DocumentCode :
802391
Title :
Hybridization of oxidized MWNT and silver powder in polyurethane matrix for electromagnetic interference shielding application
Author :
Kim, Yoon Jin ; An, Kyung Jin ; Suh, Kwang S. ; Choi, Hyung-Do ; Kwon, Jong Hwa ; Chung, Yeon-Choon ; Kim, Woo Nyon ; Lee, Ae-Kyung ; Choi, Jae-Ick ; Yoon, Ho Gyu
Author_Institution :
Dept. of Mater. Sci. & Eng., Korea Univ., Seoul, South Korea
Volume :
47
Issue :
4
fYear :
2005
Firstpage :
872
Lastpage :
879
Abstract :
Multiwalled carbon nanotubes (MWNTs) are chemically modified with respect to various different oxidative conditions, including the acid concentration, treatment time, and temperature. The conductivity of polyurethane (PU) composites filled with the MWNTs oxidized under optimal condition is measured as a function of frequency with the content of MWNTs and analyzed using percolation theory. Because the PU composites filled only with the MWNTs cannot satisfy the requirements for materials providing shielding against electromagnetic waves, conductive polymer composites are fabricated by the hybridization of MWNTs with Ag flakes. It is observed that a small amount of the MWNTs remarkably enhances the conductivity and shielding effectiveness of the MWNT/Ag flake/PU composites, by bridging the gap between the flaky Ag clusters. The electromagnetic interference shielding effectiveness of the composites can be controlled from about 60 dB to more than 80 dB at an extremely low loading level of both the MWNTs and the Ag flakes in the frequency range from 10 to 1000 MHz.
Keywords :
carbon nanotubes; composite materials; conducting materials; electromagnetic interference; electromagnetic shielding; oxidation; percolation; polymers; silver; 10 to 1000 MHz; Ag; conductive polymer composites; electromagnetic interference shielding; electromagnetic waves; oxidized multiwalled carbon nanotube; percolation theory; polyurethane matrix; silver powder; Carbon nanotubes; Chemicals; Composite materials; Conductivity measurement; Electromagnetic interference; Electromagnetic measurements; Frequency measurement; Powders; Silver; Temperature; Carbon nanotubes (CNTs); electrical properties; electromagnetic interference (EMI) shielding effectiveness; hybridization; oxidation;
fLanguage :
English
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9375
Type :
jour
DOI :
10.1109/TEMC.2005.858759
Filename :
1580757
Link To Document :
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