Multifunctional FeCo@SiO_(2)/PPy-Ag/PDMS composite films with efficient electromagnetic wave absorption,favorable hydrophobicity and UV protection propertiesOA

Electromagnetic wave(EMW)absorbers are always needed to be qualified with environmental adaptability and long-term stability when applied in harsh environments with strong ultraviolet(UV)radiation,high humidity,or in high-altitude environments with variable climates.Typically,hydrophobicity and UV protection are needed for some special equipment.Herein,a flexible EMW absorbing film composed of polydimethylsiloxane(PDMS),FeCo@SiO_(2)nanoparticles and polypyrrole(PPy)-Ag composite with hydrophobicity and ultraviolet protection properties is designed and prepared.Benefiting from the magneto-dielectric synergistic effect and multi-layered heterogeneous interfaces,the synthesized FeCo@SiO_(2)/PPy-Ag/PDMS(FSPA/PDMS)composite film exhibits excellent EMW absorption capabilities.The minimum reflection loss(RLmin)of-29.8 dB and the maximum effective absorption bandwidth(EAB)of 5.8 GHz with a thin matching thickness(1.77 mm)can be obtained.Furthermore,the FSPA/PDMS composite film demonstrates favorable hydrophobicity with a water contact angle of 128.6°and exceptional UV protection performance with an ultraviolet protection factor(UPF)value as high as 143.46.Moreover,the 180 mm×180 mm carbonyl iron powder(CIP)@SiO_(2)/PPy-Ag/PDMS composite film is fabricated and measured using the arch method,both before and after an accelerated UV aging experiment,demonstrating excellent EMW absorption capabilities and remarkable UV aging resistance.This work provides a new strategy for achieving efficient EMW absorption with a thin matching thickness,alongside favorable hydrophobicity,excellent UV shielding and UV aging resistance.We believe this work holds great potential for practical applications such as aircraft,camouflage tents and protective clothing in harsh environments.