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Open Access Nano Express

Enhanced Dielectric Constant for Efficient Electromagnetic Shielding Based on Carbon-Nanotube-Added Styrene Acrylic Emulsion Based Composite

Yong Li134, Changxin Chen2*, Jiang-Tao Li1, Song Zhang4, Yuwei Ni4, Seng Cai4 and Jie Huang4

Author Affiliations

1 Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing, 100101, People’s Republic of China

2 National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, China

3 Graduate School of the Chinese Academy of Science, Beijing, 100039, People’s Republic of China

4 P.O. Box 7220, Beijing, 100072, People’s Republic of China

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Nanoscale Research Letters 2010, 5:1170-1176  doi:10.1007/s11671-010-9621-2

Published: 11 May 2010

Abstract

An efficient electromagnetic shielding composite based on multiwalled carbon nanotubes (MWCNTs)-filled styrene acrylic emulsion-based polymer has been prepared in a water-based system. The MWCNTs were demonstrated to have an effect on the dielectric constants, which effectively enhance electromagnetic shielding efficiency (SE) of the composites. A low conductivity threshold of 0.23 wt% can be obtained. An EMI SE of ~28 dB was achieved for 20 wt% MWCNTs. The AC conductivity (σac) of the composites, deduced from imaginary permittivity, was used to estimate the SE of the composites in X band (8.2–12.4 GHz), showing a good agreement with the measured results.

Keywords:
Multiwalled carbon nanotubes; Electromagnetic interference shielding; Complex permittivity; Styrene acrylic emulsion