Issue 9, 2013
From the journal:

Journal of Materials Chemistry C

Improved dielectric properties and highly efficient and broadened bandwidth electromagnetic attenuation of thickness-decreased carbon nanosheet/wax composites

Wei-Li Song,*abc   Mao-Sheng Cao,*b   Ming-Ming Lu,b   Jia Liu,b   Jie Yuanb  and  Li-Zhen Fan*a  

* Corresponding authors

a Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, P. R. China
E-mail: dexterquest@gmail.com, caomaosheng@bit.edu.cn, fanlizhen@ustb.edu.cn
Fax: +86 10 6891 4062
Tel: +86 10 6891 4062

b School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, P. R. China

c Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, USA

Abstract

Carbon-based composites with various potential applications based on their unique properties are highly attractive. Lightweight electromagnetic attenuation composites embedded with carbon materials, specifically carbon nanosheets or graphene, are considered to offer promising attenuation performance due to their excellent electrical properties. Generally, graphene and carbon nanosheets are mostly achieved via chemical oxidation and subsequent reduction of commercial graphite, and the recovery of the electrical properties for the resulting products substantially depends on the reducing approaches. In this work, a direct chemical exfoliation approach has been applied to fabricate carbon nanosheets without sacrificing electrical properties. Thickness effects of the carbon nanosheets on the percolation threshold were investigated in the ethylene-vinyl acetate-based composites. These polymeric composites filled with thickness-decreased carbon nanosheets were found to exhibit much lower percolation threshold compared to those filled with unexfoliated ones. Thickness-dependent dielectric properties and electromagnetic attenuation were investigated via a direct comparison between unexfoliated and thickness-decreased carbon nanosheets along with corresponding paraffin wax-based composites. The enhanced complex permittivity and efficient electromagnetic attenuation coupled with broadened attenuation bandwidth were observed in the wax-based composites filled with thickness-decreased carbon nanosheets, and the related mechanism was discussed.

Graphical abstract: Improved dielectric properties and highly efficient and broadened bandwidth electromagnetic attenuation of thickness-decreased carbon nanosheet/wax composites

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Article information

DOI
https://doi.org/10.1039/C2TC00494A
Article type
Paper
Submitted
25 Oct 2012
Accepted
18 Dec 2012
First published
21 Dec 2012

J. Mater. Chem. C, 2013,1, 1846-1854

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Improved dielectric properties and highly efficient and broadened bandwidth electromagnetic attenuation of thickness-decreased carbon nanosheet/wax composites

W. Song, M. Cao, M. Lu, J. Liu, J. Yuan and L. Fan, J. Mater. Chem. C, 2013, 1, 1846 DOI: 10.1039/C2TC00494A

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