absorption

shielding

optical coherence

japan

electromagnetic wave

new venture

wave absorption

polymorphisms_128194

ghz_72998

electromagnetic wave absorption

eavesdroppers

libraries_89073

microbiome_99192

mwnt

listeria_8903

composites_97216

composites made

strategies suggested

electromagnetic wave absorbing

Journal of Colloid and Interface Science

Ultra-thin microwave absorbers have been urgently demanded for electromagnetic applications in recent years. Herein, porous carbon with a “flower cluster” microstructure was synthesized from biomass waste (mango seeds) by a facile activation and carbonization method. The novel structure reduced the density and also improved the impedance matching, dipole polarization, and provided many carbon matrix-air interfaces for interfacial polarization, resulting in superior microwave absorption performance. At an ultra-thin thickness of 1.5 mm, extraordinary microwave absorption was achieved, with a reflection loss (RL) of −42 dB. The effective absorption bandwidth reached 4.2 GHz. The RL can be further improved to −68.4 dB by adjusting the amount of activator to manipulate the structure of porous carbon. In addition, from the simulated radar scattering results, the maximum reduction in the radar cross-section (RCS) reached 30.4 dBm 2 , which can greatly reduce the probability of equipment being detected by radar. This work provides a low-cost and high-performance microwave absorber for electromagnetic stealth technologies.

Enhanced interfacial polarization of biomass-derived porous carbon with a low radar cross-section