Lightweight,high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for address-ing the challenge of ever-increasing electromagnetic pollution.Lightweight lay-ered foam/film PVDF nanocomposites with efficient EMI shielding effectiveness and ultralow reflection power were fabricated by physical foaming.The unique layered foam/film structure was composed of PVDF/SiCnw/MXene (Ti3C2Tx)composite foam as absorption layer and highly conductive PVDF/MWCNT/GnPs composite film as a reflection layer.The foam layer with numerous het-erogeneous interfaces developed between the SiC nanowires (SiCnw) and 2D MXene nanosheets imparted superior EM wave attenuation capability.Further-more,the microcellular structure effectively tuned the impedance matching and prolonged the wave propagating path by internal scattering and multiple reflec-tions.Meanwhile,the highly conductive PVDF/MWCNT/GnPs composite (～220 S m-1) exhibited superior reflectivity (R) of 0.95.The tailored structure in the layered foam/film PVDF nanocomposite exhibited an EMI SE of 32.6 dB and a low reflection bandwidth of 4 GHz (R ＜ 0.1) over the Ku-band (12.4-18.0 GHz) at a thickness of 1.95 mm.A peak SER of 3.1 × 10-4 dB was obtained which corresponds to only 0.0022％ reflectionefficiency.In consequence,this study introduces a feasible approach to develop lightweight,high-efficiency EMI shielding materials with ultralow reflection for emerging applications.

Li Ma;Mahdi Hamidinejad;Biao Zhao;Caiyun Liang;Chul B.Park

Department of Mechanical and Industrial Engineering,University of Toronto,5 King's College Road,Toronto,ON M5S 3G8,Canada;Institute for Manufacturing,Department of Engineering,University of Cambridge,Cambridge CB30FS,UK;Laboratory of Advanced Materials,Department of Materials Science,Collaborative Innovation Center of Chemistry for Energy Materials,Fudan University,Shanghai 200438,People's Republic of China;Henan Key Laboratory of Aeronautical Materials and Application Technology,School of Material Science and Engineering,Zhengzhou University of Aeronautics,Zhengzhou,Henan 450046,People's Republic of China;CAS Key Laboratory of High-Performance Synthetic Rubber and Its Composite Materials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,People's Republic of China

纳微快报（英文）

[1]Li Ma;Mahdi Hamidinejad;Biao Zhao;Caiyun Liang;Chul B.Park-.Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection)[J].纳微快报（英文）,2022(01):307-324

microcellular,reflectionefficiency

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