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Rational construction of hierarchical [email protected]@NPC nanocomposites derived from bimetallic hybrid ZIFs/biomass for boosting the microwave absorption

, Xiaochuang Di, Zhao Lu, Xinming Wu
Journal of Colloid and Interface Science , Volume 589, pp 462-471; doi:10.1016/j.jcis.2021.01.013

Abstract: Nowadays, electromagnetic (EM) radiation poses severe environmental pollution and harm to civilian and military life. To this end, it is urgent to synthesize high-efficiency microwave absorbers in terms of composition and structural design. Herein, we reported a unique hybrid nanostructure with Co particles embedded in hollow carbon polyhedron by a series of synthetic steps including carbonization and pyrolysis. Further, the nanoporous carbon (NPC) derived from wheat flour is coated onto the surface of [email protected] polyhedrons, forming a special hierarchical structure ([email protected]@NPC), which demonstrates outstanding microwave absorption properties due to the hierarchical porous structure, enhanced interfacial polarization, conduction loss, multi-reflection and matched impedance. Typically, with a 10 wt% filler content, the maximum RL of [email protected]@NPC reaches −57.2 dB at 9.6 GHz and the corresponding effective bandwidth is 5.7 GHz (from 7.5 to 13.2 GHz) with an absorber thickness of 3 mm. Besides, the filler loading of 10 wt% is much lower than other reported bio-derived absorbers. In short, the hybrid zeolitic imidazolate frameworks offer a novel idea for constructing hollow carbon skeletons and introducing biomass carbon as a green, low cost and renewable material that enhances the dielectric loss and the synergistic effect between permittivity and permeability.
Keywords: Nanocomposites / Metal-organic frameworks (MOFs) / Interfacial polarization / Microwave absorption performance

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