Ultralight, compressible and superhydrophobic hybrid foam with highly efficient electromagnetic interference shielding in damping and high humidity environment

To expand the application range of electromagnetic interference (EMI) shielding materials, it has become an urgent issue to achieve the excellent shielding effectiveness (SE) in extreme environment. In this paper, an ultralight, compressible and superhydrophobic foam composed of melamine foam (MF), Ti 3 C 2 T x MXene and polydimethylsiloxane (PDMS) was constructed via the facile dipping and vacuum-assisted impregnation method. The MF as a skeleton can provide coated substrate for MXene sheets to realize the 3D conductive network. Meanwhile, the PDMS layer of MF/MXene/PDMS (MFMP) foam can enhance the stability and durability of its structure and capability. The obtained MFMP foam possesses the very low reduction (less than 10%) of compressive stress at a high strain of 60% after 200th compression cycles. More importantly, the MFMP foam also shows an ultrahigh absolute SE of 29088 dB cm 2 g −1 due to its excellent SE of 44.66 dB and ultralow density of 9.22 mg cm −3 . The retention rate of SE can be maintained over 85% under the different treatment of serve environment. This strategy offers a promising idea to construct the ultralight porous materials for highly efficient EMI shielding applications in damping and high humidity environment.