[Nano-Micro Letters] Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures
作者：Lei Wang, Zhonglei Ma, Hua Qiu*, Yali Zhang, Ze Yu, Junwei Gu*
關(guān)鍵字：Electromagnetic interference shielding
論文來源：期刊
具體來源：Nano-Micro Letters
發(fā)表時(shí)間：2022年
Lei Wang, Zhonglei Ma, Hua Qiu*, Yali Zhang, Ze Yu, Junwei Gu*. Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures. Nano-Micro Letters, 2022, 14: 224. 2021IF=23.655.
https://doi.org/10.1007/s40820-022-00949-8
High?efficiency electromagnetic interference (EMI) shielding materials is of great importance for electronic equipment reliability, information security and human health. In this work, bidirectional aligned Ti3C2Tx@Fe3O4/CNF aerogels (BTFCA) were firstly assembled by bidirectional freezing and freeze-drying technique, and the BTFCA/epoxy nanocomposites with long-range aligned lamellar structures were then prepared by vacuum-assisted impregnation of epoxy resins. Benefitting from the successful construction of bidirectional aligned three-dimensional conductive networks and electromagnetic synergistic effect, when the mass fraction of Ti3C2Tx and Fe3O4 are 2.96 wt% and 1.48 wt%, BTFCA/epoxy nanocomposites show outstanding EMI shielding effectiveness of 79 dB, about 10 times of that of blended Ti3C2Tx@Fe3O4/epoxy (8 dB) nanocomposites with the same loadings of Ti3C2Tx and Fe3O4. Meantime, the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability (Theat-resistance index of 198.7oC) and mechanical properties (storage modulus of 9902.1 MPa, Young''s modulus of 4.51 GPa and hardness of 0.34 GPa).
高性能電磁屏蔽材料對電子設(shè)備的可靠性、信息安全和人體健康具有重要意義。本文通過“雙向冷凍-冷凍干燥-熱還原”技術(shù)制備雙向有序Ti3C2Tx@Fe3O4/CNF氣凝膠（BTFCA），再經(jīng)真空浸漬環(huán)氧樹脂制備出具有長程有序?qū)訝罱Y(jié)構(gòu)的BTFCA/環(huán)氧樹脂納米復(fù)合材料。得益于雙向有序3D導(dǎo)電網(wǎng)絡(luò)和電磁復(fù)合體系的構(gòu)建，當(dāng)Ti3C2Tx和Fe3O4質(zhì)量分?jǐn)?shù)分別為2.96 wt%和1.48 wt%時(shí)，BTFCA/環(huán)氧樹脂納米復(fù)合材料展現(xiàn)出優(yōu)異的電磁屏蔽性能，其屏蔽效能（EMI SE）高達(dá)79 dB，是相同Ti3C2Tx和Fe3O4用量下共混Ti3C2Tx@Fe3O4/環(huán)氧樹脂納米復(fù)合材料EMI SE（8 dB）的9.9倍。BTFCA/環(huán)氧樹脂納米復(fù)合材料還具有優(yōu)異的熱穩(wěn)定性（耐熱指數(shù)=198.7oC）和力學(xué)性能（儲能模量=9902.1 MPa、楊氏模量=4.51 GPa、硬度=0.34 GPa）。