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Heterogeneous MXene-based films with graded electrical conductivity towards highly efficient EMI shielding and electrothermal heating

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Nano Research 2024年第8期17卷 7264-7274页

作者： Yu Zhang Guangcheng Zhang zhonglei ma Jianbin Qin Xi Shen Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research Institute for Sports Science and Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

The increasing need for electromagnetic interference(EMI)shielding of electronics in cold environments such as those in aircraft,space exploration,and wearable heaters to avoid hazardous icing conditions or hypothermia requires the development of thin and lightweight EMI shielding materials preferably by absorbing rather than reflecting electromagnetic(EM)waves while also generating heat through energy-efficient electrothermal ***,it is challenging to achieve absorption-dominant EMI shielding and energy-efficient electrothermal heating simultaneously in a thin and lightweight ***,we develop a heterogeneous composite film comprising a porous multi-walled carbon nanotubes(MWCNTs)/bacterial cellulose(BC)film and an aligned MXene/Ag nanowires(NWs)backing via a sequential vacuum filtration *** porous film contains random conductive networks of MWCNTs with moderate conductivity while the aligned MXene sheets atop Ag NWs network affords high conductivity in the backing,giving rise to graded electrical conductivity for absorption-dominant EMI *** increasing Ag NW coverage leads to significantly increased electrical conductivity without increasing the EM wave reflection as well as the density and thickness of the film,yielding excellent specific EMI shielding effectiveness(>8500 dB/(g·cm^(2))),low driving voltage for energy-efficient electrothermal heating(163℃at 2.5 V),and fast response time(60 s)at a low areal density of 0.015 mg/cm^(2).Combining EMI shielding and electrothermal heating,the heterogeneous film developed here are promising contenders for the protection of electronic equipment in low-temperature environment.

关键词： heterogenous composite film MXene electromagnetic interference(EMI)shielding thermal management

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Multifunctional Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/polyimide)composite films with Janus structure for outstanding electromagnetic interference shielding and superior visual thermal management

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Nano Research 2022年第6期15卷 5601-5609页

作者： Yali Zhang zhonglei ma Kunpeng Ruan Junwei Gu Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Flexible multifunctional polymer-based electromagnetic interference(EMI)shielding composite films have important application values in the fields of 5G communication technology,wearable electronic devices and artificial *** this work,Fe_(3)O_(4)/polyamic acid(PAA)nanofiber films are prepared by in-situ polymerization and electrospinning technology,and Ti_(3)C_(2)T_(x)nanosheets are deposited on the surface of the Fe_(3)O_(4)/PAA nanofiber films via vacuum-assisted ***,Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/polyimide(PI))composite films are obtained by thermal *** two sides of the Janus films exhibit completely different *** Fe_(3)O_(4)/PI side has excellent hydrophobicity and insulation property,and the Ti_(3)C_(2)T_(x)side has hydrophilicity and terrific *** the mass fraction of Ti_(3)C_(2)T_(x)is 80 wt.%,the Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite film has excellent EMI shielding performances and mechanical properties,with EMI shielding effectiveness,tensile strength and Young’s modulus reaching 66 dB,114.5 MPa and 5.8 GPa,*** the same time,electromagnetic waves show different absorption shielding effectiveness(SEA)when incident from two sides of the Janus *** the electromagnetic waves are incident from the Fe_(3)O_(4)/PI side,the SEA of the Janus film is 58 dB,much higher than that when the electromagnetic waves are incident from the Ti_(3)C_(2)T_(x)side(39 dB).In addition,the Ti_(3)C_(2)T_(x)side of the Janus Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite films also has excellent electrothermal and photothermal conversion *** the applied voltage is 4 V,the stable surface temperature reaches 108°C;when it is irradiated by simulated sunlight with power density of 200 mW/cm2,the stable surface temperature reaches 95℃.

关键词： Janus structure Ti_(3)C_(2)T_(x)-(Fe_(3)O_(4)/PI)composite films electromagnetic interference shielding electrothermal conversion photothermal conversion

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High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures

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Nano-Micro Letters 2022年第3期14卷 244-256页

作者： Ping Song zhonglei ma Hua Qiu Yifan Ru Junwei Gu Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Queen mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of fifth-generation mobile com-munication technology and wearable electronic devices,electromagnetic interference and radiation pollution caused by electromagnetic waves have attracted worldwide ***,the design and development of highly efficient EMI shielding materials are of great *** this work,the three-dimensional graphene oxide(GO)with regular honeycomb structure(GH)is firstly constructed by sacrificial template and freeze-dry-ing ***,the amino functionalized FeNi alloy particles(f-FeNi)are loaded on the GH skeleton followed by in-situ reduction to prepare rGH@FeNi ***,the rGH@FeNi/epoxy EMI shielding com-posites with regular honeycomb structure is obtained by vacuum-assisted impregnation of epoxy *** from the construction of regular honeycomb structure and electromagnetic synergistic effect,the rGH@FeNi/epoxy composites with a low rGH@FeNi mass fraction of 2.1 wt%(rGH and f-FeNi are 1.2 and 0.9 wt%,respectively)exhibit a high EMI shielding effectiveness(EMI SE)of 46 dB,which is 5.8 times of that(8 dB)for rGO/FeNi/epoxy composites with the same rGO/FeNi mass *** the same time,the rGH@FeNi/epoxy composites also possess excellent thermal stability(heat-resistance index and temperature at the maximum decomposition rate are 179.1 and 389.0°C respectively)and mechanical properties(storage modulus is 8296.2 MPa).

关键词： Electromagnetic interference shielding rGO@FeNi Epoxy resins Honeycomb structures

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Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures

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Nano-Micro Letters 2022年第12期14卷 617-629页

作者： Lei Wang zhonglei ma Hua Qiu Yali Zhang Ze Yu Junwei Gu Shaanxi Key Laboratory of Catalysis School of Chemistry&Environment ScienceShaanxi University of TechnologyHanzhong 723001People’s Republic of China Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

High-efficiency electromagnetic interference(EMI)shielding materials are of great importance for electronic equipment reliability,information security and human *** this work,bidirectional aligned Ti_(3)C_(2)T_(x)@Fe_(3)O_(4)/CNF aerogels(BTFCA)were firstly assembled by bidirectional freezing and freeze-drying technique,and the BTFCA/epoxy nanocomposites with long-range aligned lamellar structures were then prepared by vacuum-assisted impregnation of epoxy *** from the successful construction of bidirectional aligned three-dimensional conductive networks and electromagnetic synergistic effect,when the mass fraction of Ti_(3)C_(2)T_(x) and Fe_(3)O_(4) are 2.96 and 1.48 wt%,BTFCA/epoxy nanocomposites show outstanding EMI shield-ing effectiveness of 79 dB,about 10 times of that of blended Ti_(3)C_(2)T_(x)@Fe_(3)O_(4)/epoxy(8 dB)nanocomposites with the same loadings of Ti_(3)C_(2)T_(x) and Fe_(3)O_(4).Meantime,the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability(T_(heat-resistance index) of 198.7℃)and mechanical properties(storage modulus of 9902.1 MPa,Young’s modulus of 4.51 GPa and hardness of 0.34 GPa).Our fabricated BTFCA/epoxy nanocomposites would greatly expand the applications of MXene and epoxy resins in the fields of information security,aerospace and weapon manufacturing,etc.

关键词： Electromagnetic interference shielding Epoxy nanocomposites Ti_(3)C_(2)Tx Fe_(3)O_(4) Bidirectional aligned three-dimensional conductive networks

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A mini-review of MXene porous films:Preparation,mechanism and application

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Journal of materials Science & Technology 2022年第8期103卷 42-49页

作者： Yali Zhang Yi Yan Hua Qiu zhonglei ma Kunpeng Ruan Junwei Gu Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

MXene presents excellent electrical conductivity,abundant surface functional groups and wonderful filmforming performance,but the lamellar layers are prone to self-stacking during film formation,which will reduce the loss of electromagnetic waves,hinder ion transmission,and limit the effective load of other functional *** construction of the porous structure can effectively solve the self-stacking problem of MXene *** article reviews the research progress of MXene porous films for electromagnetic interference(EMI)shielding,lithium/sodium ion batteries,pseudocapacitors,and biomedical science *** focuses on the preparation methods of MXene porous films,and discusses the pore-forming mechanism of the porous structure formed by different preparation methods and the internal relationship between the“microstructure-macroscopic performance”of the MXene porous films,points out the key scientific and technical bottlenecks that need to be solved urgently in the preparation and application of the MXene porous *** is hoped to provide certain guidance for the design,preparation,optimization,industrial application,and development of MXene porous films.

关键词： MXene porous films Preparation method Pore formation mechanism Application fields

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Hierarchical design of FeCo-based microchains for enhanced microwave absorption in C band

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Nano Research 2023年第1期16卷 1773-1778页

作者： Yixuan Han Mukun He Jinwen Hu Panbo Liu Zhongwu Liu zhonglei ma Wenbo Ju Junwei Gu Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Physics and Optoelectronics and School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China

Microwave absorbing materials(maMs)has been intensively investigated in order to meet the requirement of electromagnetic radiation control,especially in S and C *** this work,FeCo-based magnetic maMs are hydrothermally synthesized via a magnetic-field-induced *** composition and morphology of the maMs are capable of being adjusted simultaneously by the atomic ratio of Fe2+to Co2+in the *** hierarchical magnetic microchain,which has a core–shell structure of twodimensional FexCo1−xOOH nanosheets anchored vertically on the surface of a one-dimensional(1D)Co microchain,shows significantly enhanced microwave absorption in C band,resulting in a reflection loss(RL)of lower than−20 dB at frequencies ranging from 4.4 to 8.0 GHz under a suitable matching *** magnetic coupling of Co microcrystals and the double-loss mechanisms out of the core-shell structure are considered to promote the microwave attenuation *** hierarchical design of 1D magnetic maMs provides a feasible strategy to solve the electromagnetic pollution in C band.

关键词： one-dimensional micromagnets hierarchical structure microwave absorbing material magnetic coupling double-loss mechanisms

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Mechanically strong and folding-endurance Ti_(3)C_(2)T_(x) MXene/PBO nanofiber films for efficient electromagnetic interference shielding and thermal management

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Carbon Energy 2022年第2期4卷 200-210页

作者： Lei Wang zhonglei ma Yali Zhang Hua Qiu Kunpeng Ruan Junwei Gu Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxiP.R.China

Electromagnetic interference(EMI)shielding materials with excellent flexibility and mechanical properties and outstanding thermal conductivity have become a hot topic of research in functional *** this study,the“sol-gel-film conversion technique”is used to assemble polyetherimidefunctionalized Ti_(3)C_(2)T_(x) nanosheets(f-Ti_(3)C_(2)T_(x))with poly(p-phenylene-2,6-benzobisoxazole)(PBO)nanofibers(PNFs),followed by dialysis and vacuum drying to prepare f-Ti_(3)C_(2)T_(x)/PNF films with lamellar *** the loading of f-Ti_(3)C_(2)T_(x) is 70 wt%,the f-Ti_(3)C_(2)T_(x)/PNF film presents optimal comprehensive properties,with an EMI shielding effectiveness(SE)of 35 dB and a specific SE/thickness((SSE,SE/density)/t)of 8211 dB cm^(2)/g,a tensile strength of 125.1 MPa,an in-plane thermal conductivity coefficient(λ)of 5.82 W/(m K),and electrical conductivity of 1943 S/*** repeated folding for 10,000 cycles,the EMI SE and the tensile strength of f-Ti_(3)C_(2)T_(x)/PNFs films still remain 33.4 dB and 116.1 MPa,***,the f-Ti_(3)C_(2)T_(x)/PNF film also shows excellent thermal stability,flame retardancy,and structural *** would provide a novel method for the design and fabrication of multifunctional composite films and considerably expand the applications of MXene-and PNF-based composites in the fields of EMI shielding and thermal management.

关键词： electromagnetic interference shielding PBO nanofibers thermal management Ti_(3)C_(2)T_(x)MXene

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Electrospun Fluorinated Polyimide/Polyvinylidene Fluoride Composite Membranes with High Thermal Stability for Lithium Ion Battery Separator

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Advanced Fiber materials 2022年第1期4卷 108-118页

作者： Jianwei Li Xuanning Zhang Yuyan Lu Keliang Linghu Chen Wang zhonglei ma Xinhai He School of materials Science and Engineering Xi’an Polytechnic UniversityXi’an 710048China Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemical and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China National Advanced Functional Fiber Innovation Center Suzhou 215000China

The separator with excellent mechanical and thermal properties are highly required for lithium ion batteries(LIBs).Therefore,it is crucial to develop novel nanofbrous membranes with enhanced mechanical strength and thermal *** this work,the fuorinated polyimide(FPI)was synthesized and blended with polyvinylidene fuoride(PVDF)to fabricate composite nanofbrous membranes(CNMs)via electrospinning *** from the introduction of aromatic FPI,the prepared PVDF/FPI nanofbrous membranes were endowed with enhanced mechanical strength and thermal *** the FPI content increased from 0 to 30 wt%,the tensile strength of composite nanofbrous membranes enhanced from 1.57 to 2.30 ***,there are almost no dimensional shrinkage for the CNM-30 containing 30 wt%FPI after heat treatment at 160℃ for 1 ***,the prepared CNMs show improved electrochemical performances in comparison with neat PVDF and commercial Celgard *** electrolyte uptake and ionic conductivity of the CNMs could reach to 522.4% and 1.14 ms·cm^(−1),*** prepared CNMs could provide an innovative and promising approach for the development and design of high-performance separators.

关键词： Nanofbrous membrane PVDF Polyimide Lithium ion battery Separator

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Flexible Ti_(3)C_(2)T_(x)/(Aramid Nanofiber/PVA)Composite Films for Superior Eectromagnetic Interference Shielding

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Research 2022年第2期 213-224页

作者： Yali Zhang zhonglei ma Kunpeng Ruan Junwei Gu Shanxi Key Laboratory of macromolecular Science and Tefhnology School of Chemistry and Chemical EngineringNorthwestern Polytechmical UniversityXi'anShaanxi 710072China

Multifunctional electromagnetic interference(EMI)shielding materials would solve electromagnetic radiation and pollution problemsfrom ***,the directionalfreezedryingtechnology isutilizedtoprepare the aramid nanofber/polyvinyl alcohol aerogel with a directionally porous structure(D-ANF/PVA),and the Ti_(3)C_(2)T_(x)dispersion is fully immersed into the D-ANF/PVA aerogel via ultrasonication and vacuum-assisted ***_(3)C_(2)T_(x)/(ANF/PVA)EMI shielding composite films with directionally ordered structure(D-Ti_(3)C_(2)T_(x)/(ANF/PVA)are then prepared by freeze-drying and hot *** directionally porous structure enables the highly conductive TiCnanosheets to be wrapped on the directionally porous D-ANF/PVA framework in order arrangement and overlapped with each *** the hot pressing process effectively reduces the layer spacing between the stacked wavy D-ANF/PVA,to form a large number of TiCT T_(3)C_(2)T_(x)continuous conductive paths,which significantly improves the conductivity of the D-Ti_(3)C_(2)T_(x)/(ANF/PVA)EMI shielding composite film,When the amount of Ti_(3)C_(2)T_(x)is 80 wt%,the EMI shielding efectiveness(EMil SE)and specifc SE(SSE/t)of D-Ti_(3)C_(2)T_(x)/(ANF/PVA)EMI shielding composite film achieve 70 dB and 13790 dB-cmg(thickness and density of 120μm and 0.423g·cm^(-3))。far superior to random-structured T_(3)C_(2)T_(x)/(ANF/PVA)(R-TJCTM(ANF/PVA))composite film(46 dB and 9062 dBcm·g^(-3),respectively)via blending-freeze-drying followed by hot pressing ***,the D-TiCTJmaNF/PVA)EMII shielding composite flm possesses excellent flexibility and foldability.

关键词： composite directional film

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Structural Design Strategies of Polymer matrix Composites for Electromagnetic Interference Shielding:A Review

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Nano-Micro Letters 2021年第11期13卷 322-350页

作者： Chaobo Liang Zhoujie Gu Yali Zhang zhonglei ma Hua Qiu Junwei Gu Key Laboratory of Functional Nanocomposites of Shanxi Province College of Materials Science and EngineeringNorth University of ChinaTaiyuan 030051China Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXian 710072China Research and Development Center Guangdong Suqun New Materials Co.LtdDongguan 523000China

With the widespread application of electronic communication technology,the resulting electromagnetic radiation pollution has been significantly *** matrix electromagnetic interference(EMI)shielding materials have disadvantages such as high density,easy corrosion,difficult processing and high price,*** matrix EMI shielding composites possess light weight,corrosion resistance and easy ***,the current polymer matrix composites present relatively low electrical conductivity and poor EMI shielding *** review firstly discusses the key concept,loss mechanism and test method of EMI *** the current development status of EMI shielding materials is summarized,and the research progress of polymer matrix EMI shielding composites with different structures is illustrated,especially for their preparation methods and ***,the corresponding key scientific and technical problems are proposed,and their development trend is also prospected.

关键词： Polymer matrix composites Electromagnetic interference shielding Structural design

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