TY - JOUR
T1 - Charge transport properties of composites of multiwalled carbon nanotube with metal catalyst and polymer
T2 - Application to electromagnetic interference shielding
AU - Kim, H. M.
AU - Kim, K.
AU - Lee, S. J.
AU - Joo, J.
AU - Yoon, H. S.
AU - Cho, S. J.
AU - Lyu, S. C.
AU - Lee, C. J.
N1 - Funding Information:
This work was supported in part by the IMT-2000 Project, Ministry of Commerce, Industry, and Energy, Korea and the BK-21.
PY - 2004/11
Y1 - 2004/11
N2 - 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.
AB - 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.
KW - Composite
KW - Electrical conductivity
KW - Electromagnetic interference shielding
KW - Multiwalled carbon nanotube
UR - http://www.scopus.com/inward/record.url?scp=5144234290&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=5144234290&partnerID=8YFLogxK
U2 - 10.1016/j.cap.2004.01.022
DO - 10.1016/j.cap.2004.01.022
M3 - Article
AN - SCOPUS:5144234290
SN - 1567-1739
VL - 4
SP - 577
EP - 580
JO - Current Applied Physics
JF - Current Applied Physics
IS - 6
ER -