Abstract
Carbon-based composites derived from metal organic frameworks (MOFs) have attracted much interest for microwave absorption. However, most studies only focus on the influence of heating temperature rather than the composition of derivatives on microwave absorption ability. In this work, four kinds of derivatives are obtained from Prussian blue analogue (PBA) after heating treatment. It is found that the annealing atmosphere has a significant influence on material compositions, thus the electromagnetic (EM) parameters and carbon graphitization degree are tuned. As a result, the CoFe/Carbon (CoFe/C) composite was derived from CoFe-PBA precursor with Ar atmosphere, which reached minimum reflection loss (RLmin) value of −44.6 dB and effective absorption bandwidth (fe, the RL value less than −10 dB) of 5.5 GHz at 2.15 mm. For the NiFe/Carbon (NiFe/C) composite, the RLmin of −41 dB and fe of 4.8 GHz can be obtained at the thickness of 1.65 mm. The optimal fe of 6.0 GHz is obtained when the matching thickness was 2.0 mm. Given the lightweight, ultrathin, strong microwave attenuation capability, as well as broad effective absorption bandwidth, these carbon-based composites derived from PBA precursors are promising for practical applications.
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