Methylene blue adsorption derived thermal insulating N, S-co-doped TiC/carbon hybrid aerogel for high-efficient absorption-dominant electromagnetic interference shielding

Abstract

The development of absorption-dominant electromagnetic interference (EMI) shielding materials with high-efficiency EMI shielding effectiveness (SE) and low reflection (R) is crucial but challenging for next-generation electronics devices and telecommunication. In this regard, a facile and environmentally friendly approach was proposed to fabricate N, S-co-doped TiC/carbon hybrid aerogels with hierarchically porous architecture through MXene/cellulose hybrid hydrogels as precursors for adsorbing dyes, followed by freeze drying and carbonization process. Profiting from the synergistic effect of highly interconnected three-dimensional (3D) porous structure, heterogeneous conductive network with greatly conductive difference as well as heteroatoms-doping induced dipole polarization, the resultant aerogel with an ultra-low density (47.1 mg/cm3) achieves a highly efficient EMI SE of 84.3 dB at 12.4 GHz (average 81.8 dB in the X-band) and a superior absorption coefficient of 0.68 simultaneously. Meanwhile, the highly porous structure endows the prepared aerogels with outstanding thermal insulating capacity, which is essential to provide infrared stealth and radar stealth for military equipment and to protect sensitive electronic devices from high-temperature attacks. This work offers a prospective strategy for constructing high-performance absorption-dominated EMI shielding materials with excellent thermal insulation properties, and the obtained aerogels present broad application prospects in the fields of aviation, portable electronic equipment and national defense industry.