[3PS-167]
Aligning graphene sheets in aerogel-based composites for enhanced electromagnetic interference absorption
발표자서지훈 (부경대학교)
연구책임자전윤석 (부경대학교)
Abstract
This study investigates graphene aerogel-based polydimethylsiloxane (PDMS) composites designed to improve electromagnetic interference (EMI) absorption. These composites are fabricated by infiltrating PDMS into graphene aerogel produced by uni-directional freezing and thermal reduction. The composites in longitudinal directions exhibit a shielding effectiveness by absorption (SEA) of 8.6 dB/mm and a shielding effectiveness by total (SET) of 11.5 dB/mm in 8.2–12.4 (X-band) frequency range. On the other hand, the transverse direction shows a lower EMI shielding capability with a SEA of 4.5 dB/mm and a SET of 6.7 dB/mm. These are attributed to the fact that the aligned orientation of the fillers increased the internal multiple scattering of incident electromagnetic wave, which increases the propagation path and energy attenuation. These results demonstrate that controlling the filler orientation can significantly increase the EMI performances of graphene/PDMS composites.