Synergistic Effect of MOF@CMC-Derived Magnetic Nanocomposites: Enhancing Electromagnetic Interference Shielding and Joule Heating AITranslate

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Emerging as attractive alternatives for sustainable, low-cost, and high-performance electromagnetic interference (EMI) shielding, biomass-derived carbon is nonetheless constrained by a limited repertoire of shielding mechanisms. Herein, a straightforward method was employed to synthesize self-supporting Co nanoparticles embedded in porous N-doped carbon (Co@PNC) composite, which is derived from a film of Co-MOF and sodium carboxymethyl cellulose (Co-MOF@CMC). Benefiting from the synergistic effects between the three-dimensional conductive network formed by porous N-doped carbon and the embedded Co nanoparticles, the Co@PNC composite incorporates abundant heterogeneous interfaces, which collectively enhance both dielectric loss and magnetic losses. Among them, the Co@PNC-3 composite exhibited an exceptional average EMI shielding effectiveness (SE) of 63.5 dB in the X-band at a thickness of 1.2 mm, effectively attenuating 99.99996% of the incident electromagnetic waves. Additionally, it possesses a low density (0.199 g cm−3), with a specific EMI shielding effectiveness value as high as 2496.1 dB cm2 g−1. Meanwhile, the Co@PNC-3 composite demonstrated efficient electro-thermal conversion capabilities, rapidly reaching 158.5°C under a low driving voltage of 4 V, along with excellent flame-retardant properties. This study provides a simple, green, and feasible strategy for the preparation of cellulose-derived composites with high EMI shielding effectiveness and multifunctional properties.