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Charge transport properties of composites of multiwalled carbon nanotube with metal catalyst and polymer: application to electromagnetic interference shielding
Authors:H M Kim  K Kim  S J Lee  J Joo  H S Yoon  S J Cho  S C Lyu  C J Lee
Institution:a Department of Physics, Korea University, Seoul 136-701, South Korea;b Novatems Inc., Anyang city 430-727, South Korea;c Iljin Nanotech Co., Ltd., Kangseo-Ku, Seoul 157-810, South Korea;d Department of Nanotechnology, Hanyang University, Seoul 133-791, South Korea
Abstract:We report charge transport properties such as d.c. conductivity (σDC) and its temperature dependence for composites of poly(methyl methacrylate) (PMMA) and multiwalled carbon nanotubes (MWCNTs). The MWCNTs were synthesized through chemical vapor deposition with Fe or Co as catalyst. The MWCNTs were homogeneously dispersed in PMMA matrix through sonication to prepare MWCNT–PMMA composite films. We controlled mass concentration of MWCNTs in the composites, and the thickness of MWCNT–PMMA composite films was 20–400 μm. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman spectroscopy were used to study structure and homogeneity of the composites. The σDC at room temperature of MWCNT–PMMA composites increased as mass concentration of MWCNTs increased, which followed percolation theory. Electromagnetic interference (EMI) shielding efficiency (SE) of MWCNT–PMMA composites was measured in the frequency range of 50 MHz–3.5 GHz. We observed the increase of EMI SE of MWCNT–PMMA composites with increasing the concentration of MWCNTs.
Keywords:Multiwalled carbon nanotube  Composite  Electrical conductivity  Electromagnetic interference shielding
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