Improved Electromagnetic Interference Shielding Properties of MWCNT-PMMA Composites Using Layered Structures

被引：189

作者：

Pande, Shailaja ^{[1
]}

Singh, B. P. ^{[1
]}

Mathur, R. B. ^{[1
]}

Dhami, T. L. ^{[1
]}

Saini, P. ^{[2
]}

Dhawan, S. K. ^{[2
]}

机构：

[1] Natl Phys Lab, Div Engn Mat, Carbon Technol Unit, New Delhi 110012, India

[2] Natl Phys Lab, Polymer & Soft Mat Sect, New Delhi 110012, India

来源：

NANOSCALE RESEARCH LETTERS | 2009年 / 4卷 / 04期

关键词：

Carbon nanotubes; Dispersion; Composites; Electrical conductivity; EMI shielding effectiveness; CARBON NANOTUBES;

D O I：

10.1007/s11671-008-9246-x

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Electromagnetic interference (EMI) shielding effectiveness (SE) of multi-walled carbon nanotubes-polymethyl methacrylate (MWCNT-PMMA) composites prepared by two different techniques was measured. EMI SE up to 40 dB in the frequency range 8.2-12.4 GHz (X-band) was achieved by stacking seven layers of 0.3-mm thick MWCNT-PMMA composite films compared with 30 dB achieved by stacking two layers of 1.1-mm thick MWCNT-PMMA bulk composite. The characteristic EMI SE graphs of the composites and the mechanism of shielding have been discussed. SE in this frequency range is found to be dominated by absorption. The mechanical properties (tensile, flexural strength and modulus) of the composites were found to be comparable or better than the pure polymer. The studies therefore show that the composite can be used as structurally strong EMI shielding material.

引用

页码：327 / 334

页数：8

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