Enhanced microwave absorption in Ni/polyaniline nanocomposites by dual dielectric relaxations

Ni/polyaniline (PANi) nanocomposites were prepared by chemical polymerization, and electromagnetic characteristics were then studied at 2–18GHz. The permittivity of the Ni/PANi nanocomposite presents dual dielectric relaxations with increasing content of PANi to over 15.6wt%, which is ascribed to a...

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Bibliographic Details
Published in:Applied physics letters 2008-01, Vol.92 (1)
Main Authors: Dong, X. L., Zhang, X. F., Huang, H., Zuo, F.
Format: Article
Language:English
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Summary:Ni/polyaniline (PANi) nanocomposites were prepared by chemical polymerization, and electromagnetic characteristics were then studied at 2–18GHz. The permittivity of the Ni/PANi nanocomposite presents dual dielectric relaxations with increasing content of PANi to over 15.6wt%, which is ascribed to a cooperative consequence of the core/shell interfaces and the dielectric PANi shells. Additionally, the permeability presents a strong natural resonance around 2–8GHz, which is dominant among microwave magnetic loss. The proper matching of the permittivity and the permeability contributes to enhanced microwave absorption.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2830995