Enhanced dielectric constants and shielding effectiveness of, uniformly dispersed, functionalized carbon nanotube composites

Sung Hoon Park; Thielemann, Paul; Asbeck, Peter; Bandaru, Prabhakar R.
June 2009
Applied Physics Letters;6/15/2009, Vol. 94 Issue 24, p243111
Academic Journal
It was seen that composites constituted of functionalized single-walled nanotubes (SWNTs) dispersed in a reactive ethylene terpolymer (RET) matrix possess a complex dielectric permittivity an order of magnitude larger than composites composed of pristine SWNTs and two orders of magnitude larger than functionalized multiwalled nanotube-RET composites. We seek to understand such an enhancement, both in terms of uniform nanotube dispersion and through a parallel resistor-capacitor model. We subsequently show that the ac electrical conductivity is a good predictor of the electromagnetic interference shielding effectiveness of nanocomposites.


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