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.
Nanoscale Res Lett. 2010 May 11;5(7):1170-6. doi: 10.1007/s11671-010-9621-2.
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.
一种基于多壁碳纳米管（MWCNTs）填充苯丙乳液基聚合物的高效电磁屏蔽复合材料已在水基体系中制备。MWCNTs 对介电常数有影响，这有效地提高了复合材料的电磁屏蔽效率（SE）。可以获得低电导率阈值 0.23wt%。对于 20wt%MWCNTs，获得了约 28dB 的 EMI SE。通过虚数介电常数推断出复合材料的交流电导率（σac），用于估计复合材料在 X 波段（8.2-12.4GHz）的 SE，与测量结果吻合较好。
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