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코어-쉘 구조를 갖는 BaTiO<sub>3</sub>@Fe 나노섬유의 합성 및 전자파 흡수 특성
이영인,장대환,성기훈,이규만,좌용호,Lee, Young-In,Jang, Dae-Hwan,Sung, Ki-Hoon,Lee, Kyuman,Choa, Yong-Ho 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.1
$BaTiO_3$-coated Fe nanofibers are synthesized via a three-step process. ${\alpha}-Fe_2O_3$ nanofibers with an average diameter of approximately 200 nm are first prepared using an electrospinning process followed by a calcination step. The $BaTiO_3$ coating layer on the nanofiber is formed by a sol-gel process, and a thermal reduction process is then applied to the core-shell nanofiber to selectively reduce the ${\alpha}-Fe_2O_3$ to Fe. The thickness of the $BaTiO_3$ shell is controlled by varying the reaction time. To evaluate the electromagnetic (EM) wave-absorbing abilities of the $BaTiO_3@Fe$ nanofiber, epoxy-based composites containing the nanofibers are fabricated. The composites show excellent EM wave absorption properties where the power loss increases to the high frequency region without any degradation. Our results demonstrate that the $BaTiO_3@Fe$ nanofibers obtained in this work are attractive candidates for electromagnetic wave absorption applications.