Negative Permittivity Behavior in Flexible Carbon Nanofibers- Polydimethylsiloxane Films
Haikun Wu, Haowei Sun, Fengjin Han, Peitao Xie, Yiming Zhong, Bin Quan, Yaman Zhao, Chunzhao Liu, Runhua Fan and Zhanhu Guo
1State Key Laboratory of Bio-fbers and Eco-textiles Institute of Biochemical Engineering, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, China
2 Hong Kong Branch of National Precious Metals Material Engineering Research Centre (NPMM), Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, 999077, China
3 Institute of Advanced Materials and Flexible Electronics (IAMFE), School of Chemistry and Materials Science, Nanjing University of Information Science & Technology Nanjing, 210044, China
4 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, China
5 Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee, 37996, United States
Abstract
Flexible electronic devices have recently become a research hotspot due to their potentials in different applications. However, there is a lack of studies about flexible metamaterials with negative parameters. In this work, the composite film with carbon nanofibers (CNFs) dispersed in polydimethylsiloxane (PDMS) matrix is designed to construct the flexible metamaterials with negative permittivity, showing excellent mechanical durability and flexibility. The microstructures, mechanical durability, alternating current conductivity (σac) and permittivity (ɛ′ and ɛ") were investigated and discussed in detail. A transition of conduction mechanism from jumping conduction to metal-like conduction was observed when the CNFs content was improved from 6 to 14 wt%. The CNFs-PDMS film with CNFs content of 14 wt% achieved negative permittivity over the whole frequency, which resulted from the construction of conductive CNFs network. The equivalent circuit models were used to analyze impedance (Z′ and Z′′) behavior of the composites to determine the mechanism of negative permittivity. This study will provide theoretical and technical support for the design of flexible metamaterials and promote their practical applications in wearable electronic devices.
Publication details
Received: 29 Aug 2021
Revised: 18 Nov 2021
Accepted: 20 Nov 2021
Published online: 22 Nov 2021
Article type:
Research Paper
DOI:
10.30919/es8d576
Volume:
17
Page:
113-120
Citation:
Engineered Science, 2022, 17, 113-120
Permissions:
Copyright
Number of downloads:
4178
Citation Information:
34
Description:
The flexible films are designed to achieve low-frequency-dependent negative dielectric constant with....
The flexible films are designed to achieve low-frequency-dependent negative dielectric constant with small negative value (0 < ε′ < -30).
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