Journal
ORGANIC ELECTRONICS
Volume 14, Issue 6, Pages 1531-1537Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2013.02.029
Keywords
Carbon nanotube; Polymer composites; Three-roll milling; Electromagnetic interference shielding; Dielectric
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We report superior electromagnetic interference shielding and dielectric properties of carbon nanotube (CNT) composites achieved through the use of high aspect ratio CNTs and three-roll milling. Highly entangled CNTs are separated and then evenly dispersed within the polymer matrix using three horizontally positioned rotating rolls that apply a strong shear force to the composite. Very high aspect ratio CNTs combined with an effective fabrication process result in a low percolation threshold (similar to 0.06 vol%) and excellent electromagnetic interference (EMI) shielding efficiency (SE). The achieved SE is one of highest ever reported for the given CNT loading and measurement conditions. A model consisting of a network of resistors and capacitors formed within the nanocomposite was used to describe the microwave properties of the multi-walled carbon nanotubes/polydimethylsiloxane composites (MWNT/PDMS). Enhancement of this network is attained through the use of high aspect ratio CNTs and a fabrication process that evenly disperses and randomly orients this filler within the PDMS. (C) 2013 Elsevier B. V. All rights reserved.
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