Journal
NANOSCALE RESEARCH LETTERS
Volume 5, Issue 7, Pages 1170-1176Publisher
SPRINGEROPEN
DOI: 10.1007/s11671-010-9621-2
Keywords
Multiwalled carbon nanotubes; Electromagnetic interference shielding; Complex permittivity; Styrene acrylic emulsion
Funding
- Specialized Research Fund for the Doctoral Program of Higher Education parallel toSRFDP) [200802481028]
- Shanghai-Applied Materials Research and Development Fund [08520741500]
- National Natural Science Foundation of China [60807008, 50730008]
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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 similar to 28 dB was achieved for 20 wt% MWCNTs. The AC conductivity (sigma(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.
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