请联系产品经理（V 13689651620 索取原文（�/span>

Double-layered absorption-dominated electromagnetic interference (EMI)shielding composites are highly desirable to prevent secondary electromagneticwave pollution. However, it is a tremendous challenge to optimize the shieldingperformance via the trial-and-error method due to the low efficiency. Herein,a novel approach of computation-aided experimental design is proposedto efficiently optimize the reflectivity of the double-layered composites.A normalized input impedance (NII) method is presented to calculate theelectromagnetic wave reflectivity of multilayered EMI shielding composites. Thecalculated results are a good match with the experimental results. Then, the NIImethod is utilized to design polyvinylidene difluoride/MXene/carbon nanotube(PVDF/MXene/CNT) composites. According to the optimization of the NIImethod, the prepared PVDF/MXene/CNT composite has an ultralow reflectivityof 0.000057, which outperforms that reported in current work and satisfiesthe requirement of electromagnetic wave absorbing material. Additionally, itsaverage EMI shielding effectiveness is 30 dB, demonstrating that PVDF/MXene/CNT composite simultaneously achieves shielding and absorption. The ultralowreflection mechanism can be ascribed to the ideal impedance match. Both thePVDF/MXene and the PVDF/CNT layers can attenuate electromagnetic energy,which subverts the traditional cognition of double-layered absorption-dominatedEMI shielding composites. The NII method opens a way for the practicalfabrication of double-layered absorption-dominated EMI shielding composites.