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Enhanced electroless metallization of aramid fibers via non-destructive π–π surface engineering for EMI shielding

Composites Science and technology 2025年 269卷

作者： Zhang, Tianyi Guo, Jinglun Liu, Shuaijie Gong, Lang Hao, Xiaoyu Ye, Qian Kang, Jingyu Cao, Le Liu, Xuqing State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Shaanxi Xi'an710072 China School of Electric and Control Engineering Xi'an University of Science and Technology Xi'an710054 China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Shandong Yantai264006 China

Electromagnetic pollution has become a growing concern with the rapid expansion of 5G and 6G technologies, creating an urgent need for lightweight, flexible materials that can shield against electromagnetic interference (EMI) while also offering high electrical conductivity, strong mechanical properties, and reliable environmental stability. Aramid fiber-reinforced composites, already widely used in aerospace electronics due to their excellent strength and heat resistance, show significant potential for effective EMI shielding. However, because aramid fibers are chemically inert, it is challenging to achieve strong adhesion between EMI coatings and the fiber surface, which limits practical applications. Although chemical etching can create active sites for metal particle attachment, it often compromises the fibers’ intrinsic mechanical properties. To address this issue, a non-destructive π–π modification method was introduced. This process adds active sites to the otherwise inert fiber surface without damaging the fibers, thereby enabling a uniform and well-controlled electroless metal coating. Composites prepared using this approach display exceptional EMI shielding performance, exceeding 90 dB. Furthermore, computer simulations were conducted to evaluate the feasibility of applying these modified aramid fiber preforms in larger composite structures. The simulation outcomes are consistent with experimental findings, indicating that the dual-metal Cu/Ni@AF composite delivers outstanding EMI shielding performance. Overall, this method offers a new way to safely modify aramid fibers and paves the way for more sustainable, high-performance shielding materials. © 2025

关键词： Aramid fibers

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On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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Solution-processed,flexible and broadband photodetector based on CsPbBr_(3)/PbSe quantum dot heterostructures

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Journal of materials Science & technology 2021年第9期68卷 216-226页

作者： Jinming Hu Shengyi Yang Zhenheng Zhang Hailong Li Chandrasekar Perumal Veeramalai Muhammad Sulaman Muhammad Imran Saleem Yi Tang Yurong Jiang Libin Tang Bingsuo Zou Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing100081China Key Laboratory of Advanced Optoelectronic Quantum Design and Measurement.Ministry of Education Beijing Institute of Technology.Beijing100081China Kunming Institute of Physics Kunming650223China Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and PhotonicsBeijing Institute of TechnologyBeijing100081China MOE Key Lab of New Processing Technology for Nonferrous Metals and Materials and Guangxi Key Lab of Processing for Nonferrous Metals and Featured Materials School of Physical Science and TechnologyGuangxi UniversityNanning530004China

Due to their promising applications in foldable displays,optical communication equipment and environmental monitoring systems,flexible and broadband optoelectronic devices have gained extensive attention in recent ***,a flexible and broadband photodetector based on CsPbBr_(3)/PbSe quantum dot(QD) heterostructures is firstly *** integrated QD heterostructures possess consecutive detection range from ultraviolet(UV) to long-wave length infrared(LW-IR) regions with efficient light absorption and chemical stability,in comparison with the pristine PbSe *** material characterizations reveal the improved exciton dissociation,carrier transport and carrier lifetime of the QD *** photodetector Ag/CsPbBr_(3)/PbSe/Ag demonstrate a high responsivity of 7.17 A/W with a specific detectivity of 8.97 × 10^(12) Jones under 25 μW/cm^(2) 365 nm illumination at 5 ***,it could maintain 91.2 %(or 94.9 %) of its initial performance even after bending for thousands of times(or exposing in ambient air for 4 weeks).More importantly,its re s ponse time is shortened more than three orders of magnitude as that of pristine PbSe QDs-based ***,it provides a feasible and promising method for the next-generation high-performance broadband photodetectors via constructing heterostructures of various QDs.

关键词： Quantum dots Broadband detection Flexible photodetectors Fast photoresponse speed Heterostructures

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Three-Dimensional Heterostructured Mnnicop/Feooh Cross-Linked Nano-Flake Supported by Ni Foam as a Bifunctional Electrocatalysts for Overall Water Splitting

SSRN

引用

SSRN 2023年

作者： Zhu, Longqi Wang, Runze Liu, Xuehua Yang, Shuhan Liu, Haizhen Xing, Bo Wang, Kuikui Institute of Materials for Energy and Environment Laboratory of New Fiber Materials and Modern Textile Growing Basis for State Key Laboratory College of Materials Science and Engineering Qingdao University Qingdao266071 China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Guangxi Nanning530004 China National Engineering Laboratory of Circular Economy Sichuan University of Science and Engineering Sichuan Zigong643000 China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou University Jiangsu Changzhou213164 China

The production of three-dimensional heterogeneous structures is a vital approach for the creation of high-performance bifunctional electrocatalysts. Herein, three-dimensional heterostructure MnNiCoP/FeOOH (MNC-P/FeOOH) supported by Ni foam was prepared by simple electrodeposition and phosphorylation as a bifunctional electrocatalyst. The results showed that the required overpotential for MNC-P/FeOOH catalyst to reach 100 mA cm-2 current density was 124 mV and 251 mV in 1.0 M KOH solution, respectively. Construction of heterojunction not only improves the OER performance of MnNiCoP, but also reduces the potential required to drive the integral water splitting at 100 mA cm-2 current density. The electrocatalytic activity of MNC-P/FeOOH is greatly increased due to a distinctive interface synergy and strong electronic contacts in the MNC-P/FeOOH heterojunction. This design approach of bifunctional transition metal phosphides provides a potential route to achieve total water splitting. © 2023, The Authors. All rights reserved.

关键词： Heterojunctions

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Facile fabrication of cordierite-based porous ceramics with magnetic properties

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Journal of advanced Ceramics 2022年第10期11卷 1583-1595页

作者： Hao LI Cuiwei LI Huaiming JIA Guangjin CHEN Siyuan LI Kepi CHEN Chang-An WANG Liang QIAO Center of Materials Science and Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China

In this paper,cordierite-based porous ceramics with magnetic properties have been firstly in-situ synthesized by using MgO,Al_(2)O_(3),and SiO_(2) powders as raw materials and Fe_(3)O_(4) as a functional *** with the foam freeze casting method,near net size fabrication(total linear shrinkage<2.86%)of the magnetic porous materials was realized by adjusting the amount of Fe_(3)O_(4).The porosity,compressive strength,and saturation magnetization of the prepared materials were 83.9%-87.8%,1.51-2.65 MPa,and 1.2-5.8 emu/g,*** phase composition and microstructure evolutions during sintering were investigated *** results showed that the synthesis temperature of cordierite was lowered about 100℃ due to the addition of Fe_(3)O_(4).Except for the main phase-cordierite,Mg-Al-Fe spinel and α-Fe_(2)O_(3) also existed in the final *** lattice parameters of the Mg-Al-Fe spinel and the amount of α-Fe_(2)O_(3) changed obviously with the change in the sintering temperature and Fe_(3)O_(4) amount,which mainly influenced the magnetic properties of the prepared ***,a facile fabrication method of the cordierite-based porous ceramics with the magnetic properties has been put forward in this paper.

关键词： porous cordierite ceramics phase composition microstructure magnetic property

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A Janus and Superhydrophilic Design for Stable and Efficient High-Salinity Brine Solar Interfacial Desalination

SSRN

引用

SSRN 2022年

作者： Xiao, Xingfang Pan, Luqi Chen, Bei Chen, Tao Wang, Yingao Zhang, Qian Ren, Lipei Xu, Weilin State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Institute for Frontier Materials Deakin University GeelongVIC3216 Australia

Solar interfacial desalination is a potential pathway for freshwater using solar energy and brine. Many recent advances have been extensively studied to high-efficiency solar steam yield, however, the decrease of evaporation performance resulted from salt accumulation at absorbers inevitably hinder their development, especially in high-salinity brine (>10%). Here, we propose a Janus and superhydrophilic design for efficient and stable solar interfacial desalination in high-salinity brine. The Janus structure of the absorber, which has an upper layer of very light-absorbing (>95%) carbon fiber powder and a bottom layer of insulated aramid fiber powder, allows for efficient thermal management to prevent heat loss and promote efficient water evaporation. Furthermore, the impact of carboxylate cellulose ensures that the absorber with an ultra-high-water content. Therefore, the Janus and superhydrophilic design can realize an evaporation rate as high as 1.25 kg m −2 h −1 with a salinity of 15 wt% brine under 1-sun illumination and achieve salt resistance in outdoor conditions for a long time. Therefore, this technique simply integrates outdated fiber powder with the current solar interfacial evaporators and establishes a new paradigm for very effective and reliable high-salinity brine treatment. © 2022, The Authors. All rights reserved.

关键词： Evaporation

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Magnetic polaronic exciton in A-type 2D van der Waals bulk material CrSBr

arXiv

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arXiv 2024年

作者： Shen, Xiaodong Cao, Jiajun Liang, Weizheng Cong, Borong Ke, Bao Zhao, Jialong Zou, Bingsuo State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Physical Science and Technology School of Resources Environment and Materials Guangxi University Nanning530004 China

2D magnetic semiconductor CrSBr exhibits unique magneto-optical properties, yet its electronic structure and photophysical mechanisms remain unclear at high magnetic field and low temperature. Through comprehensive spectroscopic investigations, its charge-transfer band edge is identified at 500 nm. Below this band-edge, local excitonic magnetic polaronic states from Cr3+ ions out of FM aggregates in layer and bilayer could be seen due to phonon-spin-exciton coupling, in which magnetic polaronic PL1 emission occurs at 720 nm from single Cr3+ d-d transition, a dark-state pair exciton occurs at 850 nm in 10 K magnetic field, and double-peak PL2 emission at 920 nm out of Cr3+ FM trimer in monolayer is seen;besides, the magnetic bi-polaronic PL3 at 990 nm can be assigned to Cr3+ tetramers between FM adjacent layers. In magnetic field perpendicular to the layer, direct competition between PL1/dark-state excitons and PL2/PL3 excitonic states persist in different temperatures. This study sheds light on the complicated magneto-exciton interactions in the multi-body effect of CrSBr, beneficial for quantum modulation in layered magnetic semiconductors. © 2024, CC BY-NC-ND.

关键词： Van der Waals forces

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A Single-Layer Piezoelectric Composite Separator for Durable Operation of Li Metal Anode at High Rates

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Energy & Environmental materials 2024年第1期7卷 265-274页

作者： Yuanpeng Ji Botao Yuan Jiawei Zhang Zhezhi Liu Shijie Zhong Jipeng Liu Yuanpeng Liu Mengqiu Yang Changguo Wang Chunhui Yang Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150080China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Piezoelectric ceramic and polymeric separators have been proposed to effectively regulate Li deposition and suppress dendrite growth,but such separators still fail to satisfactorily support durable operation of lithium metal batteries owing to the fragile ceramic layer or low-piezoelectricity polymer as ***,by combining PVDF-HFP and ferroelectric BaTiO_(3),we develop a homogeneous,single-layer composite separator with strong piezoelectric effects to inhibit dendrite growth while maintaining high mechanical *** squeezed by local protrusion,the polarized PVDF-HFP/BaTiO_(3)composite separator generates a local voltage to suppress the local-intensified electric field and further deconcentrate regional lithium-ion flux to retard lithium deposition on the protrusion,hence enabling a smoother and more compact lithium deposition morphology than the unpoled composite separator and the pure PVDF-HFP separator,especially at high ***,the homogeneous incorporation of BaTiO_(3)highly improves the piezoelectric performances of the separator with residual polarization of 0.086 pC cm^(-2)after polarization treatment,four times that of the pure PVDF-HFP separator,and simultaneously increases the transference number of lithium-ion from 0.45 to *** from the prominent piezoelectric mechanism,the polarized PVDF-HFP/BaTiO_(3)composite separator enables stable cyclic performances of Li||LiFePO_(4)cells for 400 cycles at 2 C(1 C=170 mA g^(-1))with a capacity retention above 99%,and for 600 cycles at 5 C with a capacity retention over 85%.

关键词： composite separator Li metal anodes piezoelectric materials PVDF-HFP uniform Li deposition

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Optimizing Mechanical Stretchability and Photovoltaic Performance in All-Polymer Solar Cells from a Two‐Donor Polymer Blend

SSRN

引用

SSRN 2023年

作者： Li, Mingfei Xian, Kaihu Zhao, Wenchao Sheng, Dan Liu, Chunhui Li, Xin Li, Weiwei Ye, Long Tianjin300350 China Co-Innovation Center of Efficient Processing Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Hubei Longzhong Laboratory Xiangyang441000 China

In recent years, the power conversion efficiency (PCE) of all-polymer organic solar cells (OSCs) has surpassed 18%, reaching a level suitable for commercial applications. To meet the dual requirements of high efficiency and high stretchability for flexible wearable applications, ternary blending strategies have been widely used to improve the stretchability of all-polymer OSCs. However, up to now, achieving synergistic optimization of both photovoltaic and mechanical properties has not been ideal. Here, we introduce a long-branched alkyl chain-containing PM6-like donor polymer, PM6-OD, into a PM6:PY-IT blend to address this issue. When the content of PM6-OD in the donor polymers is 20%, both the photovoltaic and mechanical properties of the ternary solar cell are improved. The variation of the mechanical and photovoltaic properties with the PM6-OD content in the donor was analyzed through grazing-incidence X-ray scattering and mechanical measurements to gain a deeper understanding of the intrinsic relationship between film structure and mechanical properties. In addition, the data points of elastic moduli match well with the Kerner-Davis model. This work provides new guidance for the construction of high-efficiency, stretchable OSCs and has a promoting effect on the application of organic photovoltaic cells in the field of wearable/stretchable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Organic solar cells

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Dislocation Evolution in Pure Aluminum Subjected to Ultrasonic Vibration-Assisted Uniaxial Compression

SSRN

引用

SSRN 2023年

作者： Shi, Junru Zhang, Mao Li, Qiaomin Cai, Hongjun Zhang, Jiacheng Deng, Lei Wang, Xinyun Jin, Junsong Gong, Pan Tang, Xuefeng State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Digital Textile Equipment School of Mechanical Engineering and Automation Wuhan Textile University Wuhan430073 China

Revealing the influence of ultrasonic vibration on the dislocation evolution is the key to understanding its role in plastic deformation. In this paper, based on experiments and molecular dynamics simulations, ultrasonic vibration was periodically superimposed during the uniaxial compression of pure aluminum. The changes in average grain size, texture, and dislocation density under different vibration amplitudes were analyzed, and the mechanism of ultrasonic vibration altering the dislocation evolution was discussed. The results showed that when the ultrasonic amplitude is small, dislocation multiplication plays the dominant role, while with larger amplitudes, dislocation annihilation prevails, and the dislocation density comes to its peak at an earlier strain stage. Superimposing ultrasonic vibration increases the atomic kinetic energy, promotes dislocation generation and movement, induces subgrain rotation, reduces texture intensity, weakens the preferred orientation of deformed grains, and refines the grains. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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