Charge transport properties of composites of multiwalled carbon nanotube with metal catalyst and polymer: Application to electromagnetic interference shielding

H. M. Kim, K. Kim, S. J. Lee, J. Joo, H. S. Yoon, S. J. Cho, S. C. Lyu, C. J. Lee

Research output: Contribution to journalArticle

82 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)577-580
Number of pages4
JournalCurrent Applied Physics
Volume4
Issue number6
DOIs
Publication statusPublished - 2004 Nov

Keywords

  • Composite
  • Electrical conductivity
  • Electromagnetic interference shielding
  • Multiwalled carbon nanotube

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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