Abstract
In this paper, ZnFe2O4@Zeolitic imidazolate framework-8 (ZIF-8) composites were prepared by Sol-Gel self-propagating combustion method and in situ growth method. Honeycomb-like structured ZnFe2O4@C composites were obtained using ZnFe2O4@ZIF-8 as the precursor in Ar atmosphere carbonization at 800℃. The honeycomb-like structure is conducive to enhance the polarization and reflection on the surface of powder particles, which ameliorate the EMW absorption properties of the materials significantly. Wherein, the carbon content can be controlled by ZIF-8 coating. The composite with 5% ZIF-8 (wt%) shows excellent reflection loss value of −36.5 dB at 9.4 GHz with a matching thickness of 2.0 mm, and the corresponding effective absorption bandwidth is 3.5 GHz (7.6–11.1 GHz). The composite with 10% ZIF-8 (wt%) obtain a minimum reflection loss value of −37.8 dB at 10.0 GHz when the thickness is 2.0 mm, and the effective absorption bandwidth is 3.5 GHz (7.9–11.3 GHz).
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