Porifera-Inspired Lightweight, Thin, Wrinkle-Resistance, And Multifunctional MXene Foam.

Transition metal carbides/nitrides (MXenes) demonstrate a massive potential in constructing lightweight, multifunctional wearable electromagnetic interference (EMI) shields for application in various fields. Nevertheless, it remains challenging to develop a facile, scalable approach to preparing the MXene-based macrostructures characterized by low density, low thickness, high mechanical flexibility, and high EMI SE at the same time. Herein, the ultrathin MXene/reduced graphene oxide (rGO)/Ag foams with a porifera-inspired hierarchically porous microstructure are prepared by combining Zn 2+ diffusion induction and hard template methods. The hierarchical porosity, which includes a mesoporous skeleton and a microporous MXene network within the skeleton, not only exerts a regulatory effect on stress distribution during compression, making the foams rubber-like resistant to wrinkling, but also provides more channels for multiple reflections of electromagnetic waves. Due to the interaction between Ag nanosheets, MXene/rGO, and porous structure, it is possible to produce an outstanding EMI shielding performance with the specific surface shielding effectiveness reaching 109152.4 dB·cm 2 ·g -1 . Furthermore, the foams exhibit multifunctionality, such as transverse Joule heating, longitudinal heat insulation, self-cleaning, fire-resistance, and motion detection. These discoveries open up a novel pathway for the develop of lightweight MXene-based materials with considerable application potential in wearable electromagnetic anti-interference devices. This article is protected by copyright. All rights reserved.