2 matrix for a robust oxygen evolution reaction

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Nano Materials Science 2022年第4期4卷 393-399页

作者： Xiaojun Zeng Haiqi Zhang Xiaofeng Zhang Qingqing Zhang yunxia Chen ronghai yu Martin Moskovits School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen333403China Guangdong Academy of Science Guangdong Institute of New MaterialsNational Engineering Laboratory for Modern Materials Surface Engineering TechnologyThe Key Lab of Guangdong for Modern Surface Engineering TechnologyGuangzhou510650China School of Materials Science and Engineering Beihang UniversityBeijing100191China Department of Chemistry and Biochemistry University of California Santa BarbaraSanta BarbaraCA93106United States

Rational design of electrocatalysts is important for a sustainable oxygen evolution reaction(OER).It is still a huge challenge to engineer active sites in multi-sizes and multi-components ***,a series of CoxP nanoparticles(NPs)confined in an SiO2matrix(SiO2/CoxP)is designed and synthesized as OER *** phosphorization of the hydrolyzed Co-phyllosilicate promotes the formation of ultrasmall and small Co2P and *** are firmly confined in the *** coupling of multi-size and multi-component CoxP catalysts can regulate reaction kinetics and electron transfer ability,enrich the active sites,and eventually promote the intrinsic OER *** SiO2matrix provides abundant porous structure and oxygen vacancies,and these facilitate the exposure of active sites and improve *** of the synergy and interplay of multisized/component CoxP NPs and the porous SiO2matrix,the unique SiO2/CoxP heterostructure exhibits low overpotential(293 m V@10 mA cm-2),and robust stability(decay 12 mV after 5000 CV cycles,97.4%of initial current after 100 h chronoamperometric)for the OER process,exceeding many advanced metal phosphide *** work provides a novel tactic to design low-cost,simple,and highly efficient OER electrocatalysts.

关键词： Multi-size Multi-component Phyllosilicate SiO2/CoxP heterostructure OER

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