Nano Express

Nanoscale Research Letters

, 5:1170

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

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

  • Yong LiAffiliated withTechnical Institute of Physics and Chemistry, Chinese Academy of ScienceGraduate School of the Chinese Academy of Science
  • , Changxin ChenAffiliated withNational 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 Email author 
  • , Jiang-Tao LiAffiliated withTechnical Institute of Physics and Chemistry, Chinese Academy of Science
  • , Song ZhangAffiliated with
  • , Yuwei NiAffiliated with
  • , Seng CaiAffiliated with
  • , Jie HuangAffiliated with


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 (σ ac) 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.


Multiwalled carbon nanotubes Electromagnetic interference shielding Complex permittivity Styrene acrylic emulsion