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Electrical Conductivity and Electromagnetic Interference Shielding of Multi-walled Carbon Nanotube Filled Polymer Composites

Published online by Cambridge University Press:  01 February 2011

Yonglai Yang ,
Mool C. Gupta ,
Kenneth L. Dudley  and
Roland W. Lawrence
Yonglai Yang
Affiliation:
Applied Research Center, Old Dominion University, Newport News, VA 23606, U.S.A.
Mool C. Gupta
Affiliation:
Applied Research Center, Old Dominion University, Newport News, VA 23606, U.S.A.
Kenneth L. Dudley
Affiliation:
Electromagnetics Research Branch, NASA Langley Research Center, Hampton, VA 23681, U.S.A.
Roland W. Lawrence
Affiliation:
Electromagnetics Research Branch, NASA Langley Research Center, Hampton, VA 23681, U.S.A.
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Abstract

Multi-walled carbon nanotube (MWNT) filled polystyrene (PS) composites were synthesized for electromagnetic interference (EMI) shielding applications. SEM images of composites showed the formation of the conducting networks through MWNTs within the PS matrix. The measured DC conductivity of composites increased with increasing MWNT loading, showing a typical percolation behavior. EMI shielding characteristics of MWNT-PS composites were investigated in the frequency range of 8.2–12.4 GHz (X-band). It was observed that the shielding effectiveness (SE) of such composite increased with the increase of MWNT loading. The SE of the composite containing 7 wt% MWNTs could reach more than 26 dB in the measured frequency region.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 858: Symposium HH – Functional Carbon Nanotubes , 2004 , HH5.3
Copyright
Copyright © Materials Research Society 2005

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