Open AccessCommunication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies
Author(s) -
Yuyan Li,
Huan Ye,
Yunpeng Qu,
Zongxiang Wang,
Kai Sun
Publication year - 2022
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/ac4bac
Subject(s) - permittivity , materials science , relative permittivity , percolation threshold , carbon nanotube , condensed matter physics , percolation (cognitive psychology) , drude model , graphene , optoelectronics , electrical resistivity and conductivity , composite material , nanotechnology , dielectric , physics , neuroscience , biology , quantum mechanics
Three-dimensional (3D) carbon networks composed of graphene (GR) and carbon nanotube (CNT) were constructed in copper calcium titanate (CCTO) in order to realize negative permittivity behavior. The results show that negative permittivity can be obtained at kHz frequencies above percolation threshold when 3D carbon networks are successfully constructed. Negative permittivity originates from the low-frequency plasmonic state which is explained by Drude model. The magnitude of negative permittivity was tuned between 10 5 and 10 6 which significantly correlates with concentration of free carriers. Moreover, the reactance spectra clarify the inductive character of negative permittivity materials.