Enhanced Dielectric Constant for Efficient Electromagnetic Shielding Based on Carbon-Nanotube-Added Styrene Acrylic Emulsion Based Composite
Nanoscale research letters(2010)
摘要
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.
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关键词
multiwalled carbon nanotubes,multiwalled carbon nanotubes � electromagnetic interference shielding � complex permittivitystyrene acrylic emulsion,styrene acrylic emulsion,complex permittivity,electromagnetic interference shielding,bioinformatics,biomedical research,dielectric constant,electromagnetic interference,carbon nanotube
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