Near‑Instantaneously Self‑Healing Coating toward Stable and Durable Electromagnetic Interference Shielding

Durable electromagnetic interference(EMI)shielding is highly desired,as electromagnetic pollution is a great concern for electronics’stable performance and human health.Although a superhydrophobic surface can extend the service lifespan of EMI shielding materials,degradation of its protection capability and insufficient self-healing are troublesome issues due to unavoidable physical/chemical damages under long-term application conditions.Here,we report,for the first time,an instantaneously self-healing approach via microwave heating to achieve durable shielding performance.First,a hydrophobic 1H,1H,2H,2H-perfluorooctyltriethoxysilane(POTS)layer was coated on a polypyrrole(PPy)-modified fabric(PPy@POTS),enabling protection against the invasion of water,salt solution,and corrosive acidic and basic solutions.Moreover,after being damaged,the POTS layer can,for the first time,be instantaneously self-healed via microwave heating for a very short time,i.e.,4 s,benefiting from the intense thermal energy generated by PPy under electromagnetic wave radiation.This self-healing ability is also repeatable even after intentionally severe plasma etching,which highlights the great potential to achieve robust and durable EMI shielding applications.Significantly,this approach can be extended to other EMI shielding materials where heat is a triggering stimulus for healing thin protection layers.We envision that this work could provide insights into fabricating EMI shielding materials with durable performance for portable and wearable devices,as well as for human health care.

Antioxidative MXene@GA‑Decorated Textile Assisted by Metal Ion for Efficient Electromagnetic Interference Shielding,Dual‑Driven Heating,and Infrared Thermal Camouflage

Two-dimensional transition metal carbide/nitride(MXene)-based textiles have been developed in many fields;however,the high sensitivity to oxidation and weak interfacial bonding hinder their applications.Herein,we present a strategy for the preparation of a highly antioxidative MXene@gallic acid(MXene@GA,MG)hybrid dispersion,and further covalently grafted it onto carboxylated cotton fabric through interaction with metal ions(Fe^(3+))for fabricating wearable multifunctional textiles.Due to the cross-linking effect of Fe^(3+)and the remarkable antioxidant activity of natural polyphenol GA,the MG coatings firmly adhere to the textile surfaces and can withstand conventional washing,exhibiting favorable service stability and potential application prospects.Moreover,the obtained MG-decorated textile has the inherent characteristics of good breathability,moisture permeability,flexibility,and biocompatibility of the original fabric,which are conducive to the wearability of smart devices.Furthermore,by utilizing the outstanding conductivity(~330 S/m)and photothermal convertibility of the MG coating,the functional textile achieves high electromagnetic interference(EMI)shielding efficiency(~35 dB),excellent dual-driven(Joule and solar)heating warmth retention,and infrared thermal camouflage.Due to the green and scalable preparation process,favorable durability,excellent comfort,and multifunctionality,the MG-decorated textiles are anticipated to be promising candidates for the next generation of smart wearable personal protective clothing.