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3D Printing of Periodic Porous Metamaterials for tunable electromagnetic shielding Across Broad Frequencies

Nano-Micro Letters 2024年第12期16卷 533-552页

作者： Qinniu Lv Zilin Peng Haoran Pei Xinxing Zhang Yinghong Chen Huarong Zhang Xu Zhu Shulong Wu State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityNo.24 South Section 1Yihuan RoadChengdu 610065People’s Republic of China Baosheng Technology Innovation Corporation Limited No.1Suzhong RoadBaoying CountyYangzhou 225800People’s Republic of China

The new-generation electronic components require a balance between electromagnetic interference shielding efficiency and open structure factors such as ventilation and heat *** addition,realizing the tunable shielding of porous shields over a wide range of wavelengths is even more *** this study,the well-prepared thermoplastic polyurethane/carbon nanotubes composites were used to fabricate the novel periodic porous flexible metamaterials using fused deposition modeling 3D ***,the investigation focuses on optimization of pore geometry,size,dislocation configuration and material thickness,thus establishing a clear correlation between structural parameters and shielding *** experimental and simulation results have validated the superior shielding performance of hexagon derived honeycomb structure over other designs,and proposed the failure shielding size(D_(f)≈λ/8-λ/5)and critical inclined angle(θf≈43°-48°),which could be used as new benchmarks for tunable electromagnetic *** addition,the proper regulation of the material thickness could remarkably enhance the maximum shielding capability(85-95 dB)and absorption coefficient A(over 0.83).The final innovative design of the porous shielding box also exhibits good shielding effectiveness across a broad frequency range(over 2.4 GHz),opening up novel pathways for individualized and diversified shielding solutions.

关键词： Polymeric component 3D printing tunable electromagnetic shielding Periodic porous metamaterials Honeycomb pore structure

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Biomass-based aligned carbon networks with double-layer construction for tunable electromagnetic shielding with ultra-low reflectivity

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Journal of Materials Science & Technology 2022年第8期103卷 98-104页

作者： Jiali Chen Da Yi Xichen Jia Guoqing Wang Zhouping Sun Lihua Zhang Yinfeng Liu Bin Shen Wenge Zheng School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Ningbo Key Lab of Polymer Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

Nowadays,carbon frameworks derived from natural biomaterials have attracted extensive attention for electromagnetic interference(EMI)shielding due to their renewability and ***,it is critical and challenging to achieve effective regulation of shielding effectiveness(SE)as well as weaken the strong EM reflection of highly conductive biomass-based carbon ***,commercial cotton pads with oriented structure were selected as carbonaceous precursor to fabricate aligned carbon networks by pyrolysis,and the EMI SE of the samples with increased temperature of 800-1000℃ can be accurately controlled in the effective range of~21.7-29.1,~27.7-37.1 and~32.7-43.3 d B with high reflection coefficient of>0.8 by changing the cross-angle between the electric-field direction of incident EM waves and the fiber-orientation direction due to the occurrence of opposite internal electric ***,the further construction of Salisbury absorber-liked double-layer structure could result in an ultralow reflection coefficient of only~0.06 but enhanced SE variation range up to~38.7-49.3 d B during the adjustment of cross-angle,possibly due to the destructive interference of EM waves in the double-layer carbon *** work would provide a simple and effective way for constructing high-performance biomass carbon materials with adjustable EMI shielding and ultra-low reflectivity.

关键词： Aligned carbon networks Double-layer construction tunable electromagnetic shielding Ultra-low reflectivity

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