Seo, Ji Hun Yang, Hyun Seong Seo, Min Ho Kim, Seon Joon Lee, Juyun Kee, Seyoung Habibpour, Saeed Lim, Sung-Nam Ahn, Wook Jun, Yun-Seok 2025-06-16T02:00:11Z 2025-06-16T02:00:11Z 2025-06-13 2025-07 0008-6223 https://pubs.kist.re.kr/handle/201004/152615 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. This results in a graphene structure with highly aligned orientations. 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. English Pergamon Press Ltd. Aligning graphene sheets in aerogel-based composites for enhanced electromagnetic interference absorption Article 10.1016/j.carbon.2025.120463 1 Carbon, v.242 Carbon 242 N scie scopus 001501940200003 2-s2.0-105005942777 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article GRAPHITE CONDUCTIVITY LIGHTWEIGHT NANOSHEETS OXIDE SHIELDING EFFECTIVENESS REDUCTION FOAM Graphene aerogel Filler alignment Absorption Electromagnetic interference shielding