Communication—Tunable Negative Permittivity of Cobalt and Epoxy Composites at 3 kHz ∼ 1 MHz Frequency Regions

Negative permittivity in percolation composites has drawn much attention owing to their potential application. This study set out to explore whether tunable negative permittivity can be realized in metal composites at 3 kHz ∼ 1 MHz frequency regions. When the content of cobalt is 80 wt%, the permitt...

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Veröffentlicht in:ECS journal of solid state science and technology 2021-12, Vol.10 (12), p.123007
Hauptverfasser: Chen, Min, Sun, Kai, Wang, Xuai, Wang, Yanmin
Format: Artikel
Sprache:eng
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Zusammenfassung:Negative permittivity in percolation composites has drawn much attention owing to their potential application. This study set out to explore whether tunable negative permittivity can be realized in metal composites at 3 kHz ∼ 1 MHz frequency regions. When the content of cobalt is 80 wt%, the permittivity turns to negative in the test band. These findings show that the Co conductive network has formed and provides large numbers of free electrons. Meanwhile, the percolation composites with negative permittivity show inductive characteristic. This research supports the idea that tunable low-frequency negative permittivity can be realized in metal composites.
ISSN:2162-8769
2162-8777
DOI:10.1149/2162-8777/ac3e45