Abstract
As the rapid development of electronic devices and wireless communication tools, it is urgent to design and fabricate low-cost, lightweight and effective electromagnetic absorption materials to solve electromagnetic interference of electromagnetic waves. Herein, a facile pre-modification method was employed to design alginate-based Fe@SAC composite absorbers. The core-shell structure could increase the crystallinity of carbon, contributing to a high dielectric loss capacity. The multiple interface polarization effect induced by this structure enhanced the interaction between electromagnetic waves and absorbers, thus accomplished a better wave absorbing effect. Besides, the eddy effect of magnetic particles can also be avoided to realize the impedance matching. Fe@SAC achieved the strongest loss to electromagnetic waves at 9.76 GHz, with the minimum reflection loss up to −41.59 dB. The effective absorption bandwidth reached 2.80 GHz (11.28–14.08 GHz) with a matching thickness merely of 1.5 mm. This efficient, simple and green strategy provides new ideas and development directions for the design of electromagnetic wave absorbers.
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