Effect of Electromagnetic Shielding on Electron Beam-Cured Multi-Walled Carbon Nanotubes/Epoxy Composites

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In this study, the electromagnetic interference shielding properties of multi-walled carbon nanotubes/epoxy composites were investigated in the frequency region from 1∼8 GHz (L, S and C bands). Electromagnetic shielding samples were fabricated using an electron beam. The electromagnetic shielding properties of these absorber specimens were measured by a network analyzer (Agilent, 4901A), and their fracture behavior was analyzed by scanning electron microscopy. It was found that the saturation conductance depends on the fraction of the multi-walled carbon nanotubes in the composite, which affects the initial permittivity. These results show that the dielectric loss is a dominant factor in the L, S, and C bands, and the resonance frequency of the composite increased with the increasing fraction of multi-walled carbon nanotubes. Finally, the reflection loss was calculated from the permeability and permittivity of these composites. Composite with 10 wt% multi-walled carbon nanotubes and 1.5 mm thickness showed a reflection loss below −20 dB in the L, S, and C bands. Therefore, it is believed that thin multi-walled carbon nanotubes/epoxy composites may be good candidates for microwave absorption applications.
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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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