【摘 要】
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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 nanocomposite
【机 构】
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Department of Mechanical and Industrial Engineering,University of Toronto,5 King’s College Road,Toro
论文部分内容阅读
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.
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