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Tadpole-shaped (Ni, Al)/AlN nanoparticles were synthe-sized via evaporating Ni-Al alloy in a mixed atmosphere of N 2 and H 2. As a counterpart, the spherical-shaped (Ni, Al)/Al 2O 3 nanoparticles were also prepared from the same target alloy while in a mixture of Ar and H 2. The electromagnetic parameters of as-made nanoparti-cles/paraffin composites were then investigated in the frequency range of 2-18 GHz. Excellent microwave absorption can be obtained for the tadpole-shaped (Ni, Al)/AlN-paraffin composite at high frequencies and in a thin layer, which is thought to be the result of the enhanced polarization in the anisotropic tadpole-shaped nanoparticles. With the increasing of the composite thickness, the frequency of effective reflection loss shifts towards lower frequencies due to an improved impedance match and absorption.

ENHANCED POLARIZATION IN TADPOLE-SHAPED (NI, AL)/ALN NANOPARTICLES AND MICROWAVE ABSORPTION AT HIGH FREQUENCIES