Abstract
The magnetic–dielectric composites with synergetic magnetic and dielectric losses have exhibited great potential in the practical applications of microwave absorbing material. This paper reports a simple low-temperature in situ hydrothermal approach for synthesizing novel composites composed of the dielectric Ti3SiC2 wrapped with magnetic CoNi nanoparticles. The microstructure, morphology, electromagnetic properties, and microwave absorption performance of as-synthesized samples were investigated. By adjusting the content of formed magnetic CoNi nanoparticles on the surface of Ti3SiC2, obvious regulated frequency-dependence of electromagnetic parameters for the proposed CoNi/Ti3SiC2 composites can be realized. Consequently, the effective absorption bandwidth (RL < −10 dB) and optimal reflection loss value of CoNi/Ti3SiC2-40 composites under thinner thickness of 1.55 mm can reach up to 4.88 GHz and −41.41 dB, respectively. Exceptional microwave absorption performance of the CoNi/Ti3SiC2 composites is attributed to its simultaneously improved attenuation characteristics and optimized impedance matching, and thus can be undoubtedly identified as high-efficiency microwave absorbing material.
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