Abstract
Tadpole-shaped (Ni, Al)/AlN nanoparticles were synthe- sized via evaporating Ni-Al alloy in a mixed atmosphere of N2 and H2. As a counterpart, the spherical-shaped (Ni, Al)/Al2O3 nanoparticles were also prepared from the same target alloy while in a mixture of Ar and H2. The electromagnetic parameters of as-made nanoparti- cles/para-n composites were then investigated in the frequency range of 2{18GHz. Excellent microwave absorption can be obtained for the tadpole-shaped (Ni, Al)/AlN-para-n 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 efiective re∞ec- tion loss shifts towards lower frequencies due to an improved impedance match and absorption.
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