Abstract
A simple and facile method has been provided to develop novel core-heteroshell electromagnetic (EM) wave absorbers via selenylation of FeNi3 nanoparticles. Core-heteroshell composites containing multiple phases including the FeNi3, NiFe2O4 and NiSex can been obtained with increased surface gradient of Se with the growth mechanisms revealed. Not only synergistic effects of magnetic and dielectric attenuation have been introduced, the multiple components also give rise to tunable impedance and enhanced interfacial polarization for improved EM wave absorbing performance. Such effective one-step route may be extendable to achieve core-heteroshell structure with multiple components for applications in other fields including energy, catalysis and sensing.
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