Enhanced polarization in tadpole-shaped (Ni, Al)/ALN nanoparticles and microwave absorption at high frequencies
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论文类型：期刊论文
发表时间：2011-01-01
发表刊物：Progress In Electromagnetics Research B
收录刊物：EI、Scopus
期号：34
页面范围：31-46
ISSN号：19376472
摘要：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.
发表时间：2011-01-01