Corrosion-resistant electromagnetic shielding materials with high conductivity and excellent magnetic properties are urgently needed to resolve the issue of electromagnetic radiation pollution. Herein, the renewable and easily degradable cellulose paper after tannin-assisted silver-nanoparticle deposition was designed as the substrate. An electroless copper-plated paper (ECP) with a high conductivity of 4167 s/cm and a low sheet resistance of 5.17 mΩ/sq was used as a conductive layer. The superhydrophobic magnetic surface with a contact angle of 153.5°and a sliding angle of 3.2°was prepared by spraying a mixture of polydimethylsiloxane and clustered Fe 3 O 4 microspheres synthesized by a one-step hydrothermal method. Fe 3 O 4 microspheres were used to construct the surface micro−nano hierarchical structure and improve the impedance matching, and polydimethylsiloxane was used to provide a low surface energy and facilitate the adhesion of ECP to clustered Fe 3 O 4 microspheres. The synergistic effect of the conductive and magnetic layers resulted in the cellulose paper, showing absorption-dominated electromagnetic shielding characteristics with electromagnetic interference shielding effectiveness >50 dB (absorption: reflection ∼95:5). The study provides a promising method for preparing wave-absorbing-based shielding materials with a wide application.

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The functional design of paper-based material surfaces with renewable functions and environmentally friendly properties is prevalent nowadays. Herein, a superhydrophobic surface with a coral reef-like structure was prepared on filter paper by electroless copper plating, rapid silver nitrate etching, and facile 1-hexadecanethiol impregnation. After low-surface-energy thiol treatment, this unique coral reef-like structure surface showed excellent superhydrophobicity with a water contact angle of 163.8° and superoleophobicity with an oil contact angle of 0°, which could be used for oil–water separation and had a separation efficiency above 89.17% after 12 consecutive oil–water separations. Because the copper layer and silver nanostructure are both excellent conductive materials, the modified paper exhibited excellent electromagnetic shielding properties, and the electromagnetic interface shielding effectiveness exceeded 63 dB from 9 kHz to 1.5 GHz. The modified paper also had excellent self-cleaning properties and a better corrosion resistance. The unique three-dimensional interweaving structure between the cellulose fibers in the filter paper is fully utilized, and the substitution reaction between the silver ion and the copper coating produces a coral reef-like structure, which provides a new strategy for promoting the wide application of paper-based materials.