Toward high performance microwave absorber by implanting La0.8CoO3 nanoparticles on rGO

The advent of "intelligent era" brings our life more convenience, but the electromagnetic radiation surrounding us not only greatly threatens human health, also makes information leakage and hidden trouble to national defense security. Hence, it is very urgent to develop novel electromagnetic wave absorption materials with lightweight, strong absorption, tunable absorption frequency and broad band absorption. Herein, a novel electromagnetic wave absorber is obtained by constructing La0.8CoO3-rGO nanocomposite, where La0.8CoO3 nanoparticles are anchored on graphene nanosheets by the electrostatic interaction between GO and La0.8CoO3. The effect of hybridization ratio of La0.8CoO3 and rGO on microwave absorption properties is carefully studied. The optimal reflection loss of La0.8CoO3-rGO nanocomposite can reach-62.34 dB with the maximum effective bandwidth of 6.08 GHz, presenting 48.78% and 245.45% increment compared to bare La0.8CoO3 nanoparticles, respectively. The effective absorption bandwidth covers a broad electromagnetic wave absorption band from Ku band to the C band by tailoring thickness of the absorbers from 2.4 mm to 4.4 mm. The fascinating electromagnetic wave absorption performance is attributed to the synergy effect of La0.8CoO3 and rGO, which integrates magnetic and dielectric loss caused by resonance, conductance, relaxation, and scattering loss. This result confirms that La0.8CoO3- rGO nanocomposite is potential candidates toward high-efficiency microwave absorbers and provides a valuable pathway for designing high-performance microwave attenuation materials in the future.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.