Carbonaceous photonic crystals prepared by high-temperature/hydrothermal carbonization as high-performance microwave absorbers
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Carbonaceous photonic crystals (CPCs) were prepared from peacock feather fibers (PFF) via high-temperature carbonization (HTC) and hydrothermal carbonization (HC), and by comparing the optical reflection microphotographs, the CPCs-HTC and CPCs-HC still owned the structural coloration as the natural PFF. Raman results showed that the ID/IG value of CPCs-HTC was higher than the one of CPCs-HC, demonstrating more defects and higher graphitization degree of CPCs-HTC. Due to the presence of defects and the different degrees of graphitization, complex permittivity of CPCs can be controlled. The microwave absorption performance of 30 wt% CPCs-HTC was better than the CPCs-HC. The minimum reflection loss (RL) of CPCs-HTC was − 57.9 dB when the frequency was 7.3 GHz and the thickness was 2.5 mm. The frequency range, in which the RL values were less than − 10 dB, was 6.4–8.5 GHz. Compared with other biomass-derived materials, the CPCs-HTC shows several advantages, such as the specific photonic structure, simple preparation process and excellent microwave absorption performances. Thus, CPCs-HTC has the potential to be a lightweight microwave absorption material.
This work is supported by the National Natural Science Foundation of China (Nos. 51571172, 51801175, 51732010), Natural Science Foundation of Hebei Province (Nos. E2018203380, E2019203233), Program Foundation for Returned Scholars of Hebei Province (No. C201828).
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