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- Title
Negative permittivity behavior in Ti3AlC2-polyimide composites and the regulation mechanism.
- Authors
Wu, Han; Mu, Zuxiang; Qi, Guangyu; Zhang, Yanhui; Wang, Xuai; Xie, Peitao; Wu, Nannan; Yuan, Hua; Sui, Kunyan; Fan, Runhua; Liu, Chunzhao
- Abstract
With the rapid development of metamaterials, percolating composites with negative dielectric constant have become a research hotspot in recent years. In this work, Ti3AlC2-polyimide percolating composites were prepared by mechanical mixing and pressure forming, and their microstructure and dielectric properties were investigated in detail. By controlling the Ti3AlC2 content, an electrical percolation phenomenon appears with the formation of Ti3AlC2 conductive network. The conductive mechanism changed from hoping conduction to metal-like conduction. Above the percolation threshold (68%–72%), real permittivity changes from positive to negative and mainly due to the damped motion of the free electrons. The Drude model analysis showed that the negative permittivity resulted from the plasma-like oscillation of free electrons. The equivalent circuit analysis indicated that the generation of negative permittivity was closely related to the appearance of inductance. This work provided a simple and effective strategy for regulating negative permittivity and promoted its application.
- Subjects
DRUDE theory; DIELECTRIC properties; PERCOLATION
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 8, p10388
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-05695-y