Abstract
We report the microwave absorption properties of a composite system comprising of core-shell structured Ni@C nanocapsules, defective onion-like carbon nanoparticles and NbC nanoparticles. Compared with Ni@C nanocapsules, the Ni@CCNbC nanocomposites exhibit large permittivity, enhanced dielectric loss and three Debye dipolar relaxations. An anomalous electromagnetic resonance in the Ni@CCNbC/paraffin system appears at ∼12 GHz, revealing an energy transform from the permeability to permittivity. The reflection loss value of the Ni@CCNbC/paraffin composites reaches −40.4 dB at 8.48 GHz with the absorbent thickness of 3.2 mm. Experimental results coupled with theoretical calculations by the Cole-Cole equation and the delta function standing for the electromagnetic matching degree further reveal that the good microwave absorption originates from the enhanced dielectric loss and improved electromagnetic matching.
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