A green fabrication and variable temperature electromagnetic properties for thermal stable microwave absorption towards flower-like Co3O4@rGO/SiO2 composites

By Junru Ma, Jincheng Shu, W. Cao, Min Zhang, Xi-Xi Wang, Jie Yuan, M. Cao. Composites Part B: Engineering, 2019

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Abstract High efficiency and thermal stability are two key factors of ideal electromagnetic attenuation materials, which are becoming desired owing to more complex modern service environment. Herein, a new type of high-temperature microwave absorber, flower-like Co3O4@rGO/SiO2 composite is synthesized by a generic and green fabrication route. It possesses stable microwave absorption (MA) performance in the temperature range from 353 K to 473 K. Particularly, the optimal reflection loss (RL) reaches −52.6 dB with thickness of 1.78 mm at the temperature of 353 K, and maximum bandwidth (RL ≤ −10 dB) of samples can cover the entire X-band (8.2–12.4 GHz) at the thickness of ∼2.00 mm. The excellent high-temperature MA performance can be ascribed to the synergistic effect of the introduced magnetic loss and conduction loss, as well as the multiple polarizations loss of three-dimensional (3D) hierarchical structures. Our work confirms that 3D hierarchical Co3O4@rGO/SiO2 sample can provide a novel pathway for designing high-temperature microwave absorbers in the future.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/7f133d92f69cca407c09a9d5691865d7b20e5bd7