Thin-Film Layering of Conductive Polymer Composite 2-wt% Multiwalled Carbon Nanotube (MWCNT)/Poly (3,4-ethylenedioxythiophene): Poly (Styrenesulfonic Acid) (PEDOT:PSS) for Electromagnetic Interference Shielding

Report No. ARL-TR-8777
Authors: Eugene Zakar, Theodore Anthony, Madan Dubey
Date/Pages: September 2019; 17 pages
Abstract: We investigated the cumulative effects of layering a thin film of conductive polymer composite 2-wt% multiwall carbon nanotube filler in poly (3,4-ethylenedioxythiophene):poly (styrenesulfonic acid) on a transparent and flexible Mylar substrate for application to electromagnetic interference (EMI) shielding. The optical transmittance of spin-coated composite layers is 90%, 45%, and 20% with a thickness of 0.05, 0.15, and 0.45 μm, respectively. However, when the same composition of composite formula is drop casted, the film thickness increases tenfold and the optical transmittance drops to 0%. This study also shows that the cumulative effects of composite layering are additive, but the electrical properties do not scale the same way. A significant increase in the EMI shielding effectiveness in the Ku-band is mainly attributed to the enhanced electrical conductivity of the composite layering.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2019