Open AccessCommunication—Tunable Negative Permittivity of Cobalt and Epoxy Composites at 3 kHz ∼ 1 MHz Frequency Regions
Author(s) -
Min Chen,
Kai Sun,
Xu-ai Wang,
Yanmin Wang
Publication year - 2021
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/ac3e45
Subject(s) - permittivity , materials science , percolation (cognitive psychology) , percolation threshold , composite material , epoxy , relative permittivity , electrical conductor , frequency band , dielectric , electrical resistivity and conductivity , optoelectronics , electrical engineering , telecommunications , computer science , antenna (radio) , engineering , neuroscience , biology
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.